3830-A2-GB91
You have accessed an
older version of a
Paradyne product
document.
Paradyne is no longer a
subsidiary of AT&T. Any
reference to AT&T
Paradyne is amended to
read Paradyne
Corporation.
AREA CODE CHANGE
Please note that the area
code for Paradyne
Corporation in Largo,
Florida has changed from
813 to 727.
For any Paradyne
telephone number that
appears in this manual
with an 813 area code,
dial 727 instead.
COMSPHERE
3800 Series Modems
Model 3830
User’s Guide
Document No. 3830-A2-GB91
Technical Update Memos Incorporated:
3830-A2-GB91-10
Paradyne
Printed on recycled paper
June 1994
COMSPHERE 3800 Series Modems – Model 3830
COMSPHERE
3800 Series Modems
Model 3830
User’s Guide
3830-A2-GB91-10
2nd Edition (June 1994)
Changes and enhancements to the product and to the information
herein will be documented and issued as a new release or a limited
revision of this manual.
A Reader’s Comments form is provided at the front of this
publication and your comments are appreciated. If the form has been
removed, address comments to AT&T Paradyne Corporation,
Technical Publications, 8545 126th Ave. N., P.O. Box 2826, Largo,
Florida, U.S.A. 34649-2826. AT&T Paradyne may use or distribute
any of the information supplied, as appropriate, without incurring any
obligation whatsoever.
For the Model 3830 standalone modem, the Universal Service Order
Code (USOC) for Permissive mode is RJ11C and for Programmable
mode is RJ41S or RJ45S. The Canadian equivalent to the USOC is
CA11 for RJ11C, and CA41A and CA45A for RJ41S and RJ45S,
respectively.
FCC Registration number:
Ringer Equivalence number (REN):
Canadian Certification number:
Canadian DOC Load number:
COPYRIGHT
(See label on modem)
0.8B
(See label on modem)
7
E 1994 AT&T Paradyne Corporation. All rights reserved.
This publication is protected by federal copyright law. No part of this publication may be copied or distributed,
transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language in
any form or by any means, electronic, mechanical, magnetic, manual or otherwise, or disclosed to third parties
without the express written permission of AT&T Paradyne Corporation, 8545 126th Avenue North, P.O. Box
2826, Largo, Florida 34649-2826.
AT&T Paradyne Corporation makes no representation or warranties with respect to the contents hereof and
specifically disclaims any implied warranties of merchantability or fitness for a particular purpose. Further,
AT&T Paradyne Corporation reserves the right to revise this publication and to make changes from time to
time in the contents hereof without obligation of AT&T Paradyne Corporation to notify any person of such
revision or changes.
A
June 1994
3830-A2-GB91-10
Trademarks
Trademarks
AT is a trademark of Hayes Microcomputer Products, Inc.
COMSPHERE is a registered trademark of AT&T.
DATAKIT is a trademark of AT&T.
Enhanced Throughput Cellular and ETC are trademarks of AT&T.
IBM is a registered trademark of International Business Machines
Corporation.
MNP is a registered trademark of Microcom, Inc.
UNIX is a registered trademark of AT&T.
3830-A2-GB91-10
June 1994
B
COMSPHERE 3800 Series Modems – Model 3830
Important Safety Instructions
1. Read and follow all warning notices and instructions marked
on the product or included in the manual.
2. This product is intended to be used with a three-wire
grounding type plug – a plug which has a grounding pin.
This is a safety feature. Equipment grounding is vital to
ensure safe operation. Do not defeat the purpose of the
grounding type plug by modifying the plug or using an
adaptor.
Prior to installation, use an outlet tester or a voltmeter to
check the ac receptacle for the presence of earth ground. If
the receptacle is not properly grounded, the installation
must not continue until a qualified electrician has corrected
the problem.
If a three-wire grounding type power source is not available,
consult a qualified electrician to determine another method
of grounding the equipment.
3. Slots and openings in the cabinet are provided for
ventilation. To ensure reliable operation of the product and to
protect it from overheating, these slots and openings must
not be blocked or covered.
4. Do not allow anything to rest on the power cord and do not
locate the product where persons will walk on the power
cord.
5. Do not attempt to service this product yourself, as opening
or removing covers may expose you to dangerous high
voltage points or other risks. Refer all servicing to qualified
service personnel.
6. General purpose cables are provided with this product.
Special cables, which may be required by the regulatory
inspection authority for the installation site, are the
responsibility of the customer.
7. When installed in the final configuration, the product must
comply with the applicable Safety Standards and regulatory
requirements of the country in which it is installed. If
necessary, consult with the appropriate regulatory agencies
and inspection authorities to ensure compliance.
C
June 1994
3830-A2-GB91-10
Safety Instructions
8. A rare phenomenon can create a voltage potential between
the earth grounds of two or more buildings. If products
installed in separate buildings are interconnected, the
voltage potential may cause a hazardous condition. Consult
a qualified electrical consultant to determine whether or not
this phenomenon exists and, if necessary, implement
corrective action prior to interconnecting the products.
In addition, if the equipment is to be used with
telecommunications circuits, take the following precautions:
– Never install telephone wiring during a lightning storm.
– Never install telephone jacks in wet locations unless the
jack is specifically designed for wet locations.
– Never touch uninsulated telephone wires or terminals
unless the telephone line has been disconnected at the
network interface.
– Use caution when installing or modifying telephone lines.
– Avoid using a telephone (other than a cordless type)
during an electrical storm. There may be a remote risk of
electric shock from lightning.
– Do not use the telephone to report a gas leak in the
vicinity of the leak.
3830-A2-GB91-10
June 1994
D
COMSPHERE 3800 Series Modems – Model 3830
Notices
" " " " " " ! " "" ! E
June 1994
3830-A2-GB91-10
Safety Instructions
Government Requirements and Equipment Return
Certain governments require that instructions pertaining to modem
connection to the public switched telephone network be included in
the installation and operation manual. Specific instructions are listed
in the following sections.
United States
Notice To Users Of The Public Switched Telephone Network
1. This equipment complies with Part 68 of the FCC rules. On the
equipment is a label that contains, among other information, the
FCC registration number and ringer equivalence number (REN)
for this equipment. The label is located on the bottom of the
Model 3830 modem.
2. Page A of this manual contains the Universal Service Order
Codes (USOC) associated with the services on which the
equipment is to be connected.
3. The Ringer Equivalence (REN) is used to determine the quantity
of devices which may be connected to the telephone line.
Excessive RENs on the telephone line may result in the devices
not ringing in response to an incoming call. In most, but not all
areas, the sum of the RENs should not exceed five (5.0). To be
certain of the number of devices that may be connected to the
line, as determined by the total RENs, contact the telephone
company to determine the maximum RENs for the calling area.
4. If the Model 3830 modem causes harm to the telephone network,
the telephone company will notify you in advance that temporary
discontinuance of service may be required. But if advance notice
is not practical, the telephone company will notify the customer
as soon as possible. Also, you will be advised of your right to file
a complaint with the FCC if you believe it is necessary.
5. The telephone company may make changes in its facilities,
equipment, operations, or procedures that could affect the
operation of the equipment. If this happens, the telephone
company will provide advance notice in order for you to make
the necessary modifications in order to maintain uninterrupted
service.
3830-A2-GB91-10
June 1994
F
COMSPHERE 3800 Series Modems – Model 3830
6. If your Model 3830 modem is in need of repair, you can either
call your local AT&T Paradyne Customer Support representative
or return the equipment to the AT&T Paradyne Repair Center.
Your modem has a two-year warranty.
To return the equipment, prepare a memo and supply the
following information:
Your Company
Company Address
Contact Name
Contact’s Phone Number
Billing Address
Purchase Order Number Associated with the equipment
Brief Description of the Symptoms
Package the equipment carefully for shipping, including the
memo containing the necessary information. Mark the package to
the attention of the Repair Center, and send the package to the
address below:
AT&T Paradyne
8550 Ulmerton Road
Largo, Florida 34641
Attn: Repair Center, Building B
If you have any questions regarding this procedure, call the
Repair Center:
(813) 530-2268 or (800) 772-7691
If the trouble is causing harm to the telephone network, the
telephone company may request that you remove the equipment
from the network until the problem is resolved.
7. The user is not authorized to repair or modify the equipment
beyond replacing the ac line fuse. Refer to the installation section
of this manual for more information.
8. This equipment cannot be used on public coin service provided
by the telephone company. Connection to Party Line Service is
subject to state tariffs. (Contact the state public utility
commission, public service commission or corporation
commission for information.)
G
June 1994
3830-A2-GB91-10
Safety Instructions
9. The Telephone Consumer Protection Act of 1991 makes it
unlawful for any person to use a computer or other electronic
device to send any message via a telephone fax machine unless
such a message clearly contains, in a margin at the top or bottom
of each transmitted page, or on the first page of the transmission,
the date and time it is sent, and an identification of the business,
or other entity, or other individual sending the message, and the
telephone number of such business, or other entity, or individual.
In order to program this information, follow the steps outlined in
the manual supplied with your fax software.
10. An FCC compliant telephone cord with modular plugs may be
provided with this equipment. This equipment is designed to be
connected to the telephone network or premises wiring using a
compatible modular jack which is Part 68 compliant.
Canada
Notice To The Users Of The Canadian Public
Switched Telephone Network
The Canadian Department of Communications label identifies
certified equipment. This certification means that the equipment
meets certain telecommunications network protective, operational and
safety requirements. The Department does not guarantee the
equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is
permissible to be connected to the facilities of the local
telecommunications company. The equipment must also be installed
using an acceptable method of connection. In some cases, the
company’s inside wiring associated with a single line individual
service may be extended by means of a certified connector assembly
(telephone extension cord). The customer should be aware that
compliance with the above conditions may not prevent degradation of
service in some situations.
Repairs to certified equipment should be made by an authorized
Canadian maintenance facility designated by the supplier. Any repairs
or alterations made by the user to this equipment, or equipment
malfunctions, may give the telecommunications company cause to
request the user to disconnect the equipment.
3830-A2-GB91-10
June 1994
H
COMSPHERE 3800 Series Modems – Model 3830
Users should ensure for their own protection that the electrical ground
connections of the power utility, telephone line and internal metallic
water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.
CAUTION
Users should not attempt to make such
connections themselves, but should contact
the appropriate electric inspection authority,
or electrician, as appropriate.
The Load Number for this equipment is listed on page A of this
manual. The Load Number (LN) assigned to each terminal device
denotes the percentage of the total load to be connected to a telephone
loop which is used by the device to prevent overloading. The
termination on a loop may consist of any combination of devices
subject only to the requirement that the total of the Load Numbers of
all devices does not exceed 100.
If your equipment is in need of repair, contact the AT&T Paradyne
Regional Sales Office nearest you. If you are unable to contact a
regional sales office, arrange to have your equipment repaired by
contacting Inventory Control Office, 100 York Blvd., Suite 200,
Richmond Hill, Ontario L4B 1J8, telephone (416) 494-0453. Your
modem has a two-year warranty.
I
June 1994
3830-A2-GB91-10
Preface
Objectives and Reader Assumptions
This manual describes how to install and operate the Model 3830
standalone modem. This manual assumes that you have a basic
understanding of dial modems and their operation.
How to Use this Manual
Chapter 1 provides information about the 3830 modem’s hardware
and software features, including the front panel and status indicators.
Chapter 2 provides instructions for installing the modem, selecting
factory configuration options, recovering the ability to use AT
commands, and using AT command initialization strings.
t
Chapter 3 provides general information about fax modem operation.
Chapter 4 provides instructions for displaying and changing AT
commands and S-Registers. These commands control all aspects of
the modem’s operation.
Appendix A provides instructions for performing diagnostic tests
when data communications problems occur.
Appendix B lists the technical specifications of the 3830 modem.
Appendix C provides EIA RS-232 pin assignments.
Appendix D provides V.25 bis dialing information.
The Glossary provides a description of terms used throughout this
manual.
3830-A2-GB91-10
June 1994
i
COMSPHERE 3800 Series Modems – Model 3830
Related Documents
3810-A2-GB91 COMSPHERE 3800 Series Modems, Models 3810,
3811, and 3820, User’s Guide
6700-A2-GY31 COMSPHERE 6700 Series Network Management
System User’s Guide
Ordering Information
To order AT&T Paradyne documentation, please call 1-800-545-2354.
ii
June 1994
3830-A2-GB91-10
Table of Contents
1. Introduction
Overview Features COMSPHERE Model 3830 Modem Front Panel
and Status Indicators 2. Model 3830 Modem Installation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 Modem Package . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTE Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dial-Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-Wire Leased-Line Connection . . . . . . . . . . . . . . . . . . . . . .
Telephone Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Power Transformer Connection . . . . . . . . . . . . . . . . . . .
Communications Software Installation . . . . . . . . . . . . . . . . .
Modem Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Factory Configuration Options . . . . . . . . . . . . . . .
Recovering AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-1
2-2
2-4
2-4
2-5
2-5
2-5
2-6
2-6
2-7
2-9
2-11
3. Fax Operation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Fax Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3830-A2-GB91-10
June 1994
iii
COMSPHERE 3800 Series Modems – Model 3830
4. AT Command Set and S-Registers
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Command List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
4-1
4-3
4-6
4-28
A
B
C
D
A-1
B-1
C-1
D-1
Appendices
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . .
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CCITT V.25 bis Dialing Commands and Response . . .
Glossary
Index
iv
June 1994
3830-A2-GB91-10
Table of Contents
List of Figures
Figures
1-1
2-1
C-1
Page
Model 3830 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Model 3830 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Wiring Diagram – 8-Position to 6-Position
Conversion Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
3830-A2-GB91-10
June 1994
v
COMSPHERE 3800 Series Modems – Model 3830
List of Tables
Tables
Page
1-1
4-1
4-2
4-3
A-1
A-2
A-3
A-4
A-5
B-1
C-1
C-2
D-1
D-2
1-4
4-4
4-7
4-29
A-2
A-3
A-4
A-7
A-8
B-1
C-1
C-5
D-8
D-9
vi
Model 3830 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Result Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem Health . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem – DTE Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem – VF Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Online Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leased-Line Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EIA-232-D Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . .
VF Connector Pin Assignments for Leased Lines . . . . . . . . . . .
V.25 bis Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.25 bis Response Messages . . . . . . . . . . . . . . . . . . . . . . . . . . .
June 1994
3830-A2-GB91-10
Introduction
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE Model 3830 Modem Front Panel and Status Indicators . . . . .
Status Indicators (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
1-3
1-3
Overview
The Model 3830 modem is a member of the COMSPHEREr 3800
Series Modem product line. The Model 3830 modem is a high-speed
dial modem that offers reliable asynchronous and synchronous
operation over dial- or two-wire leased-line networks. The Model
3830’s software defineability allows you to add enhancements and
new features as they become available, with no further investment in
hardware, no on-site personnel, and minimal downtime.
High-speed data transfer and reliable throughput at data rates as high
as 19,200 bps (V.32terbo) over dial lines is guaranteed by employing
the latest techniques in CCITT V.42 bis/MNPr Class 5 data
compression and CCITT V.42/MNP error correction. In addition to
fast line speeds, the modem can send data to the DTE at speeds as
high as 115,200 bps.
The Model 3830 modem is extremely versatile when used in modem
pooling environments; it allows multiple users to temporarily
customize settings in the Model 3830, thereby permitting
communication with the calling modem. Upon disconnection, the
Model 3830 modem falls back to its original configuration settings
and resumes normal operation.
The modem’s compatibility with a number of dialing methods and
protocols, such as asynchronous ATt commands and CCITT V.25 bis
dialing, permits the Model 3830 to be used in a variety of applications
and environments while also allowing control over modem
configuration, dialing, and diagnostics. The modem offers two preset
factory configurations containing the most often used modem
settings. These factory presets provide quick configuration for any
asynchronous or UNIXr hardware-based dial environment.
3830-A2-GB91-10
June 1994
1-1
COMSPHERE 3800 Series Modems – Model 3830
Features
The 3830 modem has a wide variety of features, including:
1-2
•
Dial-Line Modulations: V.32terbo (19,200 and 16,800 bps),
CCITT V.32 bis (14,400, 12,000, 9600, 7200, and 4800 bps),
V.32 (9600 and 4800 bps), V.22 bis (2400 bps),
V.22 (1200 bps), V.21 (300 bps), Bell 212A (1200 bps), and
Bell 103J (300 bps).
•
Two-wire Leased-Line Modulations: V.32terbo (19,200 and
16,800 bps), V.32 bis (14,400, 12,000, 9600, 7200, and
4800 bps), and V.32 (9600 and 4800 bps).
•
Optional Fax modulations: CCITT V.17 (14,400, 12,000,
9600, 7200 bps), CCITT V.29 (9600 and 7200 bps), and
CCITT V.27 ter (4800 and 2400 bps).
•
Convenient migration to new or optional features through
software downloading.
•
CCITT V.42 bis and MNP Class 5 data compression.
•
Virtual error-free data integrity with CCITT V.42 and MNP
Level 4 error control.
•
Asynchronous dial DTE data rates from 300 bps – 115,200 bps.
•
A unique AT&T Paradyne modem pooling feature that
preserves the answering modem’s permanent configuration, but
allows multiple users to temporarily adapt parameters for
individual requirements.
•
Enhanced Throughput Cellular , which improves reliability
and speed over cellular links.
•
Compatibility with the industry de facto standard AT
Command set.
•
High-speed transmission using asynchronous, synchronous, or
UNIX devices over full- or half-duplex dial networks or 2-wire
leased lines.
•
Support as a remote device by the COMSPHERE 6700 Series
Network Management System.
t
June 1994
3830-A2-GB91-10
1. Introduction
•
Compatibility with COMSPHERE 3800 Series modems’
Remote Access Mode, which allows users of 3810, 3811, and
3820 modems to view the configuration options of a 3830
modem from their front panel LCD displays.
•
Storage of up to 10 telephone numbers to directory locations.
•
Two factory-defined configurations and two user-defined
configuration areas.
COMSPHERE Model 3830 Modem Front Panel
and Status Indicators
The front panel of the Model 3830 modem is equipped with a
speaker and 13 LEDs (status indicators) that monitor modem
activity (Figure 1-1).
Figure 1-1. Model 3830 Front Panel
Status Indicators (LEDs)
The Model 3830’s status indicators continuously provide information
on the modem’s operating condition. Table 1-1 lists the label, color
and functionality of each status indicator.
3830-A2-GB91-10
June 1994
1-3
COMSPHERE 3800 Series Modems – Model 3830
Table 1-1
(1 of 2)
Model 3830 LEDs
Label
Color
Indicates
PWR
green
Power
ON. Power is on and the modem is capable of
operating.
ALRM
red
OH
green
Alarm Flashing
The modem has detected an internal
malfunction.
Off-Hook
ON. The modem is off-hook.
OFF. The modem is on-hook.
DTR/108
green
Data Terminal Ready
The DTE has turned ON DTR or the modem
has forced DTR ON.
RTS/105
green
Request-to-Send
The DTE has data to send to the modem.
CTS/106
green
Clear-to-Send
The modem is ready to receive data from the
DTE.
TXD/103
green
Transmit Data
The modem is receiving data from the DTE to
transmit.
LSD/109
green
Line Signal Detect
The modem has detected a valid carrier
signal and is capable of transferring data to
the DTE.
RXD/104
green
Receive Data
Data is being transferred to the DTE.
SQ
yellow
Signal Quality
The receive telephone line signal is degraded.
EC
green
Error Control
Modem is in Error Control mode.
1-4
June 1994
3830-A2-GB91-10
1. Introduction
Table 1-1
(2 of 2)
Model 3830 LEDs
Label
RATE
Color
yellow
Indicates
Rate
ON. The modem is connected at a data rate
lower than the data rate it is configured for.
OFF. The modem is connected at its
configured data rate.
AT
yellow
AT Command Set
ON. The AT command set is disabled.
OFF. The AT command set is enabled.
Slow Flash. The modem will not respond to all
AT commands due to the setting of the AT
Command Mode configuration option (see
S84 in Chapter 4). Or, the modem has been
configured to reload settings from Active
(Saved) to Active (Operating) upon a
disconnect.
3830-A2-GB91-10
June 1994
1-5
COMSPHERE 3800 Series Modems – Model 3830
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1-6
June 1994
3830-A2-GB91-10
Model 3830 Modem
Installation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 Modem Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer-Supplied Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3830 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTE Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dial-Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-Wire Leased-Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Telephone Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Power Transformer Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communications Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Factory Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovering AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.25 bis Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Leased-Line Applications . . . . . . . . . . . . . . . . . . . . . . . . . .
AT&T Exclusive Dialing for DATAKIT Applications . . . . . . . . . . . . . . .
2
2-1
2-1
2-2
2-2
2-4
2-4
2-5
2-5
2-5
2-6
2-6
2-7
2-9
2-11
2-11
2-12
2-12
Overview
This chapter describes how to connect both provided and customersupplied cables to the modem. In addition, it describes how to recover
AT commands when the modem is in Dumb mode and how to enter
initialization strings for unique applications.
Model 3830 Modem Package
After opening the modem’s package, check for damage and verify
that the following items are present:
•
Manual
•
Model 3830 modem
•
Power transformer
•
One 6-position, 4-wire modular cord
3830-A2-GB91-10
June 1994
2-1
COMSPHERE 3800 Series Modems – Model 3830
•
Two ferrite chokes and cable ties
•
Fax software and documentation (if fax option installed)
If any hardware components are damaged, notify your AT&T
Paradyne representative. Return equipment using the procedures
described in the Government Requirements and Equipment Return
section in the front of this book.
Customer-Supplied Equipment
The following customer-supplied equipment is required to complete a
data communications system using Model 3830 modem:
•
A DTE with an available EIA-232-D serial port.
•
A standard EIA-232-D male-to-female cable with a male
DB-25-S connector at one end to attach to the modem.
•
An ac line cord with an IEC 320 connector and appropriate
wall plug if using the 220-240V power transformer.
•
One of the following modular dial or leased network interfaces:
– RJ45S for dial programmable applications
– RJ11C for dial permissive applications
– JM8 for leased-line applications only
Model 3830 Installation
Before installing your standalone modem, make sure your installation
site is clean and well-ventilated. Allow space around the modem for
installing cables and telephone cords, and make sure the modem is
located within reach of the ac power outlet. The distance between
your modem and DTE should be minimized if DTE data rates exceed
19,200 bps. Also, low capacitance cables may be necessary for speeds
greater than 19,200 bps or distances greater than 50 feet.
The rear panel of the Model 3830 (Figure 2-1) modem has the
following switches and connectors:
2-2
•
An ON/Off power switch.
•
A 5-pin DIN type power receptacle for ac power transformer.
June 1994
3830-A2-GB91-10
2. Model 3830 Modem Installation
•
An 8-pin modular keyed jack for external telephone set use
only.
•
An 8-pin modular keyed jack for dial (PSTN) lines or 2-wire
leased lines.
•
A 25-pin DB-25-S receptacle for DTE interface.
Figure 2-1. Model 3830 Rear Panel
3830-A2-GB91-10
June 1994
2-3
COMSPHERE 3800 Series Modems – Model 3830
DTE Connection
Use the following procedures to connect the EIA-232-D cable and
ferrite choke from the modem to the DTE:
1. Make sure the modem’s rear panel power switch is Off.
2. Connect the DB-25-P (male) connector on the cable to the
DB-25-S (female) connector labeled DTE (Figure 2-1) on the
modem’s rear panel. Use a small screwdriver to tighten the cable
to the modem.
3. Connect the DB-25-P connector on the cable to the DB-25-S
connector on the DTE. Use a small screwdriver to tighten the
cable to the DTE.
To ensure compliance with FCC Part 15 Regulations, a ferrite choke
must be installed on the EIA-232-D interface cable.
1. Open the ferrite choke, place it around the DTE cable as close as
possible to the connector attached to the modem, and snap the
ferrite choke shut.
2. Install a cable tie behind the ferrite choke to prevent it from
sliding along the cable.
Dial-Line Connection
Use the following procedures to connect a Model 3830 to the dial
network interface. The feature/part number for a 7-foot, 6-position,
4-wire modular cord is 125-0067-0031:
1. Insert the 6-position, 4-conductor modular plug into the jack
labeled LINE, Figure 2-1.
2. Insert the other end of the modular cord into the dial network
interface.
2-4
June 1994
3830-A2-GB91-10
2. Model 3830 Modem Installation
2-Wire Leased-Line Connection
Use the following procedures to connect a Model 3830 modem to the
6-pin, center pair, leased-line network interface. (For 2-wire leased
line connection to a JM8 network interface, refer to Appendix C.)
1. Insert the 6-position, 4-conductor modular plug into the jack
labeled LINE, Figure 2-1.
2. Insert the other end of the modular cord into the leased-line
network interface.
Telephone Connection
Use the following procedures to connect the modem to a telephone:
1. Insert the 6-position, 4-conductor modular plug into the jack
labeled PHONE.
2. Insert the other end of the modular cord into the telephone.
AC Power Transformer Connection
Use the following procedures to connect the modem to an ac power
outlet:
1. Make sure the modem’s power switch is in the Off position.
2. Insert the power transformer’s 5-pin DIN male connector into the
modem’s rear panel ac power receptacle (Figure 2-1).
3. For the 115V power transformer, insert the power transformer
into a grounded ac power outlet.
For the 220–240V power transformer, insert the line cord’s outlet
connector into the power transformer’s IEC 320 power outlet.
Next, insert the line cord wall plug into the appropriate grounded
ac outlet.
3830-A2-GB91-10
June 1994
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COMSPHERE 3800 Series Modems – Model 3830
To ensure compliance with FCC Part 15 Regulations, a ferrite choke
must be installed on the power transformer cable.
1. Open the ferrite choke, place it around the power transformer
cable as close as possible to the connector attached to the
modem, and snap the ferrite choke shut.
2. Install a cable tie behind the ferrite choke to prevent it from
sliding along the cable.
Communications Software Installation
A personal computer commands and controls a dial modem through
communications software. This software, which is installed on the
PC, uses the AT command set to send instructions to the modem. A
dumb asynchronous terminal, however, does not require this software
since it can directly send AT commands.
The Model 3830 can be used with any major communications
software. Refer to your software’s user’s guide for installation
procedures. For an overview of how to use AT commands and a list of
AT commands supported by the Model 3830, refer to Chapter 4, AT
Command Set and S-Registers.
Modem Power-Up
Once your modem is properly connected to the DTE, dial or leased
lines, and ac outlet, press the modem’s rear panel power switch to the
ON position. The modem begins a power-up self-test in which all
front panel LEDs momentarily light (note that this also occurs on a
reset of the modem), and the Power LED remains ON. The state of
other LEDs depends on your modem’s configuration.
On initial power-up, the modem is in Command mode. To verify that
the modem is connected and functioning properly, enter the
following:
TYPE:
AT
PRESS:
Enter (Return)
The screen displays OK.
If the modem does not return OK, refer to Appendix A,
Troubleshooting.
2-6
June 1994
3830-A2-GB91-10
2. Model 3830 Modem Installation
Selecting Factory Configuration Options
After the modem passes the power-up self-test, it can be configured
for operation using one of two factory preset configurations.
These factory preset templates contain the most commonly used
configuration options (straps) for Asynchronous Dial and UNIX
hardware network configurations. Your modem is shipped from the
factory with the Async Dial default configuration options stored in
memory. If UNIX Dial is more appropriate for your configuration,
then you must change the factory setting as described as follows.
(The purpose of having preset configurations is so that you can have a
‘‘head start” in getting your modem operating and reducing the
amount of time required to configure your modem.)
NOTE
If you have already changed certain
configuration options, you may have lost AT
command control. For example, operating in
Synchronous mode or disabling AT commands
results in an inability to change configuration
options. To regain AT command control, refer to
the Recovering AT Commands section for these
procedures.
To change a factory template, perform the following steps (for more
information on changing factory templates using AT commands, refer
to Chapter 4, AT Command Set and S-Registers).
3830-A2-GB91-10
June 1994
2-7
COMSPHERE 3800 Series Modems – Model 3830
1. Use the AT&F&W command to load the appropriate
factory configuration to the appropriate storage area. Enter the
following:
TYPE:
AT&Fy&Wn
Where: y is one of the following Factory configurations:
0 for Async Dial
3 for UNIX Dial
5 for Cellular (Mobile)
6 for Cellular (PSTN)
and
Where: n is one of the following storage areas:
0 for Active (Saved)
1 for Customer 1
2 for Customer 2
NOTE
These three configuration areas are nonvolatile
memory locations. Active (Saved) contains the
most recently saved changes to any
configuration options. In the event of power loss,
the modem retrieves these configuration options.
Customer 1 and Customer 2 are user-defined
configuration areas.
2. PRESS:
Enter (Return)
The selected factory configuration is saved.
NOTE
When configuring your modem, keep a record of
its configuration options as a future reference in
case the modem must be replaced.
2-8
June 1994
3830-A2-GB91-10
2. Model 3830 Modem Installation
To establish a connection with a remote modem, use the D (Dial)
command. Refer to Chapter 4, AT Commands and S-Registers, for
more information.
Recovering AT Commands
AT commands are issued from asynchronous terminals and personal
computers. Certain dialing methods, such as V.25 bis and synchronous
operation, disable the use of AT commands and place the modem into
a state known as Dumb mode. The Model 3830 is capable of normal
operation when in Dumb mode. However, if the setting of a
configuration option must be changed, it can only be accomplished
using an AT command.
The AT Recovery command (AT***) places the modem into a
temporary state that restores AT commands. When in this state, the
modem’s previous settings are retained except for the following
configuration options:
•
The DTE Dialer Type configuration option (&M and &Q) is set
to AT
•
The Async/Sync Mode configuration option (&M and &Q) is
set to Async
•
The DSR Control configuration option (&S) is set to Forced On
•
The LSD Control configuration option (&C) is set to Forced
On
If these settings are not appropriate, then change them to a setting
compatible with your current application.
The procedures for an AT recovery using an asynchronous terminal or
personal computer are listed in the following section. Read through
these procedures before performing a recovery:
1. Turn the modem Off and then ON. The modem performs a
power-up self-test in which all LEDs light. While this is running,
repeatedly press the A key of your DTE’s keyboard (or keep the
key depressed if your keyboard automatically repeats characters
that way). Keep doing this until A’s (or a’s) appear on your DTE
screen. (You may use all uppercase or all lowercase characters.)
At least three consecutive A’s must be entered within a 2-second
time interval.
3830-A2-GB91-10
June 1994
2-9
COMSPHERE 3800 Series Modems – Model 3830
If these characters are not echoed back to the DTE screen after
the power-up self-test is complete, then the modem is still in
Dumb mode and maintains its current configuration. Turn the
modem Off and then ON again, and repeat Step 1.
2. Once the characters are echoed back to the DTE,
TYPE:
T***
(The case of this character must be consistent with the case used
in Step 1. Mixed case prefixes such as aT or At are not
recognized.)
This must be entered within 10 seconds after receiving the
echoed characters.
PRESS: Enter
The screen displays OK.
The modem is now in AT Recovery mode, and remains in this
state until a Save or power reset occurs. While in this mode, you
can use AT commands to make any necessary changes to
configuration options.
Keep in mind that the &C command is changed to Forced On
(&C0), the &M and &Q commands are changed to Async mode
with AT commands enabled (&M0 and &Q0), and the &S
command is changed to Forced On (&S0). If these settings are
not appropriate, then reset them to a desired choice before exiting
AT Recovery mode.
3. To save changes, use the &W command:
TYPE:
AT&Wn
Where: n is one of the following storage areas:
0 for Active (Saved)
1 for Customer 1
2 for Customer 2
PRESS: Enter
The modem exits AT Recovery mode and returns to its previous
application environment.
2-10
June 1994
3830-A2-GB91-10
2. Model 3830 Modem Installation
Initialization Strings
An initialization string contains several AT commands that are
entered at once to program the modem for a specific application.
The following initialization strings identify essential AT commands
that directly impact modem operation for a particular application. If
you need to modify these strings for your application, make sure
additional commands are inserted somewhere in the middle of the
initialization string. Whenever an &L command is used, it must
appear at the end of an initialization string.
V.25 bis Applications
For V.25 bis HDLC dial-line operation, create an initialization string
with the following commands. Note that the character format can be 8
data bits, no parity, and 1 stop bit; 7 data bits, odd parity, and 1 stop
bit; or 7 data bits, even parity, and 1 stop bit:
TYPE:
AT&F &D1 &S1 &M234 &W
PRESS:
Enter
For V.25 bis Bisync operation, create an initialization string with the
following commands. Note that the character format must be 7 data
bits, odd parity, and 1 stop bit:
3830-A2-GB91-10
TYPE:
AT&F &D1 &S1 &M233 &W
PRESS:
Enter
June 1994
2-11
COMSPHERE 3800 Series Modems – Model 3830
Synchronous Leased-Line Applications
For synchronous leased-line operation, create the following
initialization string with the following commands:
TYPE:
AT&F &D1 &S1 S44=n S45=n S82=n &M1 &Ln
&W
Where:
n is the value for the AT command. Refer to either
Table 4-2 or Table 4-3 in Chapter 4 to determine the
best possible values for these commands.
PRESS:
Enter
AT&T Exclusive Dialing for DATAKIT Applications
t
For AT&T exclusive dialing for DATAKIT applications, create an
initialization string with the following commands:
2-12
TYPE:
AT&F &C5 &D1 &S3 &R0 \D3 \Q1 \G1 S85=1
&M235 &W
PRESS:
Enter
June 1994
3830-A2-GB91-10
Fax Operation
3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Fax Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Overview
The procedures for sending and receiving facsimile documents with
your modem depend on the fax software you use. This chapter does
not contain specific procedures, but rather information that may make
it easier for you to use the documentation that came with your fax
software.
Fax Operation
With the fax option installed, your modem, in combination with your
computer and fax software, is capable of emulating the functions of a
fax machine. You can use it to send and receive fax files in
communication with another fax modem, or with a standard fax
machine. These fax files are images turned into the sort of data that
can be stored in your computer.
Fax machines and fax modems use special protocols different from
those used by standard modems. The device you intend to
communicate with must be compatible with your modem, which
means that it must be capable of using the same protocol. Your 3830
modem supports the EIA/TIA-592 standard for Class 2 fax modems.
Before you can send or receive a fax, the following must be true:
•
Your modem must be online with a compatible fax modem or
fax machine.
•
You must have fax software installed on your computer.
•
Your fax software must support Class 2 fax.
3830-A2-GB91-10
June 1994
3-1
COMSPHERE 3800 Series Modems – Model 3830
•
You must have configured your modem according to the
specifications of your fax software manual. For example:
– Some fax software requires that the modem have
Auto-Answer disabled. You can set this with the ATS0=0
command.
– Some fax software requires that the modem use software
flow control. You can set this with the AT\Q1 command.
– DTR Action should be set for standard RS232-D operation.
Use the AT&D2 command.
– LSD (Line Signal Detect) Control should be set for standard
RS232-D operation. Use the AT&C1 command.
– Data should be buffered during Error Control (EC)
negotiation. Use the AT/C1 command.
If your fax software requires that you change the configuration of
your modem, see the appropriate sections of Chapter 4, AT
Commands and S-Registers.
Your fax software uses AT commands to tell the modem what to do.
These commands, and the replies your modem makes (such as “OK”)
may be displayed on your computer terminal during fax operation, but
this depends on your software. You do not have to issue AT
commands yourself, unless you use AT commands to configure the
modem.
For more information about fax operation, see the manual that came
with your fax software.
3-2
June 1994
3830-A2-GB91-10
AT Command Set and
S-Registers
4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Between Data Mode and Online Command Mode . . . . . . . . .
Escape Sequence and Escape Guard Time . . . . . . . . . . . . . . . . . . . . . .
Command Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Result Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Command List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
4-1
4-2
4-2
4-3
4-4
4-6
4-28
Overview
This chapter discusses guidelines necessary to operate AT commands
as well as listing all AT commands supported by the Model 3830
modems. AT commands are issued from asynchronous DTEs.
Operating Modes
The Model 3830 modem has two operating modes: Command mode
and Data mode. Before a modem goes online (establishes a successful
connection with a remote modem), it is considered to be in Command
mode, an idle state where you can modify its operating parameters or
issue modem commands. (Any command issued is acknowledged
with a response in either words or digits known as result codes. Refer
to Table 4-1 for a listing of result codes.)
Once the modems are online, either by answering or originating a
call, they automatically switch to Data mode. Data mode is a state
where any entries made from the DTE are considered data and are
transmitted and received between modems. The modems remain in
Data mode until the connection is broken or until they are forced into
online Command mode using the escape sequence (+ + +).
3830-A2-GB91-10
June 1994
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COMSPHERE 3800 Series Modems – Model 3830
Switching Between Data Mode and Online Command Mode
Sometimes it is necessary to change operating parameters while the
modems are online. The Escape Sequence allows you to toggle the
modem between Data mode and online Command mode while
maintaining a connection with the remote modem. This is
accomplished using the escape sequence (+ + +) to exit Data mode
and the O command to return to Data mode.
Escape Sequence and Escape Guard Time
The escape sequence is only issued when the modem is online and in
Data mode. The Model 3830 modem uses three consecutive plus (+)
characters as the escape sequence. (To change this value, refer to
S-Register S2 discussed later in Table 4-3 in the S-Register List
section.)
To prevent the modem from interpreting an embedded + + + in data
as an escape sequence, the Escape Guard Time value determines the
idle time required before and after the escape sequence is issued. The
Model 3830 uses a 1-second pause as the Escape Guard Time. (To
change this value, refer to S-Register S12 discussed later in Table 4-3
in the S-Register List section.)
To enter online Command mode while in Data mode, enter the
following sequence:
TYPE:
+++
Use the O command to return to Data mode from online Command
mode. Enter the following command:
4-2
TYPE:
ATO
PRESS:
Enter
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Command Guidelines
Review the following guidelines before using any AT Commands.
•
The escape sequence (+ + +) is used to enter online Command
mode from Data mode.
•
The asynchronous character format for the AT command set
must be one of the following:
– 8 data bits + no parity + 1 stop bit.
– 7 data bits + no parity + 2 stop bits.
– 7 data bits + parity + 1 stop bit (parity can be odd, even,
mark, or space).
•
All commands (except A/ (repeat last command) and (+ + +)
must begin with the characters AT and end by pressing the
Enter key. The AT (or at) prefix clears the command buffer and
matches the modem speed and parity to that of the DTE.
Commands can be upper- or lowercase, but the modem will not
recognize mixed case prefixes (At or aT).
•
Commands can be entered one at a time or in strings. Strings
can have up to 40 characters after the AT prefix. You can use
spaces, hyphens (-), and parentheses ( ) as fillers to make the
commands easier to read; the modem ignores these fillers and
they are not counted among the characters which make up the
command string. Commands must be entered on one line and
end with the carriage return character (Enter key).
•
Commands with the suffix n have several options associated
with them. For example, in the Ln command, L1 sets the
speaker volume to Low and L3 sets the speaker volume to
High. If no value is entered for the n suffix, the modem
assumes a zero (0) value.
•
The A/ command (without pressing the Enter key) causes the
modem to repeat the last command entered.
•
Valid commands are acknowledged with numeric or word
result codes (unless the result codes have been disabled using
the Q1 command).
Table 4-1 lists all available result codes with numeric and word
equivalents.
3830-A2-GB91-10
June 1994
4-3
COMSPHERE 3800 Series Modems – Model 3830
Result Codes
Table 4-1 lists all valid result codes for the Model 3830 modem. Refer
to the Vn and Xn commands for more on result codes.
Table 4-1
(1 of 3)
Result Codes
Numbers
(1)
Numbers
(2)
0
0
OK
Command executed
1
1
CONNECT
Modem connected to line
2
2
RING
Modem receiving a ring
voltage from the VF line
3
3
NO CARRIER
Modem lost or does not
detect carrier signal, or does
not detect answer tone
4
4
ERROR
Invalid command
5
5
CONNECT 1200*
Connection at 1200 bps
6
6
NO DIALTONE*
No dial tone detected
7
7
BUSY*
Busy or trunk busy signal
detected
8
8
NO ANSWER*
No ‘‘quiet” answer (@)
10
10
CONNECT 2400*
Connection at 2400 bps
11
11
CONNECT 4800*
Connection at 4800 bps
12
12
CONNECT 9600*
Connection at 9600 bps
13
16
CONNECT 12000*
Connection at 12,000 bps
14
13
CONNECT 14400*
Connection at 14,400 bps
15
14
CONNECT 19200**
Connection at 19,200 bps
Word
Description
* Appears when the Extended Result Codes configuration option is enabled.
** Appears when the Extended Result Codes configuration option is set for Use
DTE Rate. This displays the DTE data rate instead of the line rate.
4-4
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-1
(2 of 3)
Result Codes
Numbers
(1)
Numbers
(2)
16
15
CONNECT 7200*
Connection at 7200 bps
17
17
CONNECT 16800*
Connection at 16,800 bps
19
1
CONNECT 300*
Connection at 300 bps
20
10
CONNECT 2400/
EC***
Connection at 2400 bps with
error control
21
11
CONNECT 4800/
EC***
Connection at 4800 bps with
error control
22
12
CONNECT 4800/
EC***
Connection at 4800 bps with
error control
23
16
CONNECT 12000/
EC***
Connection at 12,000 bps
with error control
24
13
CONNECT 14400/
EC***
Connection at 14,400 bps
with error control
25
17
CONNECT 16800/
EC***
Connection at 16,800 bps
with error control
26
15
CONNECT 7200/
EC***
Connection at 7200 bps with
error control
27
5
CONNECT 1200/
EC**
Connection at 1200 bps with
error control
28
28
CONNECT 38400**
Connection at 38,400 bps
29
14
CONNECT 19200/
EC***
Connection at 19,200 bps
with error control
Word
Description
* Appears when the Extended Result Codes configuration option is enabled.
** Appears when the Extended Result Codes configuration option is set for Use
DTE Rate. This displays the DTE data rate instead of the line rate.
*** Appears when the Extended Result Codes configuration option is set for Add/
EC. If this configuration option is set for Add/V42, MNP, then either V42b, V42,
MNP5, MNP4, MNP3, MNP2, or NoEC appears.
3830-A2-GB91-10
June 1994
4-5
COMSPHERE 3800 Series Modems – Model 3830
Table 4-1
(3 of 3)
Result Codes
Numbers
(1)
Numbers
(2)
Word
30
30
CONNECT 57600**
Connection at 57,600 bps
32
32
CONNECT 76800**
Connection at 76,800 bps
34
34
CONNECT 115200**
Connection at 115,200 bps
Description
** Appears when the Extended Result Codes configuration option is set for Use
DTE Rate. This displays the DTE data rate instead of the line rate.
AT Command List
AT commands are issued from an asynchronous DTE, such as a PC,
and control the modem’s operation and software configuration. AT
commands are only applicable when the DTE Dialer Type
configuration option is set for AT. (See &Mn and &Qn commands.)
AT commands are entered while the modem is in Command mode
and use the following format:
TYPE:
ATXn
Where:
X is the AT command and n is the specific value for
that command.
PRESS:
Enter
Table 4-2 lists all AT commands supported by the Model 3830
modem. The Async Dial factory default is listed in bold.
4-6
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(1 of 22)
Model 3830 AT Commands
***  AT Command Recovery Mode
Allows the modem to remain in Asynchronous data mode so that AT
commands can be used to change the modem’s current configuration.
Use this command when AT commands are disabled or the modem is
operating in Synchronous data mode.
This command can only be executed after the completion of a power-up
self-test. Refer to the Recovering AT Commands section in Chapter 2 for
procedures and guidelines on this command.
A/  Repeat Last Command
Reexecutes the last command string. (Not to be preceded with AT or
followed by pressing the Enter key.)
A  Answer Mode
Allows the modem to go off-hook and attempts to establish a connection
without waiting for a ring.
3830-A2-GB91-10
June 1994
4-7
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(2 of 22)
Model 3830 AT Commands
Dn  Dial
Begins the dialing sequence. The dial string n (modifiers and telephone
number) is entered after the D command.
Any digit 0–9, * , # , A, B, C, D, may be dialed as a DTMF tone. Only the
digits 0–9 can be dialed in Pulse Dial mode.
The following example shows how to dial through a PBX. The dial string
consists of the command string and the telephone number:
ATD9,5551234
Command Telephone
String
Number
Dial String
Modifiers include the following parameters:
T – Tone (DTMF) dial. Any digit 0–9, * , # , A, B, C, or D can be dialed as
tone.
P – Pulse dial. Only the digits 0–9 can be dialed in Pulse Dial mode.
NOTE: Once a dialing method (tone or pulse) has been specified, it will
remain active only until the end of that dial string. The factory setting is
Tone dial.
, – Pause. Causes the modem to pause before processing the next
character in the dial string. The length of this pause is determined by the
value held in S-Register S8, the Pause Time configuration option.
W – Wait for dial tone. Modem waits for a second dial tone before
processing the dial string. This can be the initial dial tone or a second
tone received when dialing through a tandem PBX (for example,
9W555-6789), or when invoking special features (for example,
70#W555-6789, where 70# is the local telephone company command
that disables Call Waiting).
4-8
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(3 of 22)
Model 3830 AT Commands
Dn, continued
R – Reverse Dial mode. Causes the originating modem to send out an
answertone once it no longer detects ringback. (Ringback is the ring you
hear at the originating site when making a call.) The R parameter must
be the last character in the dial string. For correct operation, at least one
ringback must be detected; therefore, the remote modem should be
configured to answer on the second ring or subsequent rings.
@ – Quiet answer. Wait for five seconds of silence after dialing the
number. If the silence is not detected, the modem sends a NO ANSWER
result to the DTE.
! – Hook flash. This causes the modem to go on-hook for 0.5 seconds,
then return to off-hook.
; – Return to Command mode. Modem returns to Command mode after
dialing a number without disconnecting the call. This is useful when the
number exceeds 40 characters, or when the wait time between parts of a
dial string is unknown.
Space, – , and ( ) . These characters are ignored by the dial string and
can be included in the dial string to enhance readability.
DS=n  Dial Stored Number
Dials the number stored in Location n (1–10). (To store a telephone
number, refer to the &Zn=x command.)
En  Command Character Echo
Controls whether or not characters are echoed back to the DTE when the
modem is in Command mode.
E0 Disables echo to the DTE.
E1 Enables echo to the DTE.
Hn  Hook Switch Control
Allows the modem to go off-hook or on-hook.
H or H0 Modem goes on-hook.
H1 Modem goes off-hook.
3830-A2-GB91-10
June 1994
4-9
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(4 of 22)
Model 3830 AT Commands
In  Identification
Provides useful information when upgrading or servicing the product.
I0
I1
I2
I3
I4
I5
I6
I9
Displays product code (default is 144).
Displays 3-digit firmware revision number.
Performs an EPROM check.
Displays serial number.
Displays model number.
Displays hardware part number.
Displays software part number.
Displays 3-digit firmware revision number (same as I1).
I10 Allows you to change the value displayed by I0:
I10=0 causes I0 to display 144 (default).
I10=1 causes I0 to display 240.
I10=2 causes I0 to display 480.
I10=3 causes I0 to display 960.
I10=4 causes I0 to display 120.
I11 Displays the program memory checksum.
I19 Displays the entire firmware revision number.
Ln  Speaker Volume
L0 Selects low volume.
L1 Selects low volume.
L2 Selects medium volume.
L3 Selects high volume.
Mn  Speaker On/Off
M0 Speaker always Off.
M1 Speaker on until carrier signal is detected.
M2 Speaker always ON.
O  Return to Online or Data Mode
Returns modem to Data mode from Online Command mode.
P  Pulse Dial
Sets the modem for Pulse Dial mode. See D command.
4-10
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(5 of 22)
Model 3830 AT Commands
Qn  Result Codes
Result codes are informational messages (such as Connect and Ring)
sent from the modem and displayed on the asynchronous DTE terminal.
Refer to Table 4-1 for a list of result codes.
Q0 Enables modem to send result codes to the DTE.
Q1 Disables modem from sending result codes to the DTE.
Q2 Enables in Originate mode only for modem to send result codes to
the DTE. Required for most UNIXr applications.
Sn=r  Change S-Register
Changes the contents of an S-Register, where n is the S-Register, and r
is the new value.
Sn?  Display S-Register
Displays the value of an S-Register, where n is the S-Register number.
T  Tone Dial
Sets the modem for Tone (DTMF) dial mode. See D command.
Vn  Result Codes Format
Controls whether or not result codes appear as words or as numeric
codes. Some DTEs do not recognize result codes as words; therefore,
numbers are required. The Numbers (2) format is required for some
modem pooling applications. Refer to Table 4-1 for a list of result codes.
V0 Displays result codes in Number (1) format (digits).
V1 Displays result codes as text.
V2 Displays result codes in Number (2) format (digits).
3830-A2-GB91-10
June 1994
4-11
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(6 of 22)
Model 3830 AT Commands
Xn  Extended Result Code, Dial Tone Detect, and Busy Tone Detect
The Xn command sets three configuration options simultaneously:
X0
X1
X2
X3
X4
X5
X6
X7
Ext
Result Code
Dial Tone
Detect
Disable
Enable
Enable
Enable
Enable
Add/EC
Add/V42,MNP
Use DTE Rate
Disable
Disable
Enable
Disable
Enable
Enable
Enable
Enable
Busy Tone
Detect
Disable
Disable
Disable
Enable
Enable
Enable
Enable
Enable
EXTENDED RESULT CODE
Informational messages such as VF (line) connect rate and Error Control
are displayed with the result codes.
Disable. Displays basic result codes: OK, CONNECT, RING, NO
CARRIER, and ERROR.
Enable. Displays basic result codes in addition to the CONNECT rate
message (for example, CONNECT 14400).
Add/EC. If error control is negotiated, attaches the /EC suffix to the
CONNECT rate message.
Add/V42,MNP. Attaches the V42b, V42, MNP5, MNP4, MNP3, MNP2, or
NoEC suffixes to the CONNECT rate message.
Use DTE Rate. Displays DTE data rate instead of line CONNECT rate
message.
DIAL TONE DETECT
Sets the modem for dial tone detection (enable) or blind dialing (disable).
Disable. Sets the modem for blind dialing.
Enable. Sets the modem for dial tone detect.
4-12
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(7 of 22)
Model 3830 AT Commands
Xn, continued
BUSY TONE DETECT
Sets the modem to monitor for Busy Tone (Enable) or ignore Busy Tone
(Disable).
Disable. Modem ignores busy tone.
Enable. Modem monitors for busy tone.
Yn  Long Space Disconnect
Determines the modem’s response to a continuous spacing condition
sent from the remote modem when it goes on-hook. Issuing a long space
is one method of disconnecting a call.
Y0 Disable. Ignores long space.
Y1 Enable. Disconnects if long space is detected. Enables transmission
of a long space.
Zn  Reset and Load Active
Z0 Loads configuration options from Active (Saved) to Active (Operating).
Z1 Loads configuration options from Customer 1 to Active (Operating).
Z2 Loads configuration from Customer 2 to Active (Operating).
Z3 Loads configuration options from Active (Saved) to Active (Operating)
and performs a reset.
Z9 Performs a full modem reset as if the modem were powered off and
on.
3830-A2-GB91-10
June 1994
4-13
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(8 of 22)
Model 3830 AT Commands
&Cn  LSD Control
Line Signal Detect (LSD) is a signal indicating that the carrier signal is
being received from the remote modem. It is normally turned Off to the
DTE when the power level of the received carrier signal drops below the
carrier detect threshold.
&C0 Forced On. LSD ON at all times.
&C1 Standard RS232. LSD is ON when the remote modem’s carrier
signal is detected. LSD is Off when carrier signal is not detected.
&C2 Wink When Disconnect. LSD normally forced ON, turns Off for
approximately one second upon disconnecting.
&C3 Follows DTR. State of LSD follows state of DTR.
&C4 Simulated Control Carrier. State of LSD follows state of remote
modem’s RTS via V.13 simulated control carrier signaling. Note that the
remote modem’s RTS Action configuration option must be set to
Simulated Control Carrier.
&C5 DTR/Disconnect Off. State of LSD follows state of DTR except
upon a disconnect where LSD always turns Off. DTR must then toggle
Off and ON to turn LSD ON. Use this setting for AT&T DATAKIT
applications. Note that to use this configuration option, the DTR Action
configuration option must be set to Stndrd_RS232 (&D1 or &D2).
&C6 Bridge Retrain. LSD behaves as if it were set for Standard RS232,
except that it is turned Off when a retrain condition lasts longer than 10
seconds, and turned ON when no retrain condition is detected for 10
seconds.
4-14
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(9 of 22)
Model 3830 AT Commands
&Dn  DTR Action
Data Terminal Ready (DTR) is a signal from the DTE to the modem
indicating that the DTE is connected and ready for operation.
&D0 Ignore. Modem ignores the true status of DTR and treats it as
always ON.
&D1 Off=Command Mode. Modem enters online Command Mode if
connected when DTR switches off.
&D2 Standard RS232. DTR Signal is controlled by the DTE.
&D3 Off=Reload Strap. Follows Standard RS232 operation, except that
when DTR switches Off, the modem loads the Active (Saved) area into
the Active (Operating) area.
&D4 Controls On-Hook. Follows Standard RS232 operation, except that
modem does not disconnect until DTR is lowered by the DTE.
&Fn  Select Factory Default Configuration Options
Loads factory configuration options into the Active (Operating) area. The
&F5 and &F6 options invoke the Enhanced Throughput Cellular
(ETC ) feature.
t
t
&F0
&F3
&F5
&F6
Async Dial
UNIX Dial
Cellular (Mobile)
Cellular (PSTN)
3830-A2-GB91-10
June 1994
4-15
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(10 of 22)
Model 3830 AT Commands
&Fn  Select Factory Default Configuration Options (cont’d)
If your modem is attached to a cellular telephone, use the &F5 command
to configure the modem for cellular communications. &F5 sets the
following configuration options:
AT Command
Option
Value
Maximum Frame Size
\A4
Error Control Mode
\N4
Auto-Answer Rings
S0=3
No Answer Timeout
S7=120
No Carrier Disconnect
S10=100
V.32 bis Train
S43=1
V.32 bis Autorate
S76=3
V.42 ARQ Window Size S89=9
Cellular Enhancements
S91=1
If your modem is attached to a normal dial telephone line but sometimes
communicates with a modem that is attached to a cellular phone, use the
&F6 command. &F6 (Cellular(PSTN)) sets the following configuration
options:
AT Command
Option
Value
Transmit Level
&I100
Error Control Mode
\N4
No Answer Timeout
S7=120
No Carrier Disconnec
S10=100
V.32 bis Train
S43=1
V.42 ARQ Window Size S89=9
Cellular Enhancements
S91=1
&Gn  V.22 bis Guard Tone
Determines whether the V.22 bis guard tone is disabled, set to 550 Hz, or
set to 1800 Hz.
&G0 Disable.
&G1 550 Hz.
&G2 1800 Hz.
4-16
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(11 of 22)
Model 3830 AT Commands
&In  Dial Transmit Level for Cellular Auto
When Dial Transmit Level Type is set to Permissive, &In sets Dial
Transmit Level to a value between –10 and –32 dBm. &I99 and &I100
causes the level to be varied automatically according to conditions for
Enhanced Throughput Cellular (ETC) operation. &J0 overrides this
command.
&I10 –10 dBm
&I11 –11 dBm
D
D
D
D
&I32 –32 dBm
&I99 Automatically adjusted according to the ETC1.0 specification. Use
only with remote modems set to &I99, and limit the data rate to 4800 bps
(S41=5).
&I100 Automatically adjusted according to the ETC1.1 specification. Set
by &F6.
&Jn  Dial Transmit Type
Sets the power output level of the transmit signal over dial lines.
&J0 Permissive (–9 dBm).
&J1 Programmable.
&Ln  Leased Mode
Sets the modem for 2-wire leased-line operation in Answer mode
(receiving a call) or in Originate (initiating a call) mode.
&L0 Disables leased-line operation.
&L1 2-wire originate leased-line operation.
&L3 2-wire answer leased-line operation.
The &L command will cause the modem to reset before entering or
exiting Leased-Line mode. Therefore, it must be entered as the last
command in an initialization string.
3830-A2-GB91-10
June 1994
4-17
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(12 of 22)
Model 3830 AT Commands
&Mn or &Qn  Async/Sync Mode and DTE Dialer Type
Sets the modem for either asynchronous or synchronous operation and
selects the type of dialing method the modem uses.
&M0, &Q0 Modem operates in Asynchronous data mode and uses AT
Command protocol.
&M1, &M3, &Q1, &Q3 Modem operates in Synchronous data mode and
uses AT Command protocol.
&M2, &Q2 Modem operates in Synchronous data mode and dials the
telephone number stored in directory location 1 when the DTR signal
turns Off and then ON.
&Q4
Modem operates in Asynchronous data mode with AT commands
and Hayes AutoSync enabled. (NOTE: There is no &M4 command.)
&M231, &Q231 Modem operates in Asynchronous data mode and
disables any type of AT command dialing protocol.
&M232, &Q232 Modem operates in Asynchronous data mode and uses
V.25 bis asynchronous dialing.
&M233, &Q233 Modem operates in Synchronous data mode and uses
V.25 bis bisynchronous dialing.
&M234, &Q234 Modem operates in Synchronous data mode and uses
V.25 bis HDLC dialing.
&M235, &Q235 Modem operates in Asynchronous data mode and
enables a subset of the AT&T command set. This is required for AT&T
DATAKIT dial-out applications.
The &M2, &M231 through &M235, &Q2, and Q231 through Q235
commands disable the use of AT commands and force the modem into
Dumb mode. The only way to regain control of the modem is to recover
AT Commands as described in the Recovering AT Commands section in
Chapter 2.
4-18
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(13 of 22)
Model 3830 AT Commands
&Rn  RTS Action Request-to-Send (RTS) is a signal from the DTE to
the modem indicating the DTE has data to send to the modem.
&R0 Standard RS232. DTE controls RTS to the modem in normal
EIA-232-D operation. RTS must be ON for the DTE to transmit to the
modem.
&R1 Ignores RTS. Modem assumes RTS is always ON. Use this
selection when the DTE does not provide RTS to the modem.
&R2 Simulated Control Carrier. RTS input controls the remote modem’s
LSD signal. This is used for DTEs that require Line Signal Detect (LSD)
to toggle ON and Off to simulate half-duplex operation.
&R3 Control Carrier. Not valid for Model 3830 operation.
3830-A2-GB91-10
June 1994
4-19
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(14 of 22)
Model 3830 AT Commands
&Sn  DSR Control
Data Set Ready (DSR) is a signal from the modem to the DTE indicating
the modem is connected and ready for operation.
&S0 Forced On. Forces DSR output ON constantly. This is usually used
for leased-line applications and when the DTE requires DSR to always be
ON.
&S1 Standard RS232. Modem controls DSR to the DTE. The modem
raises DSR when it begins the handshake process. DSR lowers upon
disconnect. The modem is not ready to receive data until DSR, CTS, and
LSD are active.
&S2 Wink When Disconnect. DSR is normally forced ON, but is turned
Off for 1 to 2 seconds upon a disconnect.
&S3 Follows DTR. When the modem receives DTR from the DTE, it
sends DSR to the DTE.
&S4 On Early. DSR is low when the modem is in the idle state. DSR goes
high immediately upon a command to enter Data mode. This setting is
required for some modem pooling applications.
&S5 Delay to DTE. Operation is similar to the Standard RS232 setting
except that DSR does not turn ON until the modem enters Data mode.
Normally, the modem raises DSR when it begins the handshaking
process.
&S6 Dial Backup Toggle. DSR is turned Off during a dial backup attempt
in Leased mode, and on when a dial backup attempt is completed. DSR
is also turned Off when a disconnect begins, and ON when the
disconnect is complete.
4-20
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(15 of 22)
Model 3830 AT Commands
&Tn  Tests
&T0 Abort. Stops any test in progress.
&T1 Local Analog Loop.
&T2 Pattern. Transmits and receives a 511 Bit Error Rate Test (BERT).
*&T3 Local Digital Loopback test.
&T4 Enables Receive Remote Loopback Response configuration
option.
&T5 Disables Receive Remote Loopback Response configuration
option.
*&T6 Remote Digital Loopback test.
*&T7 Remote Digital Loopback with Pattern.
&T8 Local Loopback with Pattern.
&T9 Self-Test.
To start a test, set the S18 register to a desired test duration in seconds
(for example, 30 seconds), and then issue the &T command. Test results
display as the number of errors sent or received over the number of
blocks sent or received.
* The modem must be online and in Direct mode for this test to work
properly.
3830-A2-GB91-10
June 1994
4-21
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(16 of 22)
Model 3830 AT Commands
&Vn  View Configuration Options
Displays each configuration group within the Active (Operating), Active
(Saved), Customer 1, and Customer 2 configuration areas as well as the
telephone numbers stores in directory locations 1–10.
&V0 Active (Operating) configuration options.
&V1 Active (Saved) configuration options.
&V2 Customer 1 configuration options.
&V3 Customer 2 configuration options.
&V4 Directory locations 1–10.
&Wn  Write (Save to Memory)
Saves the current configuration options in Active (Operating) to one of
three configuration areas:
&W0 Saved to Active (Save).
&W1 Saved to Customer 1.
&W2 Saved to Customer 2.
&Xn  Transmit Clock Source
Determines the source of timing for synchronous data transmitted from
the DTE.
&X0 Internal. Modem provides transmit clock source for synchronous
data (Pin 15).
&X1 External. Modem derives external transmit clock source provided on
Pin 24 for synchronous data.
&X2 Receive Clock Loop. Modem derives transmit clock source from
receive signal for synchronous data (Pin 17).
4-22
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(17 of 22)
Model 3830 AT Commands
&Zn =x  Store Telephone Numbers
Modem saves the telephone number and dial command modifiers (if any)
entered for x (up to 40 characters in length) in Directory Location n
(1–10). The DS command dials numbers stored this way.
For example, the command AT&Z1=5551234 stores the telephone
number 555 –1234 into directory location 1.
To clear a telephone number from a memory location, issue the &Zn
command without entering a telephone number.
\An  Maximum Frame Size
Sets the maximum frame size for V.42 and MNP. For V.42, 128 is the
maximum value; if a larger value is specified, it will default to 128. For
MNP, the minimum value is 64; if a smaller value is specified, it will
default to 64.
\A0
64
\A1
128
\A2
192
\A3
256
\A4
32
\A5
16
&F5 sets this to \A4.
3830-A2-GB91-10
June 1994
4-23
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(18 of 22)
Model 3830 AT Commands
\Cn  Error Control Negotiate Buffer
Determines if the answering modem buffers the data that it received from
the remote modem during an interval in which the modem attempts to
establish a connection using error control. Online changes to this
configuration option do not take effect until a disconnect occurs.
\C0 Disable.
\C1 Enable.
\C2 Disable and Switch. Modem automatically switches to Buffer mode if
it receives an error control fallback character (an ASCII carriage return 
see %A command) during error control negotiation.
\Dn  CTS Control
Clear-to-Send (CTS) is a signal from the modem to the DTE indicating
that it can accept data from the DTE.
\ D0 Forced On. Forces CTS to always ON.
\ D1 Standard RS232.
\ D2 Wink When Disconnect. CTS is turned Off for 1 to 2 seconds upon a
disconnect.
\ D3 Follows DTR. The state of CTS follows the state of DTR.
\Gn Modem to Modem Flow Control
If a modem’s buffers begin to fill due to data it is receiving from the
remote modem, but is not passing the data on to the DTE, it can issue
XON/XOFF flow control characters to the remote modem. This only
applies during Buffer mode connections where the remote modem also
has modem-to-modem flow control enabled. If Error Control mode is
enabled, flow control between the modems will happen automatically,
regardless of the setting of this configuration option.
\G0 Disable.
\G1 Enable.
4-24
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(19 of 22)
Model 3830 AT Commands
\Kn  Buffer Control, Send Break Control, Break Forces Escape
The \Kn command sets three configuration options simultaneously:
\K0
\K1
\K2
\K3
\K4
\K5
\K6
Break
Buffer
Control
Discard Data
Discard Data
Keep Data
Keep Data
Keep Data
Keep Data
Discard Break
Send
Break
Control
Break First
Break First
Break First
Break First
Data First
Data First
Not Applic.
Break
Forces
Escape
Enable
Disable
Enable
Disable
Enable
Disable
Disable
BREAK BUFFER CONTROL
Determines if data stored in the modem’s buffer is saved or discarded
when the DTE issues a break sequence.
SEND BREAK CONTROL
Determines what is sent from the modem first, data or break if a break
sequence is sent from the DTE.
BREAK FORCES ESCAPE
Determines whether or not the modem should enter Command mode
when it receives a break character from the DTE.
3830-A2-GB91-10
June 1994
4-25
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(20 of 22)
Model 3830 AT Commands
Nn  Error Control Mode
Determines the type of error control used by the modem. In most cases,
V42/MNPorBfr is the best choice. If V.42 bis and MNP are enabled, then
the modem uses the following priority for error control negotiation:
V.42 bis, V.42, MNP 5 and below. Online changes do not take effect until
a disconnect occurs.
\ N0 Buffer Mode.
\ N1 Direct Mode.
\ N2 MNP or Disconnect.
\ N3 MNP or Buffer.
\ N4 V.42/MNP or Disconnect.
\ N5 V.42/MNP or Buffer.
&F5 and &F6 (Cellular) set this to \N4.
 The \Qn command controls two configuration options simultaneously:
\ Flow Control
of DTE
\Q0
\Q1
\Q2
\Q3
\Q4
\Q5
\Q6
Disable
XON/XOFF
CTS to DTE
CTS to DTE
XON/XOFF
Disable
Disable
Flow Control
of Modem
Disable
XON/XOFF
Disable
RTS to Modem
Disable
XON/XOFF
RTS to Modem
FLOW CONTROL OF DTE
Determines how the modem controls the flow of data from the DTE.
FLOW CONTROL OF MODEM
Determines how the DTE controls the flow of data from the modem.
4-26
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-2
(21 of 22)
Model 3830 AT Commands
\Tn  No Data Disconnect Timer
Forces the modem to disconnect if no data is transmitted or received
within a specified amount of time.
\T0 Disable.
\Tn Where n is a value from 1 to 255 in 1-minute increments.
\ Xn  XON/XOFF Passthrough Flow Control
The way this configuration option functions depends on how the modem
is configured for flow control.
When the modem is configured for XON/XOFF flow control (see \Qn,
Flow Control of DTE), this configuration option determines if flow control
characters received from the local DTE will be passed on to the remote
modem.
If configured for modem-to-modem flow control (see \G – Modem to
Modem Flow Control), this configuration option determines if flow control
characters received from the line will be passed on to the DTE.
\ X0 Disable.
\ X1 Enable.
%An  Error Control Fallback Character
This configuration option allows you to enter the ASCII value of the error
control fallback character. This provides the remote modem with the
ability to end the error control link negotiating (handshaking) sequence by
sending this character. The modems will connect in Buffer mode (no error
control). Online changes do not take effect until a disconnect occurs.
%An Where n is an ASCII value from 0 to 127. Factory default is 013
(ASCII carriage return).
%Cn  MNP5 Data Compression
Determines if the modem uses MNP Class 5 data compression. It can be
set independently of V.42 bis data compression. Online changes do not
take effect until a disconnect occurs.
%C0 Disable.
%C1 Enable.
3830-A2-GB91-10
June 1994
4-27
COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(22 of 22)
Model 3830 AT Commands
‘‘Hn  V.42 bis Compression
Enables or disables V.42 bis data compression.
‘‘H0 Disable.
“H1 Transmit only.
“H2 Receive only.
‘‘H3 Enable.
S-Register List
S-Registers affect the operating parameters of the Model 3830
modem. These registers are applicable only when the DTE Dialer
Type configuration option is set for AT. (See &Mn and &Qn
commands.)
S-Registers can be displayed and/or modified when the modem is in
Command mode. To display the value of an S-Register, issue the
following command:
TYPE:
ATSn?
Where:
n is the register number.
PRESS:
Enter
To modify the value of an S-Register, issue the following command:
TYPE:
ATSn=r
Where:
n is the register number, and r is the new value.
PRESS:
Enter
Table 4-3 lists all S-Registers supported by the Model 3830.
4-28
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(1 of 15)
Model 3830 S-Registers
S0  Auto-Answer Ring Number
Determines the number of rings the modem will count before
automatically answering a call.
Enter zero (0) if you do not want the modem to automatically answer any
calls. Otherwise, enter a value from 1–255 for the number of rings to
count before answering. Note that if disabled, the modem can only
answer with an ATA command.
Factory setting is 1.
S2  AT Escape Character
Determines ASCII value used for escape sequence (+++) to enter
Command mode from Data mode.
Enter a value from 0 to 127 for the escape character. Any value greater
than 127 causes the modem to disable the escape sequence. When the
escape sequence is disabled, the modem cannot return to Command
mode until the call is disconnected.
Factory setting is 43 (ASCII + key).
S3  Carriage Return Character
Determines ASCII value used as the carriage return (Enter key). This
character is used to end command lines and result codes.
Enter a value from 0 to 127 for the command end character.
Factory setting is 13 (ASCII carriage return).
NOTE: The &W command used to save this change must be on a
separate line. This ensures both that the change is intentional, and that
the DTE can enter the new character.
S4  Line Feed Character
Determines ASCII value used as the line feed character.
Enter a value from 0–127 for the line feed character.
Factory setting is 10 (ASCII line feed).
3830-A2-GB91-10
June 1994
4-29
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(2 of 15)
Model 3830 S-Registers
S5  Backspace Character
Determines ASCII value used as the backspace (Backspace key). This
character moves the cursor to the left and erases the previous character.
Enter a value from 0–127.
Factory setting is 08 (ASCII backspace).
S6  Blind Dial Pause
Determines how long (in seconds) the modem waits after going off-hook
before dialing a telephone number if using result code X0, X1, or X3.
Enter a value from 2–255 seconds.
Factory setting is 2 seconds.
S7  No Answer Timeout
Determines how long (in seconds) an originating modem waits before
abandoning a call when no answer tone is received.
Enter a value from 1–255 seconds.
Factory setting is 45 seconds.
S8  ‘‘,” Pause Time for the Dial Modifier
Determines how long (in seconds) the modem pauses when it encounters
a comma (,) in the Dial command string.
Enter a value from 0–255 seconds.
Factory setting is 2 seconds.
S10  No Carrier Disconnect
Determines how long (in tenths of seconds) the modem allows the carrier
signal to be Off before disconnecting the call.
Enter a value from 0–254 in 0.1 second increments. (A value of 255
disables this register.)
Factory setting is 20 (2 seconds).
4-30
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(3 of 15)
Model 3830 S-Registers
S12  Escape Guard Time
Sets the value (in 20-millisecond increments) for the required pause
before and after the escape sequence is issued. The guard time prevents
the modem from interpreting data as the escape sequence characters.
Enter a value from 0–255 in 20-millisecond increments. For example, the
factory setting of 50 equals 1000 milliseconds or one second. Factory
setting is 50 (1 second).
S18  Test Timeout
Sets the duration (in seconds) for the modem tests. This automatically
cancels any test in progress after the time of this register expires. Any
test can be manually canceled by issuing the escape sequence (+++)
followed by the &T0 command.
Enter a value from 0–255 seconds. (A value of 0 disables this register.)
Factory setting is Disable (0).
S26  RTS-to-CTS Delay
Sets the length of time (in 10-millisecond increments) the modem waits
after receiving RTS before issuing CTS to the DTE.
Enter a value from 0–255.
Factory setting is 0 milliseconds.
3830-A2-GB91-10
June 1994
4-31
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(4 of 15)
Model 3830 S-Registers
S36  Rate Auto Originate
Initiates a dial backup call, using the phone number in directory location
1, when the leased-line rate of the modem falls back to or below a certain
speed.
Register has the following values:
0 = Disable
1 = On fallback to 4,800
2 = On fallback to 7,200
3 = On fallback to 9,600
4 = On fallback to 12,000
5 = On fallback to 14,400
6 = On fallback to 16,800
NOTE: Rate Auto-Originate is valid only when V.32 bis Autorate is
enabled (S76=0).
S37  Auto Redial
Works in conjunction with the Bad Lines Auto Originate and Rate Auto
Originate options. It allows repeated automatic dial backup attempts by
specifying the range of Directory Locations that can be tried. The modem
must be in Originate mode.
Register has the following values:
0 = Use Directory Location 1
1 = Use Directory Locations 1–2
2 = Use Directory Locations 1–3
3 = Use Directory Locations 1–4
D
D
D
D
D
D
9 = Use Directory Locations 1–10
NOTE: The modem must be in Originate mode to perform an automatic
dial backup.
4-32
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(5 of 15)
Model 3830 S-Registers
S39  Receive Buffer Disconnect Delay
Determines the maximum amount of time the modem can continue to
send data in its Receive Buffer to the DTE after the modem is
commanded by the DTE to disconnect, or after the modem detects a line
disconnect.
Register has the following values:
0 = Disable (Immediate disconnect)
1 = 1 second
2 = 2 seconds
D
D
D
D
255 = 255 seconds
S41  Dial-Line Rate
Determines the modem’s highest data rate and modulation scheme for
operation on dial lines.
Register has the following values:
1 = 14,400 (V.32 bis)
2 = 12,000 (V.32 bis)
3 = 9600 (V.32 bis/V.32)
4 = 7200 (V.32 bis)
5 = 4800 (V.32 bis/V.32)
6 = 2400 (V.22 bis)
7 = 1200 (V.22)
8 = 1200 (212A)
10 = 0–300 (V21)
11 = 0–300 (103J)
12 = 1200/75 (V.23)
13 = 75/1200 (V.23)
20 = 19,200 (V.32terbo)
21 = 16,800 (V.32terbo)
Factory setting is 19,200 (V.32terbo).
3830-A2-GB91-10
June 1994
4-33
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(6 of 15)
Model 3830 S-Registers
S43  V.32 bis Train
Register controls the modem’s train time for V.32 bis/V.32 mode.
Register has the following values:
0 = Long (A long train is required for satellite links which have long
roundtrip delays.)
1 = Short
Factory setting is Long.
S44  Leased-Line Rate
Determines the modem’s highest data rate and modulation scheme for
operation on 2-wire leased lines in either Answer or Originate mode.
Register has the following values:
0 = 14,400 (V.32 bis)
1 = 14,400 (V.32 bis)
2 = 12,000 (V.32 bis)
3 = 9600 (V.32 bis)
4 = 7200 (V.32 bis)
5 = 4800 (V.32 bis)
6 = 2400 (V.22bis)
18 = 19,200 (V.32terbo)
19 = 16,800 (V.32terbo)
Factory setting is 19,200 (V.32terbo).
S45  Leased Line Transmit Level
Level Determines the modem’s transmit power output level over leased
lines.
Enter a value from 0–15 dBm.
Factory setting is 0 dBm.
4-34
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(7 of 15)
Model 3830 S-Registers
S48  Leased Line Carrier On Level
Determines if the modem disconnects if the carrier signal on leased lines
falls below –26 dBm or –43 dBm.
Register has the following values:
0 = –43 dBm
1 = –26 dBm
Factory setting is –43 dBm.
S49  Transmit Buffer Disconnect Delay
Determines the maximum amount of time the modem can continue to
send data in its Transmit Buffer to the remote modem after it is
commanded by the DTE to disconnect.
Register has the following values:
0 = Disable (Immediate disconnect)
1 = 1 second
2 = 2 seconds
D
D
D
D
255 = 255 seconds
Factory default is 10 seconds.
S51  DTE Remote Loopback (CT140)
Determines if the modem performs a remote digital loopback if it receives
a CT140 signal from the DTE.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
3830-A2-GB91-10
June 1994
4-35
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(8 of 15)
Model 3830 S-Registers
S52  DTE Local Loopback (CT141)
Determines if the modem performs a local analog loopback if it receives a
CT141 signal from the DTE.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S55  Access from Remote
Determines whether the 3830 modem’s configuration options can be
accessed by a remote 3800 Series modem via a dial-line or leased-line
connection.
0 = Enable
1 = Disable
Factory default is Enable.
S61  CT111 Rate Control
Determines if CT111 Rate is disabled, set for Fallback 1 or Fallback 2.
CT111 Rate allows the DTE to control modem rate via Pin 23 of the
EIA-232-D interface. This configuration option determines the effect of
the DTE Rate Control signal. It is only valid in Async Direct mode and
Synchronous mode. For proper operation, disable the V32 bis Autorate
(S76) and V32 bis Automode (S78) configuration options.
Register has the following values:
0 = Disable
1 = Fallback 1
2 = Fallback 2
Factory setting is Disable
4-36
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(9 of 15)
Model 3830 S-Registers
S62  V.25 bis Coding
Identifies to the modem the type of coding used by the DTE while in V.25
bis mode.
Register has the following values:
0 = ASCII
1 = EBCDIC
Factory setting is ASCII.
S63  V.25 bis Idle Character
Identifies to the modem the type of idle fill used by the DTE while in V.25
bis mode.
Register has the following values:
0 = Mark
1 = Flag
Factory setting is Mark.
S64  V.25 bis New Line Character
Identifies to the modem the type of line terminator used by the DTE while
in V.25 bis mode.
Register has the following values:
0 = Carriage Return and Line Feed
1 = Carriage Return
2 = Line Feed
Factory setting is carriage return and line feed (CR + LF).
3830-A2-GB91-10
June 1994
4-37
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(10 of 15)
Model 3830 S-Registers
S65  Line Current Disconnect
Determines if the modem disconnects if an interruption in loop current
greater than 8 milliseconds or 90 milliseconds occurs.
Register has the following values:
0 = Enable (8 msec)
1 = Enable (90 msec)
2 = Disable
Factory setting is Enable (8msec).
S67  Directory Location 1 Callback
Determines if the modem uses the single number callback function.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S69  Make Busy Via DTR
Determines if the modem goes off-hook (busy) when DTR is Off.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
4-38
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(11 of 15)
Model 3830 S-Registers
S76  V.32 bis Autorate (Dial Line)
Determines if the Autorate function is used on dial lines when connected
in V.32 bis mode. Autorate allows the modem to adjust line speed due to
noise.
Register has the following values:
0 = Enable
1 = Disable
2 = Start at 4800 bps
3 = Start at 9600 bps
Factory setting is Enable.
S77  DTR Alarm Reporting
Register determines whether an alarm is sent to the 6800 Series Network
Management System controller when the DTR signal has been Off for
more than 10 seconds.
Register has the following values:
0 = Disable
1 = Enable
3830-A2-GB91-10
June 1994
4-39
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(12 of 15)
Model 3830 S-Registers
S78  V.32 bis Automode (Dial Line)
If enabled, automode permits the modem to automatically connect to a
remote modem using any supported modulation scheme.
If disabled, the modem only supports the modulation scheme selected by
the S41 register (Dial-Line Rate).
If the modem is in a modem pool attached to a System 85 Private Branch
Exchange (PBX), S78 should be set to 2. This modifies parameters used
during connection to the PBX.
Register has the following values:
0 = Enable
1 = Disable
2 = System 85
Factory setting is Enable.
S80  No Data Disconnect Trigger Signal
Register determines whether Pin 2 (transmit data) or Pin 3 (receive data)
of the modem’s RS-232 serial interface is monitored so that the modem
can disconnect the call if there is no activity for a certain period. (See the
\T command.)
Register has the following values:
0 = Transmit or Receive
1 = Transmit only
2 = Receive only
3 = Transmit and Receive
Factory setting is 3.
4-40
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(13 of 15)
Model 3830 S-Registers
S82  V.32 bis Autorate (Leased Line)
Determines if the Autorate function is used on leased lines when
connected in V.32 bis mode. Autorate allows the modem to adjust line
speed due to noise.
Register has the following values:
0 = Enable
1 = Disable
Factory setting is Enable.
S83  MI/MIC Dialing
Determines if MI/MIC control leads can be used to force the modem into
the originate handshake after first dialing a call.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S84  AT Command Mode
Determines how the modem responds to valid and invalid AT commands.
The selections No ERROR and No Strap or ERROR permit installation
into applications that are customized for a different modem.
Register has the following values:
0 =Normal.
1 =No ERROR. The modem executes all valid commands, ignores invalid
commands, and never issues an ERROR message.
2 =No Strap or ERROR. The modem ignores all configuration
commands, but always issues an OK response message.
Factory setting is Normal.
3830-A2-GB91-10
June 1994
4-41
COMSPHERE 3800 Series Modems – Model 3830
Table 4-3
(14 of 15)
Model 3830 S-Registers
S85  Fast Disconnect
Allows the modem to disconnect immediately after receiving a disconnect
command from a local DTE or its own diagnostic control panel.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S88  Straps When Disconnected
Determines if configuration options in the Active (Saved) configuration
area are loaded to Active (Operating) when the modem disconnects.
Register has the following values:
0 or 231 = No Change
1 or 232 = Reload
Factory setting is No Change.
S89  V.42 ARQ Window Size Increase
Register allows the V.42 Automatic Request for Transmission (ARQ)
window size to be set to a value from 6 to 15 frames to accommodate
satellite delays.
Register has the following values:
0 = 6 frames (default)
1 = 7 frames
2 = 8 frames
3 = 9 frames
D
D
D
D
9 =15 frames
This command applies only to connections made using V.42 bis data
compression or V.42 error control.
Factory setting is 6 frames.
4-42
June 1994
3830-A2-GB91-10
4. AT Command Set and S-Registers
Table 4-3
(15 of 15)
Model 3830 S-Registers
S90  DTE Rate = VF Rate
Register forces the DTE (computer) data rate to be equal to the VF
(telephone line) data rate.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S91  Cellular Enhancements
Register determines whether parameters are set to improve performance
over a cellular link. Should be enabled when the remote modem is using
a cellular connection.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable; &F5 and &F6 set S91 to Enable.
S93  RJ11 Cellular Adapt
Register controls support for an RJ11 connection, including generation of
the ETC 1.1 Calling Tone during call origination.
0 = Disable
1 = Enable
Factory setting is Disable.
3830-A2-GB91-10
June 1994
4-43
COMSPHERE 3800 Series Modems – Model 3830
This page intentionally left blank.
4-44
June 1994
3830-A2-GB91-10
Troubleshooting
A
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Overview
This appendix points out basic problems that can occur when
operating a 3830 modem. Use Tables A-1 through A-5 to check out
these problems. If you are having data communication difficulties,
such as periodic character loss, random errors, or constant format
errors, use the loopback tests associated with the &T command. With
these tests you can usually isolate the fault in your system by using
the process of elimination. If problems continue to occur, contact the
AT&T Paradyne Customer Assistance Center (800-237-0016).
3830-A2-GB91-10
June 1994
A-1
COMSPHERE 3800 Series Modems – Model 3830
Table A-1
Modem Health
Symptom
Action
Modem did not pass
power-up self-test
Contact the AT&T Paradyne Customer
Assistance Center (800-237-0016).
Power LED does
not light
Make sure the modem’s ON/Off switch is in
the ON position.
Make sure the ac power transformer is
connected to the ac power receptacle.
If the Power LED does not operate, contact
the AT&T Paradyne Customer Assistance
Center (800-237-0016).
A problem is suspected
after the power-up
self-test
Perform a self-test using the AT&T9
command.
Perform a local analog loopback with a Pattern
test. If the modem consistently registers
errors contact the AT&T Paradyne Customer
errors,
Assistance Center (800-237-0016).
If the modem passes the above tests and a
problem still exists, then the problem is likely
not with your modem.
A-2
June 1994
3830-A2-GB91-10
A. Troubleshooting
Table A-2
Modem – DTE Connection
Symptom
Action
Modem does not accept
or echo back AT
commands
Verify that the cable between the Async port of
the DTE and the modem is a standard RS-232
cable. If the cable is bad, replace it. (Null
modem cables, also known as crossover
cables, do not work in this application.)
Reload the Async Dial factory configuration
area to guarantee that all configuration options
are returned to their proper setting. Refer to
the Recovering AT Commands section in
Chapter 2.
Make sure that all AT commands are
terminated with a carriage return.
Verify that the DTE has a valid character
format. Valid format consists of 8 data bits with
no parity or 7 data bits with even, odd, mark or
space parity.
Verify that the DTE’s data rate is set to a level
supported by the modem (115,200 bps–300
bps).
If using a PC, verify that the modem is
attached to the correct communications port.
3830-A2-GB91-10
June 1994
A-3
COMSPHERE 3800 Series Modems – Model 3830
Table A-3
(1 of 4)
Modem – VF Connection
Action
Symptom
Modem does not receive
a dial tone
Attach the telephone directly to the wall outlet
to verify that a dial tone exists.
Make sure the VF line is connected to the
modem’s rear jack labeled Dial.
Modem does not go
off-hook and answer an
incoming call
Verify that the Auto-Answer Ring Count
configuration option (S-Register 0) is set to a
value other than 0 (disable).
Verify that the DTE is providing DTR to the
modem.
If the DTE does not provide DTR to the
modem, verify that the modem’s &D command
(DTR Action configuration option) is set for
Ignore (&D0).
Verify that all cables are attached to the
correct connectors on the rear of the modem.
Modem goes off-hook,
answers, but does not
connect
Perform a Local Analog Loopback test and
verify that data entered at the DTE is echoed
back to the DTE.
Verify that the originating modem is
compatible.
Verify that originating modem recognizes your
modem’s answer tone.
A-4
June 1994
3830-A2-GB91-10
A. Troubleshooting
Table A-3
(2 of 4)
Modem – VF Connection
Symptom
Modem goes off-hook,
answers, but does not
connect (continued)
Action
Verify that originating modem supports your
modem’s modulation schemes. The 3830
modem recognizes V.32terbo, CCITT V.32 bis,
V.32, V.22 bis, V.22, V.21, Bell 212A, and Bell
103J. The 3800 Series modem does not
support other vendors’ proprietary modulation
schemes.
Use the S41 register to force your modem to
operate at the same modulation scheme as
the originating modem.
Originate Mode
Verify that the modem’s DTE Dialer
configuration option is set to the correct
setting: either AT, DTR Dialing,
V.25 bis Async,V.25 bis Bisync, or
V.25 bis HDLC.
Modem does not go
off-hook and begin
dialing
If using AT Dialing, refer to the Table A-2,
Modem — DTE Connection.
If using DTR Dialing, verify the telephone
number stored in directory location 1, and
verify that the DTE is raising DTR from Off to
ON to initiate a dial.
If using V.25 bis Async, verify that the correct
character format is set to 7 data bits with even
parity and 1 stop bit, and the carriage return
and line feed are used as command
terminators.
If using V.25 bis Bisync, verify that the correct
character format uses two synchronous
control characters and a start-of-text control
character before the text block and an
end-of-text control character after the text
block.
3830-A2-GB91-10
June 1994
A-5
COMSPHERE 3800 Series Modems – Model 3830
Table A-3
(3 of 4)
Modem – VF Connection
Symptom
Action
Modem does not go
off-hook and begin
dialing (continued)
If using V.25 bis HDLC, verify that the correct
character format uses flag, address, and
control characters before the text block and a
frame sequence check and flag after the text
block.
Modem dials but does
not connect
If the modem is operating behind a PBX, verify
if a 9 and comma are needed before the
telephone number.
Verify whether Tone or Pulse dialing is
needed.
Verify if one modem is configured for Error
Control or Disconnect and the other modem is
configured for no Error Control. Try calling in
Buffer mode.
If both modems use V.32 bis or V.32
modulation, set the modem’s V.32 bis Train
configuration option to Long.
Intermittent disconnects,
high error rates, or
excessive
retransmissions
Use the &T7 command to perform a remote
digital loopback test with pattern test.
Modem establishes and
disconnects a call
You may have a poor VF connection.
Disconnect and dial again.
The remote modem may have encountered an
EC Disconnect, where the modem is
configured to establish a call using error
correction.
If the modems cannot negotiate EC, then a
disconnect occurs.
A-6
June 1994
3830-A2-GB91-10
A. Troubleshooting
Table A-3
(4 of 4)
Modem – VF Connection
Symptom
Modem establishes and
disconnects a call
(continued)
Action
The remote modem may be in a forced Error
Control mode (disconnect if there is no error
control). Reconfigure your modem to
V.42/MNP or Buffer and try again.
Perform a Local Analog Loopback test to
check the modem’s hardware operation.
High error rates occur
when running a local
loopback or self-test.
Incoming rings can cause data errors during a
loopback test. Abort the test, disconnect the
modular VF cord, and restart the test.
Table A-4
Online Operation
Action
Symptom
Data scrambled or
unreadable
Verify that the character format (data bits,
parity, and stop bits) is set to the same value
in both modems.
Missing data during a
transfer
Verify that you are using the same method of
flow control for both the modem and the DTE.
If using XON/XOFF flow control, verify that the
modem’s parity matches the DTE’s parity.
3830-A2-GB91-10
June 1994
A-7
COMSPHERE 3800 Series Modems – Model 3830
Table A-5
Leased-Line Operation
Symptom
Modems do not train-up
on leased lines
Action
Verify that the correct cabling is used for your
application. Refer to Chapter 2 for modem
installation instructions.
Verify that one modem is configured for
Answer mode and the other is configured for
Originate mode.
A-8
June 1994
3830-A2-GB91-10
Technical
Specifications
B
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Technical Specifications
Table B-1 shows the technical specifications for the Model 3830
modem.
Table B-1
(1 of 4)
Model 3830 Technical Specifications
Description
Specifications
APPROVALS (115 Vac,
60 Hz only)
FCC Part 15
Class A
FCC Part 68
Registration Number: (See label on modem)
UL
Listed to UL 1950
CSA
Certified to CSA C22.2 No. 950
DOC CS-02 and CS-03
Certification Number: (See label on modem)
3830-A2-GB91-10
June 1994
B-1
COMSPHERE 3800 Series Modems – Model 3830
Table B-1
(2 of 4)
Model 3830 Technical Specifications
Specifications
COMPATIBILITY
Description
DIAL-LINE MODULATIONS
V.32terbo (19,200, 16,800 bps)
CCITT V.32 bis (14,400, 12,000, 9600, 7200,
4800 bps)
CCITT V.32 (9600, 4800 bps)
CCITT V.22 bis (2400 bps)
CCITT V.22 (1200 bps)
CCITT V.21 (300 bps)
Bell 212A (1200 bps)
Bell 103J (300 bps)
LEASED-LINE MODULATIONS
V.32terbo (19,200, 16,800 bps)
CCITT V.32 bis (14,400, 12,000, 9600, 7200,
4800 bps)
CCITT V.32 (9600, 4800 bps)
FAX MODULATIONS (Optional)
CCITT V.17 (14,400, 12,000, 9600,
7200 bps),
CCITT V.29 (9600, 7200 bps)
CCITT V.27 ter (4800, 2400 bps)
ENVIRONMENT
Operating Temperature
32°F (0°C) to 122°F (50°C)
Relative Humidity
5% to 90% (noncondensing)
Shock and Vibration
Withstands normal shipping
Storage Temperature
– 4°F (– 20°C) to 158°F (70°C)
DTE INTERFACE
25-pin D-subminiature
connector
EIA-232-D/CCITT V.24
AC POWER
REQUIREMENTS
115 Vac ± 10%, 60 Hz
220 – 240 Vac ± 10%, 50 – 60 Hz
B-2
June 1994
3830-A2-GB91-10
B. Technical Specifications
Table B-1
(3 of 4)
Model 3830 Technical Specifications
Specifications
POWER
CONSUMPTION
Description
5.25 watts (typical, including power
transformer, speaker off)
DIMENSIONS
Weight
2.5 pounds (1.14 kg) (not including power
transformer)
Height
2.1 inches (5.4 cm)
Width
7.6 inches (19.4 cm)
Depth
12.1 inches (30.8 cm)
TRANSMIT LEVEL
Dial Line
Permissive (–9 dBm)
Programmable (transmit level defined by
TELCO)
Leased Line
0 through –15 dBm (in 1 dBm decrements)
TELEPHONE
INTERFACE
Dial-Line Connectivity
RJ11C Permissive
RJ45S Programmable
Leased-Line Connectivity
6-pin center pair leased jack
(For JM8 connection, refer to Appendix C
for JM8 conversion cable pinouts.)
VOICE FREQUENCY
LINE REQUIREMENTS
2-wire dial (PSTN) or 2-wire leased line
3830-A2-GB91-10
June 1994
B-3
COMSPHERE 3800 Series Modems – Model 3830
Table B-1
(4 of 4)
Model 3830 Technical Specifications
Specifications
Description
DATA RATES
Dial Line
19,200, 16,800, 14,400, 12,000, 9600, 7200,
4800, 2400, 1200, or 300–0 bps.
Leased Line
19,200, 16,800, 14,400, 12,000, 9600, 7200,
or 4800 bps
Fax
14,400, 12,000, 9600, 7200, 4800, or
2400 bps
DTE
115,200–300 bps
ERROR CONTROL
CCITT V.42
MNP 4-2
DATA COMPRESSION
CCITT V.42 bis
MNP Class 5
B-4
June 1994
3830-A2-GB91-10
Pin Assignments
C
EIA-232-D Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
VF Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
EIA-232-D Pin Assignments
Table C-1 lists the EIA-232-D pin assignments for the modem.
Table C-1
(1 of 3)
EIA-232-D Pin Assignments
RS-232
Pin
Name
EIA
Circuit
CCITT
Signal
Source
1
–
AA
101
–
2
TXD
BA
103
DTE
Transmit Data
3
RXD
BB
104
DCE
Receive Data
4
RTS
CA
105
DTE
Request-to-Send
5
CTS
CB
106
DCE
Clear-to-Send
6
DSR
CC
107
DCE
Data Set Ready
7
SG
AB
102
–
8
LSD
CF
109
DCE
3830-A2-GB91-10
June 1994
Circuit
Function
Shield
Signal Ground
Line Signal
detect
C-1
COMSPHERE 3800 Series Modems – Model 3830
Table C-1
(2 of 3)
EIA-232-D Pin Assignments
RS-232
Pin
Name
EIA
Circuit
CCITT
Signal
Source
Circuit
Function
9
+10V
–
–
–
Reserved for
test purposes
(may be used to
drive one
RS-232 load)
10
–10V
–
–
–
Reserved for
test purposes
(may be used to
drive one
RS-232 load)
11
–
–
–
–
Unassigned
12
CT112
CI
112
DCE
13
–
–
–
–
Reserved for
future function
14
–
–
–
–
Reserved for
future function
15
TXC
DB
114
DCE
Transmit Clock
16
–
–
–
–
Reserved for
future function
17
RXC
DD
115
DCE
Receive
Clock 18
18
CT141
LL
141
DTE
Local Loopback
20
DTR
CD
108
DTE
Data Terminal
Ready
21
CT140
RL
140
DTE
Remote
Loopback
C-2
June 1994
Data Signal Rate
Select
3830-A2-GB91-10
C. Pin Assignments
Table C-1
(3 of 3)
EIA-232-D Pin Assignments
RS-232
Pin
Name
EIA
Circuit
CCITT
Signal
Source
22
R1
CE
125
DCE
Ring Indicator
23
CT111
CH
111
DTE
Data Rate
Selector
24
XTXC
DA
113
DTE
External Clock
25
TEST
TM
142
DCE
Test Mode
Circuit
Function
VF Connector Pin Assignments
For 2-wire leased-line connections to a JM8 network interface, an
8-position to 6-position conversion cable (see Figure C-1) must be
used according to the following FCC requirements:
‘‘The RJ series of jacks should not be used for connecting data
equipment to nonswitched private line networks – specifically, the
service equivalents of the pre-divestiture Series 3002 (Category II,
Tariff #260) service. There is a substantial difference in transmit
levels permitted in the private line service and those permitted in
the public switched network. The industry standard is now an 8-pin
keyed modular jack known as the USOC JM8 (Bellcore Technical
Reference: TR-EOP-000242, Issue 1, released May 1985.) When
ordering the installation of the USOC JM8, specify the appropriate
wiring options:
(1) 2-wire operations
(2) 4-wire operations w/o TEK leads
(3) 4-wire operations with TEK leads
TEK leads are for loopback purposes.
A 50-pin version is being considered for multiple line
connections.”
3830-A2-GB91-10
June 1994
C-3
COMSPHERE 3800 Series Modems – Model 3830
The Model 3830 provides the 2-wire leased-line signals on the same
leads used for Tip and Ring when in Dial mode. To connect the
modem to a standard JM8 leased-line jack, a conversion cable
(125-0054-1531) must be used. Note that for 2-wire leased-line
operation, the yellow and black leads are not used.
The wiring of this cable is illustrated in Figure C-1.
Figure C-1. Wiring Diagram – 8-Position to
6-Position Conversion Cable
C-4
June 1994
3830-A2-GB91-10
C. Pin Assignments
Table C-2 illustrates the connector pin assignments for Model 3830
modular jacks as well as the pin assignments for the leased-line jacks.
Table C-2
VF Connector Pin Assignments for Leased Lines
Type Of
Leased-Line Jack
Model 3830
Phone
Connector
(J6)
Model 3830
Line
Connector
(J7)
1
–
–
Ring 1
Not Used
1
2
–
–
Tip 1
Not Used
2
3
–
Mode
Indication
Loopback
Indication
Tip 1
3
4
Phone-Ring
2-wire leased
line/Dial-Ring
Not Used
Ring
4
5
Phone-Tip
2-wire leased
line/Dial-Tip
Not Used
Tip
5
6
–
Mode
Indication
Common
Loopback
Indication
Ring 1
6
7
–
Program
Resistor
Tip
Not Used
8
–
Program
Resistor
Common
Ring
Not Used
Connector
Pin No.
6-pin/8-pin
JM8
6-pin
Center
Pair
Leased
The feature/part number for an 8-position to 6-position conversion
modular cord is 125-0054-1531.
3830-A2-GB91-10
June 1994
C-5
COMSPHERE 3800 Series Modems – Model 3830
This page intentionally left blank.
C-6
June 1994
3830-A2-GB91-10
CCITT V.25 bis
Dialing Commands
and Response
D
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Request Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Request with Number Provided (CRN) . . . . . . . . . . . . . . . . . . . . . . .
Call Request with Stored Memory Address Provided (CRS) . . . . . . . . . .
Call Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Failure Indication (CFI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Connecting (CNX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Answer Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Incoming Call (INC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disregard Incoming Call (DIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Incoming Call (CIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Normal (PRN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Request List of Stored Numbers (RLN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List Stored Number Response (LSN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valid (VAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Invalid (INV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1
D-2
D-3
D-3
D-3
D-4
D-4
D-5
D-5
D-5
D-5
D-6
D-6
D-6
D-7
D-7
D-7
Overview
CCITT V.25 bis is an international dialing protocol that permits direct
and stored number dialing using DTEs in either Asynchronous,
Bisynchronous, or HDLC operating mode. The Model 3830 modem
supports V.25 bis request and answer commands that initiate and
cancel dialing, program commands that allow you to create and enter
telephone numbers to memory, and list commands that display all
telephone numbers stored in directory locations. As commands are
entered from the DTE, the 3800 Series modems issue a response to
the DTE which indicates if the call failed or connected, or if the
command is valid or invalid.
3830-A2-GB91-10
June 1994
D-1
COMSPHERE 3800 Series Modems – Model 3830
The following section discusses those V.25 bis commands supported
by the Model 3830 modem and the responses to those commands.
Tables D-1 and D-2 in the Command Response section list the
V.25 bis command and response and the analogous AT command.
NOTE
The Model 3830 modem must be configured for
V.25 bis dialing. Refer to the &M or &Q commands
listed in Chapter 4.
NOTE
The character format for Asynchronous Dialing
mode is 7 data bits, even parity, and 1 stop bit.
The character format for Bisynchronous Dialing
mode is 7 data bits, odd parity, and 1 stop bit.
The character format for HDLC Dialing mode can
be 8 data bits, no parity, and 1 stop bit; 7 data bits,
odd parity, and 1 stop bit; or 7 data bits, even
parity, and 1 stop bit.
Character format is determined by the DTE. The
modem detects this format when an AT prefix is
entered from the DTE.
Call Request Commands
Call Request commands are issued from the DTE to the modem and
are responsible for initiating any dial calls. Call Request commands
include Call Request with Number Provided (CRN), Call Request
with Stored Memory Address Provided (CRS).
D-2
June 1994
3830-A2-GB91-10
D. CCITT V.25 bis Dialing Commands and Response
Call Request with Number Provided (CRN)
The CRN command dials the telephone number entered from the
DTE. CRN is similar to the ATD command.
The CRN command format is:
CRNn
Where:
n is the dial string. The following characters are
permitted:
T
P
0–9
*#ABCD
R
:
, or <
&
= or >
DTMF Dialing
Pulse Dialing
DTMF Tones or Pulse Dialed Digits
DTMF Tones
Reverse Dial
Wait for Dial Tone
User-Defined Pause
Flash Hook
Delimiters
Call Request with Stored Memory Address Provided (CRS)
The CRS command dials the telephone number stored in the request
directory location. CRS is similar to the ATDS command.
The CRS command format is:
CRSx
Where:
x is directory location 1–10.
The modem responds to the command with either a VAL (valid) or
INV (invalid) response followed by a call progress report such as
connect (CNX) or failure (CFI).
Call Response
A Call Response indicates if the command was accepted by the
modem. Call Response includes Call Failure Indication (CFI) and
Call Connecting (CNX).
3830-A2-GB91-10
June 1994
D-3
COMSPHERE 3800 Series Modems – Model 3830
Call Failure Indication (CFI)
The CFI response is issued to the DTE if the modem fails a CRN or
CRS command. CFI is similar to the AT result codes BUSY, NO
ANSWER, NO CARRIER, NO DIALTONE, and ERROR.
The CFI response format is:
CFIxx
Where:
xx is
ET
NS
CB
RT
AB
NT
FC
Engaged tone
Number not stored
Local DCE busy
Time-out on ring tone
Abort call on time-out
Answer tone not detected
Forbidden call
ET is similar to the Call Failure Messages Busy Signal and Trunk
Busy and the result code BUSY.
NS is similar to the Common Operational Message Invalid Number
and the result code ERROR.
CB is similar to the Call Failure Messages Dial Line in Use and No
Dial-Test and the result code ERROR.
RT is similar to the Call Failure Message No Answer Tone and the
result code NO CARRIER.
AB is similar to the Call Failure Messages No Dial Tone and No
Dial-DTR and the result code NO DIALTONE and ERROR.
NT is similar to the Call Failure Message No Quiet Answer and the
result code NO ANSWER.
Call Connecting (CNX)
The CNX response informs the DTE that the modem has connected to
the remote modem. CNX is similar to the AT result code CONNECT.
The CNX response format is CNX.
D-4
June 1994
3830-A2-GB91-10
D. CCITT V.25 bis Dialing Commands and Response
Call Answer Commands
Call Answer commands disable or enable the modem’s AutoAnswer
function. These commands are issued from the DTE. Call Answer
commands include Incoming Call (INC), Disregard Incoming Call
(DIC) and Connect Incoming Call (CIC).
Incoming Call (INC)
The INC response informs the DTE that the modem has detected a
ring tone. At this point, the DTE can issue the DIC command to
disable the modem from answering the call. INC is similar to the AT
result code RING.
Disregard Incoming Call (DIC)
The DIC command prevents the modem from answering an incoming
call. This command is only valid once the DTE receives an incoming
call (INC) response from the modem. A DIC must be issued within 5
seconds after receiving an INC.
The DIC command format is DIC.
If DIC is issued within 5 seconds, the modem sends the VAL response
to the DTE. If DIC is issued after 5 seconds, INV is returned.
Connect Incoming Call (CIC)
The CIC command forces the modem to cancel any DIC commands
and answer an incoming call. This command is only valid when the
DTE issues a DIC command. CIC must be issued within 10 seconds
after sending a DIC. CIC is similar to the ATA command.
The CIC command format is CIC.
If CIC is issued within 10 seconds, the modem sends the VAL
response to the DTE. If CIC is issued after 10 seconds, INV is
returned.
3830-A2-GB91-10
June 1994
D-5
COMSPHERE 3800 Series Modems – Model 3830
Program Normal (PRN)
The Program Normal (PRN) command allows the DTE to enter and
store a telephone number to a specific directory location. PRN is
similar to the AT&Z command.
The PRN command format is:
PRNx;n
Where:
x is the directory location 1–10;
n is the telephone number.
Request List of Stored Numbers (RLN)
The Request List of Stored Numbers (RLN) command displays
telephone numbers stored in the modem’s directory location. If the
RLN command is entered without specifying a directory location,
then all directory locations and telephone numbers are displayed. If a
directory location is entered, then only that telephone number is
displayed.
The RLN command format is:
RLN
which displays all directory locations, or:
RLNx
Where:
x is a directory location.
List Stored Number Response (LSN)
LSN is a response to an RLN command issued by the DTE. If a
directory location is specified, then the telephone number for that
location is displayed. If no directory location is specified, then all
telephone numbers stored in memory are displayed.
The LSN response format is:
LSNx;n
Where:
D-6
x is the directory location.
n is the telephone number.
June 1994
3830-A2-GB91-10
D. CCITT V.25 bis Dialing Commands and Response
Command Response
A Command Response indicates that the command entered was a
valid or invalid entry. Command Response includes Valid (VAL) and
Invalid (INV).
Valid (VAL)
The VAL response indicates that the modem has accepted the V.25 bis
command issued by the DTE. VAL is similar to the AT result code
OK.
Invalid (INV)
The INV response indicates that the modem has received an incorrect
V.25 bis command from the DTE. INV is similar to the AT result code
ERROR.
The INV response format is:
INVxx
Where:
xx is
CU
MS
PS
PV
command unknown
message syntax error
parameter syntax error
parameter value error
Table D-1 lists V.25 bis commands supported by the Model 3830
modem.
3830-A2-GB91-10
June 1994
D-7
COMSPHERE 3800 Series Modems – Model 3830
Table D-1
V.25 bis Commands
V.25 bis
Command
Description
AT Command/
S-Register
Equivalent
CALL REQUEST COMMANDS
CRN
Call Request with Number Provided
ATD
CRS
Call Request with Memory Address
ATDS
CALL ANSWER COMMANDS
INC
Incoming Call Indication
RING
DIC
Disregard Incoming Call
NONE
CIC
Connect Incoming Call
ATA
PROGRAM COMMAND
PRN
Program Normal
AT&Z
LIST REQUEST
RLN
D-8
Request to List Stored Number
June 1994
NONE
3830-A2-GB91-10
D. CCITT V.25 bis Dialing Commands and Response
Table D-2 lists V.25 bis response messages supported by the
Model 3830 modem.
Table D-2
V.25 bis Response Messages
V.25 bis
Command
Description
AT Command/Result
Code Equivalent
CALL RESPONSE
CFI
Call Failure Indication
BUSY, NO ANSWER,
NO CARRIER, NO
DIAL TONE, ERROR
CNX
Call Connecting
Indication
CONNECT
LIST RESPONSE
LSN
List Stored Number
NONE
COMMAND RESPONSE
VAL
Valid Command
OK
INV
Invalid Command
ERROR
3830-A2-GB91-10
June 1994
D-9
COMSPHERE 3800 Series Modems – Model 3830
This page intentionally left blank.
D-10
June 1994
3830-A2-GB91-10
Glossary
Active (Operating)
A configuration area containing configuration
options currently in use by the modem. When a
power cycle occurs, a reset is performed, or a
save is issued, this area is updated with the
contents of Active (Saved).
Active (Saved)
A nonvolatile configuration area containing the
most recently saved configuration options. Any
changes made to configuration options can be
saved by issuing an AT&W0 command.
analog loop
See local analog loop.
analog signal
A signal, such as a voice, that varies
continuously.
Answer mode
The modem is in a state where it is ready to
receive an incoming call. For example, an ATA
(Answer) command has been issued to place the
modem into online answer mode. The modem
has been forced off-hook and is generating an
answer tone, beginning the handshaking process
with the calling modem.
ASCII
This code (American Standard Code for
Information Interchange) is a 7-bit code which
establishes compatibility between data services.
ASCII is the standard for data transmission over
telephone lines. The ASCII code consists of
32 control characters (nondisplayed) and
96 displayed characters.
Async Dial
A factory preset configuration area containing the
configuration options most often used in
asynchronous dial networks.
3830-A2-GB91-10
June 1994
Glossary-1
COMSPHERE 3800 Series Modems – Model 3830
asynchronous
transmission
A data transmission that is synchronized by a
transmission start bit at the beginning of a
character (five to eight bits) and one or more stop
bits at the end.
AT command set
A group of commands, issued from an
asynchronous DTE, that allow control of the
modem while in Command mode. All commands
must begin with the characters AT and end with a
carriage return.
AT prefix
A prefix issued before every AT command
(except A/ and +++) which identifies the DTE’s
data rate, parity, and character length.
autobaud
Modem automatically determines the
asynchronous DTE data rate when using AT
commands.
automatic answer
A capability to respond to a call received over a
dial line.
baud
A unit of signaling speed that is equal to the
number of symbols per second. This is not
necessarily the same as bits per second, although
the terms are frequently interchanged.
Bisync
Binary Synchronous Communications. An IBMr
communications protocol that has become an
industry standard. It uses a defined set of control
characters and control character sequences for
synchronized transmission of binary-coded data
between stations in a data communications
system.
bit
A contraction of binary digit. A bit, which is the
smallest unit of information, represents a one or a
zero (sometimes called mark or space).
bps
Bits per second. Indicates the speed at which bits
are transmitted across a data connection.
Glossary-2
June 1994
3830-A2-GB91-10
Glossary
buffer
A storage device used to compensate for
differences in the data flow rate when
transmitting data from one device to another.
byte
A sequence of successive bits (usually eight)
handled as a unit in data transmission.
CCITT
An advisory committee (Consultative Committee
on International Telephone and Telegraph)
established by the United Nations to recommend
communications standards and policies.
CCITT V.17
A fax communications standard for modems
operating half-duplex with synchronous data at
14,400 bps.
CCITT V.22
A standard for modems operation full-duplex
with asynchronous or synchronous data at
1200 bps over the dial network (PSTN).
CCITT V.22 bis
A standard for modems operating full-duplex
with asynchronous or synchronous data at
1200 or 2400 bps over the dial network (PSTN).
CCITT V.25 bis
A dialing protocol that permits direct and
stored-number dialing in asynchronous,
bisynchronous, or HDLC modes.
CCITT V.27 ter
A fax communications standard for modems
operating half-duplex with synchronous data at
2400 and 4800 bps.
CCITT V.29
A fax communications standard for modems
operating half-duplex with synchronous data at
7200 and 9600 bps.
CCITT V.32
A standard for modems operating full-duplex
with asynchronous or synchronous data at
4800 or 9600 bps on switched (dial) or leased
telephone lines.
3830-A2-GB91-10
June 1994
Glossary-3
COMSPHERE 3800 Series Modems – Model 3830
CCITT V.32 bis
A standard for modems operating full-duplex
with asynchronous or synchronous data over dial
networks (PSTN) or leased lines at 14,400,
12,000, 9600, 7200, or 4800 bps.
CCITT V.42
CCITT standard for error control protocol.
CCITT V.42 bis
CCITT standard for data compression.
CCITT V.54
CCITT standard for local and remote diagnostic
loopback tests.
character
A letter, figure, number, punctuation, or other
symbols.
character echo
A way to check the accuracy of data transmission
by sending (displaying) all the characters being
transmitted to the monitor.
Class 1 fax
A fax modem standard. Under Class 1 computer
software handles most of the protocol,
compression, and conversion tasks.
Class 2 fax
A fax modem standard. Under Class 2 the
modem handles most of the protocol,
compression, and conversion tasks as well as
modulation, leaving the computer free for other
work.
command line
Contains the command(s) instructing the modem
to perform a function. Command lines begin with
the AT prefix (unless disabled), and are executed
when you press the Return key.
Command mode
One of two general modem operating modes.
When in Command mode, the modem accepts
commands instead of transmitting or receiving
data.
configuration option
Modem software that sets specific operating
parameters for the modem. Sometimes referred to
as straps.
Glossary-4
June 1994
3830-A2-GB91-10
Glossary
connector
An outlet on equipment and cables that provides
a connection.
CSA
Canadian Standards Association.
CTS
Clear-to-Send. A signal indicating that the
modem is ready for the DTE to transmit data.
Customer 1
A user-defined configuration area containing
customized configuration options for a specific
application.
Customer 2
A user-defined configuration area containing
customized configuration options for a specific
application.
data carrier
A continuous frequency signal that can be
modulated by another signal that contains
information to be transmitted.
data compression
The elimination of empty fields, redundancies,
and gaps in order to reduce storage capacity
needs and the amount of data to be transmitted.
Anything that is eliminated is restored after the
data is received.
Data mode
One of two general modem operating modes.
When in Data mode, the modem transmits and
receives data instead of accepting commands.
DB-25 connector
A 25-pin connector that is used to connect a
cable which enables communications between
two devices.
dBm
A decibel referenced to one milliwatt. This unit
measures relative signal power.
DCE
The equipment (Data Communications
Equipment or Data Circuit Terminating
Equipment) that provides the functions required
to establish, maintain, and end a connection. This
equipment also provides the signal conversion
required for communication between the DTE
and the telephone line. A modem is a DCE.
3830-A2-GB91-10
June 1994
Glossary-5
COMSPHERE 3800 Series Modems – Model 3830
demodulation
The process of recovering data from a modulated
carrier wave.
dial command modifiers
A modifier used in the dial string that instructs
the modem how to process a dialed telephone
number.
dial line
A communications circuit that is established by a
switched circuit connection in the dial network.
dial network
See PSTN.
dial string
A series of characters that consists of numbers
and modifiers used to dial a telephone number.
digital signal
A signal composed of only two discrete values,
representing the binary digits 0 and 1.
directory location
Nonvolatile memory that stores up to ten
telephone numbers. Each directory location can
have up to 40 characters entered.
DOC
Canadian Department of Communication.
download
A process that transfers modem firmware from a
locally attached PC to a modem or allows the
cloning of firmware from a local modem to a
remote modem. Also, the process of moving data
from a host computer to an attached computer.
DTE
The equipment (Data Terminal Equipment), such
as a computer or terminal, that provides data in
the form of digital signals.
EIA
Electronic Industries Association. This
organization provides standards for the data
communications industry.
EIA-232-D
An Electronic Industries Association’s standard
defining the 25-position interface between data
terminal equipment and data communications
equipment.
Glossary-6
June 1994
3830-A2-GB91-10
Glossary
EIA RS-366-A
An Electronic Industries Association’s standard
defining the 25-position interface between data
terminal equipment and data communications
automatic calling equipment.
EPROM
Erasable programmable read-only memory.
error control
An algorithm used to correct data transmission
errors.
escape sequence
Default setting is +++. This sequence lets you
switch your modem from Data mode to
Command mode.
extended result codes
An asynchronous message (in either numbers or
words) that includes VF data rate and error
control information the modem sends to the DTE
after executing or trying to execute a command.
fax modem
A modem capable of emulating some features of
a fax machine. Working under the control of fax
software, a fax modem can communicate with a
fax machine or with another fax modem.
fax software
A program or system of programs installed on a
computer that allow a fax modem to send and
receive facsimile images.
FCC
Federal Communications Commission. Board of
Commissioners that regulates all interstate and
foreign electrical communication systems that
originate from the United States.
full-duplex
Simultaneous, two-way communications.
Group III
A fax standard that specifies a rate of
transmission of about one page per minute.
half-duplex
Two-way data communications allowed in only
one direction at a time.
3830-A2-GB91-10
June 1994
Glossary-7
COMSPHERE 3800 Series Modems – Model 3830
handshaking
The exchange of predetermined codes and signals
(tones) to establish a connection between two
modems.
host
A computer attached to a network that shares its
information and devices with the rest of the
network.
HDLC
High-Level Data Link Control. A
communications protocol defined by ISO.
Hz
A unit of frequency (hertz) that equals one cycle
per second.
JM8
A jack used for leased-line networks. Pins 1 and
2 are the transmit pair and Pins 7 and 8 are the
receive pair.
leased line
A private line connection exclusively for the user.
No dialing is necessary.
LED
Light-Emitting Diode. A light or status indicator
on the DCP that glows in response to the
presence of a certain condition (e.g., Alrm).
local analog loopback
The modem’s transmit VF signal is looped to its
receiver.
long space disconnect
A disconnect can occur if the modem receives an
extended space from a remote modem; for
example, when a remote modem is commanded
to disconnect, it transmits a continuous space to
the modem before disconnecting.
loopback test
Any test that verifies a device’s integrity by
connecting the device’s output of one direction to
the device’s input of the other direction, then
checking the received signal for errors.
LSD
Line Signal Detect. A signal between the DTE
and modem indicating energy exists on the
transmission circuit.
Glossary-8
June 1994
3830-A2-GB91-10
Glossary
MNP
This protocol (Microcom Networking Protocol)
detects and corrects data errors caused by
telephone line noise and signal distortion. MNP5
includes data compression.
modem
(Modulator/DEModulator). A device that
transforms signals from digital to analog form
and vice versa.
modulation
The process of varying some characteristics
(usually amplitude, frequency, and/or phase) of a
carrier wave to form data transmissions.
off-hook
A telephone or modem is being used.
on-hook
A telephone or modem is not being used.
Originate mode
The modem is in a state where it is ready to
transmit a call. In a dial network, it is the modem
that makes the call. In a leased-line network, it is
one of two sides of the network that is selected to
be the originating modem.
parity
A way of checking data accuracy by counting the
number of bits that have a value of one.
PBX
Telephone switching equipment (Private Branch
Exchange) dedicated to one customer. A PBX
connects private telephones to each other and to
the public dial network.
permissive interface
A dial modem operating mode characterized by a
fixed output power level of –9 dBm. It is one of
two possible modes of operation for modems
connected to dial lines (see programmable
interface).
power-up self-test
A test that checks most hardware components
when the modem is powered-on.
3830-A2-GB91-10
June 1994
Glossary-9
COMSPHERE 3800 Series Modems – Model 3830
programmable interface
A dial modem operating mode characterized by
an output power level (–12 to 0 dBm) set by a
programming resistor in the jack. It is one of two
possible modes of operation for modems
connected to dial lines (see permissive interface).
product code
A three-digit code indicating the modem’s
highest VF data rate.
protocol
The rules for timing, format, error control, and
flow control during data transmission.
PSTN
Public Switched Telephone Network. A network
shared among many users who can use
telephones to establish connections between two
points. Also known as dial network.
pulse dialing
One of two dialing methods, in which telephone
numbers are sent as pulses (brief changes in
voltage or current intensity) across the telephone
line. Rotary telephones use pulse dialing.
register
A part of the modem’s memory that contains
values that determine the modem’s operating
characteristics.
remote loopback
A test that sends a signal to the remote modem to
test the local modem, the remote modem, and the
circuit between them.
result code
An asynchronous message (in either numbers or
words) that the modem sends to the DTE after
executing or trying to execute a command.
RJ11
A type of 6-position jack normally used with
permissive dial networks and telephone sets.
rotary
A TELCO service whereby multiple lines to a
customer premise share a common telephone
number.
S-Registers
Registers that contains information affecting the
modem parameters. All S-Registers must be
preceded by the AT prefix.
Glossary-10
June 1994
3830-A2-GB91-10
Glossary
serial transmission
A way of transmitting data in which bits are sent
sequentially one at a time.
Sync Dial
A factory preset configuration area containing
configuration options most often used in
synchronous dial networks.
synchronous transmission
Data transmission that is synchronized by timing
signals. Characters are sent at a fixed rate. This
type of transmission is more efficient than
asynchronous transmission.
tone dialing
One of two dialing methods, in which telephone
numbers are sent as tones across the telephone
lines.
training
A process where two modems try to establish a
connection over the VF line.
UL
Underwriter’s Laboratories, Inc.
UNIX Dial
A factory preset configuration area containing the
configuration options most often used in a
UNIXr dial network.
USOC
Universal Service Ordering Codes.
VF
Voice Frequency. The part of the audio
frequency range used to transmit voice sound
(usually 300 Hz to 3400 Hz). This band is used
by the modem for its modulated signal.
XOFF
A character that tells the DTE or modem to stop
transmitting data.
XON
A character that tells the DTE or modem to start
or resume transmitting data.
3830-A2-GB91-10
June 1994
Glossary-11
COMSPHERE 3800 Series Modems – Model 3830
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Glossary-12
June 1994
3830-A2-GB91-10
Index
A
A/ (Repeat Last Command), 4-7
ac power, 2-5
Answer mode (ATA), 4-7
Async/Sync Mode (AT&M), 4-18
AT Commands
“H (V.42 bis Compression), 4-28
&C (LSD Control), 4-14
&D (DTR Action), 4-15
&F (Factory Defaults), 4-15
&G (V.22 bis Guard Tone), 4-16
&I (Dial Transmit Level), 4-17
&J (Dial Transmit Type), 4-17
&L (Leased Mode), 4-17
&M (Async/Sync Mode and DTE Dialer Type),
4-18
&Q (Async/Sync Mode and DTE Dialer Type),
4-18
&R (RTS Action), 4-19
&S (DSR Control), 4-20
&T (Tests), 4-21
&V (View Configuration Options), 4-22
&W (Write to Memory), 4-22
&X (Transmit Clock Source), 4-22
&Z (Store Telephone Number), 4-23
%A (Error Control Fallback Character), 4-27
%C (MNP5 Data Compression), 4-27
*** (Command Recovery), 4-7
\A (Maximum Frame Size), 4-23
\C (Error Control Negotiate Buffer), 4-24
\D (CTS Control), 4-24
\G (Modem to Modem Flow Control), 4-24
\K (Break Buffer Control, Send Break Control,
Break Forces Escape), 4-25
3830-A2-GB91-10
June 1994
Index-1
COMSPHERE 3800 Series Modems – Model 3830
\N (Error Control Mode), 4-26
\Q (Flow Control of DTE and Modem), 4-26
\T (No Data Disconnect Timer), 4-27
\X (XON/XOFF Passthrough Flow Control),
4-27
A (Answer Mode), 4-7
D (Dial), 4-8
DS (Dial Stored Number), 4-9
E (Command Echo), 4-9
H (Hook Switch Control), 4-9
I (Identification), 4-10
L (Speaker Volume), 4-10
M (Speaker On/Off), 4-10
O (Online Mode), 4-10
Q (Result Codes), 4-11
recovering use of, 2-9
Sn? (Display S-Register), 4-11
Sn=r (Change S-Register), 4-11
V (Result Codes Format), 4-11
X (Extended Result Code, Dial Tone Detect,
Busy Tone Detect), 4-12
Y (Long Space Disconnect), 4-13
Z (Reset and Load Active), 4-13
AT Command Mode (S84), 4-41
AT commands, 4-6
AT&T exclusive dialing, 2-12
Auto Redial (S37), 4-32
auto-answer problems, A-4
automode (S78), 4-40
autorate
S76 Dial Line, 4-39
S82 Leased Line, 4-41
B
Index-2
blind dial pause (S6), 4-30
blind dialing, 4-12
Break Buffer Control (AT\K), 4-25
Break Forces Escape (AT\K), 4-25
busy tone detect (ATX), 4-12
June 1994
3830-A2-GB91-10
Index
C
D
3830-A2-GB91-10
Call Answer commands (V.25 bis), D-5
Call Request commands (V.25 bis), D-2
Call Response (V.25 bis), D-3
Call Waiting, 4-8
cellular enhancements
&F5 and &F6 commands, 4-15
S91 Register, 4-43
cellular transmit level, 4-17
change S-Register, 4-11
character format, 4-3
problems, A-3, A-7
clock source (AT&X), 4-22
command echo, 4-9, A-3
Command mode, 4-1
Command Response (V.25 bis), D-7
compression
MNP5, 4-27
V.42 bis, 4-28
COMSPHERE 6700 Series NMS, 1-2
configuration options
factory default, 2-7
factory defaults (AT&F), 4-15
loading (ATZ), 4-13
loading when disconnected (S88), 4-42
saving (AT&W), 4-22
selecting, 2-7
viewing (AT&V), 4-22
connect problems, A-4, A-6
CT111 Rate Control (S61), 4-36
CTS Control (\D), 4-24
Data mode, 4-1
DATAKIT applications, 2-12, 4-18
Dial (ATD), 4-8
dial command modifiers, 4-8
Dial Line Rate (S41), 4-33
dial modifier (‘‘,’’) (Pause), 4-8
Dial Stored Number (ATDS), 4-9
dial tone detect (ATX), 4-12
June 1994
Index-3
COMSPHERE 3800 Series Modems – Model 3830
dial tone wait, 4-8
dial-line connection, 2-4
dialing problems, A-5
Directory Location 1 Callback (S67), 4-38
Disconnect Delay
Receive Buffer, 4-33
Transmit Buffer, 4-35
display
configuration options, 4-22
S-Register, 4-11
DSR Control (AT&S), 4-20
DTE connection, 2-4
DTE Rate
CT111 Rate Control, 4-36
problems, A-3
set to VF rate, 4-43
DTE rate, in result codes, 4-12
DTR
Alarm Reporting (S77), 4-39
make busy via (S69), 4-38
DTR Action (AT&D), 4-15
E
echo command, 4-9
EIA-232-D cable, 2-2
EIA-232-D pin assignments, C-1
Enhanced Throughput Cellular, 4-17
Enhanced Throughput Cellular (ETC), 4-15
equipment provided by customer, 2-2
equipment supplied, 2-1
Error Control Fallback Character (AT%A), 4-27
Error Control Mode (AT\N), 4-26
Error Control Negotiate Buffer (AT\C), 4-24
Escape Guard Time, 4-2, 4-31
escape sequence (+++), 4-1, 4-2, 4-29
ETC (Enhanced Throughput Cellular) 4-17, 4-43
extended result codes (ATX), 4-12
Index-4
June 1994
3830-A2-GB91-10
Index
F
Fast Disconnect, 4-42
fax
Class 2, 3-1
EIA/TIA-592 standard, 3-1
operation, 3-1
software settings, 3-2
features, 1-2
ferrite choke
on DTE cable, 2-4
on power transformer cable, 2-6
firmware revision number, 4-10
flow control
AT\Q command, 4-26
DTE to modem, 4-26
modem to DTE, 4-26
modem to modem, 4-24
problems, A-7
frame size (\A), 4-23
front panel, 1-3
H
hang up (ATH), 4-9
Hayes AutoSync, 4-18
hook flash (!), 4-9
Hook Switch Control (ATH), 4-9
I
Identification (ATI), 4-10
initialization strings, 2-11
DATAKIT, 2-12
synchronous leased-line applications, 2-11
V.25 bis applications, 2-11
installation
Model 3830 modem, 2-2
software, 2-6
3830-A2-GB91-10
June 1994
Index-5
COMSPHERE 3800 Series Modems – Model 3830
L
Leased Line Carrier On Level (S48), 4-35
Leased Line Rate, 4-34
Leased Line Transmit Level (S45), 4-34
Leased Mode (AT&L), 4-17
leased-line connection, 2-5
leased-line problems, A-8
LEDs (front panel), 1-3
Line Current Disconnect (S65), 4-38
load Active (Operating) area, 4-13
LSD Control (AT&C), 4-14
M
MI/MIC Dialing, 4-41
MNP5 Data Compression (AT%C), 4-27
Model 3830 modem
commands, 4-6
description, 1-1
features, 1-2
operating modes, 4-1
result codes, 4-4
S-Registers, 4-28
modulation problems, A-5
modulations supported, B-2
N
NMS (COMSPHERE 6700 Series NMS), 1-2
No Carrier Disconnect (S10), 4-30
No Data Disconnect Trigger Signal, 4-40
O
115V power transformer, 2-5
operating modes, 4-1
Index-6
June 1994
3830-A2-GB91-10
Index
P
Pause Time (‘‘,’’) (S8), 4-29
P (Pulse dial), 4-8
pin assignments
RS-232, C-1
VF connector, C-3
Power LED, A-2
power-up procedure, 2-6
Q
quiet answer (@), 4-9
R
R (Reverse dial), 4-9
Rate Auto Originate (S36), 4-32
Rate Control (CT111), 4-36
recovering use of AT commands, 2-9
remote access (S55), 4-36
Repeat Last Command (A/), 4-7
reset (ATZ), 4-13
Result Code Control (ATQ), 4-11
result codes, 4-4
extended, 4-12
Result Codes Format (ATV), 4-11
return to command mode (‘‘,’’), 4-9
return to Online mode (ATO), 4-10
ring number (S0), 4-29
RJ11 Cellular Adapt (S93), 4-43
RTS Action (&R), 4-19
RTS-to-CTS Delay (S26), 4-31
3830-A2-GB91-10
June 1994
Index-7
COMSPHERE 3800 Series Modems – Model 3830
S
S-Registers
changing, 4-11
displaying, 4-11
list of, 4-28
S0 (Auto-Answer Ring Number), 4-29
S2 (Escape Character), 4-29
S3 (Carriage Return Character), 4-29
S4 (Line Feed Character), 4-29
S5 (Backspace Character), 4-30
S6 (Blind Dial Pause), 4-30
S7 (No Answer Timeout), 4-30
S8 (“,” Pause Time), 4-30
S10 (No Carrier Disconnect), 4-30
S12 (Escape Guard Time), 4-2, 4-31
S18 (Test Timeout), 4-31
S26 (RTS-to-CTS Delay), 4-31
S36 (Rate Auto Originate), 4-32
S37 (Auto Redial), 4-32
S39 (Receive Buffer Disconnect Delay), 4-33
S41 (Dial Line Rate), 4-33
S43 (V32 bis Train), 4-34
S44 (Leased Line Rate), 4-34
S45 (Leased Line Transmit Level), 4-34
S48 (Leased Line Carrier On Level), 4-35
S49 (Transmit Buffer Disconnect Delay), 4-35
S51 (DTE Remote Loopback), 4-35
S52 (DTE Local Loopback), 4-36
S55 (Access from Remote), 4-36
S61 (CT111 Rate Control), 4-36
S62 (V.25 bis Coding), 4-37
S63 (V.25 bis Idle Character), 4-37
S64 (V.25 bis New Line Character), 4-37
S65 (Line Current Disconnect), 4-38
S67 (Directory Location 1 Callback), 4-38
S69 (Make Busy Via DTR), 4-38
S76 (V.32 bis Autorate – Dial Line), 4-39
S77 (DTR Alarm Reporting), 4-39
S78 (V.32 bis Automode), 4-40
S80 (No Data Disconnect Trigger Signal), 4-40
S82 (V.32 bis Autorate – Leased Line), 4-41
S83 (MI/MIC Dialing), 4-41
S84 (AT Command Mode), 4-41
Index-8
June 1994
3830-A2-GB91-10
Index
S85 (Fast Disconnect), 4-42
S88 (Straps When Disconnected), 4-42
S89 (V.42 ARQ Window Size Increase), 4-42
S90 (DTE Rate = VF Rate), 4-43
S91 (Cellular Enhancements), 4-43
S93 (RJ11 Cellular Adapt), 4-43
self-test
AT&T9, 4-21
failure, A-2
power-up, 2-6
Send Break Control (AT\K), 4-25
serial number, 4-10
speaker on/off, 4-10
speaker volume, 4-10
status indicators, 1-3
stop test (AT&T0), 4-21
Straps When Disconnected (S88), 4-42
synchronous leased-line applications, 2-11
T
T (Tone dial), 4-8
technical specifications, B-1
technical support, A-1
telephone connection, 2-5
telephone directory (AT&Z), 4-23
Test Timeout (S18), 4-31
tests (AT&T), 4-21
timeout for no answer (S7), 4-30
transmit level (AT&I), 4-17
transmit type (AT&J), 4-17
troubleshooting, A-1
220–240V power transformer, 2-2, 2-5
U
UNIX, factory default for, 4-15
3830-A2-GB91-10
June 1994
Index-9
COMSPHERE 3800 Series Modems – Model 3830
V
V.25 bis applications, 2-11
V.25 bis Coding (S62), 4-37
V.25 bis dialing, 4-18
V.25 bis dialing commands, D-1
V.25 bis Idle Character (S63), 4-37
V.25 bis New Line Character, 4-37
V.29 Train On Data (S92), 4-43
V.32 bis Automode (S78), 4-40
V.32 bis Autorate (Dial Line), 4-39
V.32 bis Autorate (Leased Line), 4-41
V.32 bis Train (S43), 4-34
V.32terbo, 1-1
V.42 ARQ Window Size (S89), 4-42
V.42 bis Compression (AT“H), 4-28
VF connector pin assignments, C-3
VF Rate, 4-33, 4-34
W
W (Wait for dial tone), 4-8
X
XON/XOFF, 4-26
XON/XOFF Passthrough (AT\X), 4-27
Index-10
June 1994
3830-A2-GB91-10
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