TABLE OF CONTENTS
CHAPTER 1 - INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 1
1.1 FUNCTIONAL DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 1
CHAPTER 2 - BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.1 FRONT PANEL INDICATORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.2 REAR PANEL CONNECTORS AND FUSES . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.3 CLOCKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.4 ELECTRICAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.5 INDICATE (I) FOLLOWS CONTROL (C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
2.5.1 CONTROL (C) DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
CHAPTER 3 - INSTALLATION Page 3
3.1 VOLTAGE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 3
3.2 VOLTAGE SELECTION FUSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 3
3.3 POWER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 3
3.4 DEFAULT CONFIGURATION SWITCH SETTINGS. . . . . . . . . . . . . . . . . . . .
Page 4
3.5 TERMINAL (DTE) CONNECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 4
3.6 INTERNAL SWITCH SETTINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 4
3.6.1 DIP SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 4
3.6.2 SWITCH FUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 4
4.0 - APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 7
4.1 X.21 INTERFACE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 7
OPERATIONS MANUAL
X.21 SYNCHRONOUS MODEM ELIMINATOR
SME-X21
02 January, 1998
FOR TECHNICAL SUPPORT CALL:
East Coast Datacom, Inc.
TEL: (800) 240-7948 or (321) 637-9922
FAX: (321) 637-9980
Email: [email protected]
Web Site: www.ecdata.com
Manufactured By
:
PT # 719009-A
East Coast Datacom, Inc.
SAFETY WARNING
Always observe standard safety precautions during installation, operation and maintenance of this product. To avoid the possibility of electrical shock, be sure to disconnect the power cord from the power source before you remove the IEC power fuses or perform any repairs.
PROPRIETARY NOTICE
The information contained herein is proprietary to East Coast Datacom, Inc. Any reproduction or redistribution of this publication, in whole or in part, is expressly prohibited unless written authorization is provided by East Coast Datacom, Inc.
WARRANTY NOTICE
WARRANTIES: East Coast Datacom, Inc. (hereafter referred to as E.C.D.) warrants that its equipment is free from any defects in materials and workmanship. The warranty period shall be three (3) years from the date of shipment. E.C.D.'s sole obligation under its warranty is limited to the repair or replacement of defective equipment, provided it is returned to E.C.D., transportation prepaid, within a reasonable period. This warranty will not extend to equipment subjected to accident, misuse, alterations or repair not made by
E.C.D. or authorized by E.C.D. in writing.
PUBLICATION NOTICE
This manual has been compiled and checked for accuracy. The information in this manual does not constitute a warranty of performance. E.C.D. reserves the right to revise this publication and make changes from time to time in the content thereof. E.C.D. assumes no liability for losses incurred as a result of out-of-date or incorrect information contained in this manual.
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
CHAPTER 1 - INTRODUCTION
1.1 FUNCTIONAL DESCRIPTION
The SME-X21 allows two X.21 DTE devices to communicate within proximity of each other. The SME-X21 transmits data bi-directionally at data rates up to 2.048Mbps between
DTE devices. All clocking and signal crossover are provided within the SME-X21. The unit is equiped with two female DB-15-P connectors.
The SME-X21 is an excellent choice for interconnecting your LAN or mainframe equipment. Substantial cost savings are derived by eliminating the need for 56/64Kbps
CSU's and T1 CSU's.
Installation is fast and simple by setting the internal switches for Clocking and Control(C) to
Indicate(I) delay. The SME-X21 has status LED's for each attached DTE device which allows the user to visually confirm the presence of control signals.
The SME-X21 utilizes state of the art digital CMOS technology to provide a feature filled product at a very affordable price. Our Field Programmable Gate Array (FPGA) design has allowed us to offer this product with a wide selection of user Baud Rates. This design approach has also reduced the amount of clock jitter for high speed 2.048Mbps
transmissions.
The SME-X21 is housed in a sturdy metal enclosure and operates on 110/220VAC.
Typical MTBF figures are in excess of 100,000 hours of operation.
TYPICAL APPLICATION
Figure 1.1
Page 1
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
CHAPTER 2 - BASIC OPERATION
2.1 FRONT PANEL INDICATORS
A Green LED marked PWR illuminates when AC Power has been applied. Two adjacent sets of Green LEDs illuminate in union with individual DTE port control signal activity.
2.2 REAR PANEL CONNECTORS AND FUSES
Located on the back or rear of the product you will find an IEC Power receptacle. The supplied power cord plugs into this receptacle. This receptacle also contains a fuse drawer. Two (2) fuses are located in this compartment. For 110 VAC +/- 10% operation the unit is equipped with slow blow 160ma Fuses, Part # 714000. For 220 VAC +/- 10% operation the unit is equipped with slow blow 80ma Fuses, Part # 714001. Additionally,
DB-15 female connectors, marked PORT A and PORT B.
2.3 CLOCKING
The SME-X21 provides an internal baud rate generator with user defined clock rates from
19.2Kbps up to 2.048Mbps.
2.4 ELECTRICAL INTERFACE
The SME-X21 is V.11 compliant utilizing the international ITU V.11 specification. The unit is equiped with female DB-15-P connectors. Refer to the interface chart in the Appendix for detailed interface information.
2.5 INDICATE(I) FOLLOWS CONTROL(C)
The SME-X21 has individual settings for each user port so that Indicate(I) follows
Control(C).
2.5.1 CONTROL(C) DELAY
The SME-X21 has individual user port settings for Control(C) delay. Options of no delay,
6ms, 12ms and 24ms are provided.
Page 2
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
CHAPTER 3 - INSTALLATION
CAUTION: Disconnect Power Before Servicing
ATTENTION: Couper Le Courant Avant l' Entretien
VORSICHT: Befor Deckung Abnehmen Mach Strom Zu
3.1 VOLTAGE SELECTION
It is very important to check that the unit is set to the correct voltage setting for your application before applying AC power. Located on the rear of the unit you will find a rotary
110/220 VAC switch. Using a coin or small screwdriver, gently turn the switch to the appropriate power position as required for your installation (110 or 220 VAC).
3.2 VOLTAGE SELECTION FUSES
Located on the back or rear of the product you will find an IEC Power receptacle. This receptacle contains a fuse drawer. Two (2) fuses are located in this compartment. For
110 VAC +/- 10% operation the unit is equipped with slow blow 5 x 20mm 160ma Fuses,
E.C.D. Part # 714000. For 220 VAC +/- 10% operation the unit is equipped with slow blow 5 x 20mm 80ma Fuses, E.C.D. Part # 714001. Spare fuses may be purchased by calling East Coast Datacom or by calling the fuse manufacturer: Little Fuse at (312)
824-3024 or Shurter, Inc. at (707) 778-6311
Little Fuse Part #'s are: 160ma = 218.160 and 80ma = 218.080
Shurter, Inc. Part #'s are: 160ma = 034.3109 and 80ma = 034.3106
3.3 POWER CONNECTION
Before connecting the SME-X21 to an AC power source the top cover should be installed with the supplied #4-40 screws. AC power is supplied to the unit through a 2.3m (6.6 ft) cord terminated by a grounded 3-prong plug. Select an appropriate location accessible to and within four to five feet of an AC outlet. The AC Power source MUST be grounded or the units Warranty will be void.
Power Connection
Figure 3-1
Page 3
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
3.4 DEFAULT CONFIGURATION SWITCH SETTINGS
The SME-X21 is configured prior to shipping with the Dip Switches set as follows:
1) Clock Rate - 19.2Kbps
2) Port A / Port B Indicate(I) - Follows Control(C)
3) Port A / Port B Control(C) delay - No Delay
4) Chassis to Signal GND - Not Connected
If your system application requires one or more of the default setting to be changed, it will be necessary to remove the top cover. Disconnect the AC Power source before servicing the unit. Removal of the top cover is accomplished by using a small Philips screwdriver and removing the four outside screws. After setting the switches, replace the top cover before applying AC power.
3.5 TERMINAL (DTE) CONNECTION
Before applying AC Power to the unit, the DCE and DTE cabling should be connected.
Straight through Male to Male DB-15 shielded cables, no longer than 2000 feet in any direction should be used. If your cables are not shielded or over 2000 feet long, transmission errors may occur.
3.6 INTERNAL SWITCH SETTINGS
3.6.1 DIP SWITCHES
The SME-X21 has two Dip Switch's that are accessible by removing the Top Cover.
Located safely inside the unit, you will find a 4 position Dip Switch marked S1 and a 10 position Dip Switch marked S2. To change the settings, you may use your finger tip or a small nonconductive instrument. It is recommended NOT to use metal objects to push on the Dip Switches, as you may slip and damage a component trace.
3.6.2 SWITCH FUNCTIONS
The following two pages provide a chart for the SME-X21 switches and the function of each switch. Please refer to this chart for all settings.
Page 4
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
SME-X21 STRAPPING CHART
Switch
S1
S4
Internal
Baud Rate
Generator
S3 S2 S1 on on on on on off off off on on on
|
V off off off off off off on on on on on on on off off off
|
V off off off off on on off off on on off on on off off on
|
V off off on on off
|
V off on
- Clock = 19.2 KHz
- Clock = 28.8 KHz off - Clock = 38.4 KHz on - Clock = 48 KHz off - Clock = 56 KHz on - Clock = 57.6 KHz off - Clock = 64 KHz on - Clock = 72 KHz off - Clock = 128 KHz on - Clock = 192 KHz off - Clock = 256 KHz on - Clock = 384 KHz off - Clock = 512 KHz on - Clock = 1.536 MHz off - Clock = 1.544 MHz on - Clock = 2.048 MHz
Page 5
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
Switch S10
S2 Not
S9
Port B
S8 used CTS
Delay
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
S7
Port B
CTS
|
|
|
|
|
|
|
|
|
S6
Not
Used
|
|
|
|
|
|
V off on
V off off on on
V off - no delay from
CONTROL on - 6 mS delay from
CONTROL off - 12 mS delay from
CONTROL on - 24 mS delay from
CONTROL
- INDICATE follows
CONTROL according to S9, S8
- INDICATE is forced on
S5
Not
S4
Port A
S3
Used CTS
Delay
|
|
|
|
|
|
S2
Port A
CTS
|
V off
S1
Not
Used
| | on
V off off on on
V off - no delay from
CONTROL on - 6 mS delay from
CONTROL off - 12 mS delay from
CONTROL on - 24 mS delay from
CONTROL
- INDICATE follows
CONTROL according to
S4, S3
- INDICATE is forced on
Page 6
XFMR
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
DB-15 CONNECTOR
PORT A
J2
DB-15 CONNECTOR
PORT B
S2
S1
PORT "A" INDICATORS PORT "B" INDICATORS
Page 7
East Coast Datacom, Inc. SME-X21 OPERATIONS MANUAL
4.0 - APPENDIX
4.1 X.21 INTERFACE CHART
ITU X.21 INTERFACE CHART
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PIN NAME
SHIELD
TRANSMIT(A+)
CONTROL (A+)
RECEIVE (A+)
INDICATE (A+)
SIGNAL TIMING (A+)
BYTE TIMING (A+)
GROUND
TRANSMIT (B-)
CONTROL (B-)
RECEIVE (B-)
INDICATE (B-)
SIGNAL TIMING (B-)
BYTE TIMING (B-)
NOT USED
FROM DCE
-
FROM DTE
-
X
X
X
X
X
X
-
X
X
X
X
X
X
Page 8
5.0 - TECHNICAL SPECIFICATIONS
Application
Interconnection of two X.21 DTE (Terminal) devices located within proximity of each other
Weight
2 pounds (0.914Kg)
Capacity
Two (2) X.21 DTE's
Warranty
Three Years, Return To Factory
Interface
X.21 using V.11 electrical specification
Data Rates
Up to 2.048Mbps
Option for T2 (6.312Mbit)
ORDERING INFORMATION
Model: SME-X21
Description: Synchronous X.21 Modem
Eliminator
Channel Interface
Two Female DB-15 Connectors
INCLUDED WITH EACH UNIT:
1) Operations Manual
2) U.S.A. Grounded Power Cord, Part # 713015
3) Optional Power Cords
A) United Kingdom, Part # 713016
B) Continental Europe, Part # 713017
C) Other: Specify Country on Purchase Order
Surge Protection
Main power supply
OPTIONAL ACCESSORIES
1) Spare Data Center Fuses
A) 160ma Fuse, Qty (2) Part # 714000
B) 80ma Fuse, Qty (2) Part # 714001
Power Source
100-120 to 200-220VAC @10%, 50/60Hz,
0.16/0.08A, external 110/220 volt select switch,
IEC Power Inlet, (2) 5mm Fuses
For further detailed technical information on this product, contact East Coast Datacom Technical
Assistance toll free at (800) 240-7948
OTHER EAST COAST DATACOM PRODUCTS
Environmental
Operating Temperature ....
32º to 122º F (0º to 50º C)
Relative Humidity .............
5 to 95%
Non-Condensing
Altitude ............................
0 to 10,000 feet
MODEM AND PORT SHARING DEVICES
INTERFACE CONVERTERS
SIGNAL REGENERATORS
LINE DRIVERS
Dimensions
Height .......
1.75 inches (4.44 cm)
Width ........
7.90 inches (20.07 cm)
Length .......
9.00 inches (22.86 cm)
Page 9
