PSTN Socket Modem Modules XM3000S Series

PSTN Socket Modem Modules XM3000S Series
XM3000S Series Designers Guide
PSTN Socket Modem Modules
XM3000S Series
Designer’s Guide
Version 101
Released 24. November 2011
XM3000S-E00-101
xmodus swiss GmbH
1 / 43
XM3000S Series Designer’s Guide
Information provided by xmodus swiss GmbH is believed to be accurate and reliable.
However, no responsibility is assumed by xmodus swiss for its use, nor any
infringement of patents or other rights of third parties which may result from its use.
No license is granted by implication or otherwise under any patent rights of xmodus
other than for circuitry embodied in xmodus products. Xmodus swiss reserves the
right to change circuitry at any time without notice. This document is subject to
change without notice.
Product names or services listed in this publication are for identification purposes
only, and may be trademarks or registered trademarks of their respective companies.
All other marks mentioned herein are the property of their respective owners.
© 2010 xmodus swiss GmbH
Printed in Switzerland
All Rights Reserved
XM3000S-E00-101
xmodus swiss GmbH
Seite 2 / 43
XM3000S Series Designer’s Guide
Table of Contents
1.
INTRODUCTION
6
1.1
Product Overview
6
1.2
Product Summary
6
1.3
Features
7
1.4
Applications
8
2.
2.1
TECHNICAL OVERVIEW
9
General Description
9
2.2
Operating Modes
2.2.1
Data / Fax Modes
2.2.2
V.44 Data Compression
2.2.3
Synchronous Access Mode (SAM) - Video Conferencing
2.2.4
TAM Mode
2.2.5
Speakerphone Mode (XM3192S models)
2.2.6
Worldwide Operation
9
9
10
10
10
10
11
2.3
AT Commands
13
2.4
Supported Interfaces
13
Technical Spezifications
14
3.
3.1
Serial DTE Interface Operation
3.1.1
Automatic Speed/Format Sensing
14
14
3.2
Establishing Data Modem Connections
3.2.1
Dialing
3.2.2
Modem Handshaking Protocol
3.2.3
Call Progress Tone Detection
3.2.4
Answer Tone Detection
3.2.5
Ring Detection
3.2.6
Billing Protection
3.2.7
Connection Speeds
3.2.7
Automode
15
15
15
15
15
15
15
16
16
3.3
Data Mode
3.3.1
Speed Buffering (Normal Mode)
3.3.2
Flow Control
3.3.3
Escape Sequence Detection
3.3.4
Break Detection
3.3.5
Telephone Line Monitoring
3.3.6
Fall Forward / Fallback
3.3.7
Retrain
3.3.8
Programmable Inactivity Timer
3.3.9
DTE Signal Monitoring
3.3.10 Call Progress Speaker Interface
3.3.11 Serial EEPROM
16
16
17
17
17
17
17
17
17
18
18
18
3.4
V.92 Features
3.4.1
Modem-on-Hold
3.4.2
Quick Connect
3.4.3
PCM Upstream
18
18
19
19
3.5
Error Correction and Data Compression
3.5.1
V.42 Error Correction
3.5.2
MNP 2-4 Error Correction
3.5.3
V.44 Data Compression
19
19
19
19
XM3000S-E00-101
xmodus swiss GmbH
Seite 3 / 43
XM3000S Series Designer’s Guide
3.5.4
3.5.5
V.42bis Data Compression
MNP 5 Data Compression
19
20
3.6
Voice/Audio Mode
3.6.1
Online Voice Command Mode
3.6.2
Voice Receive Mode
3.6.3
Voice Transmit Mode
3.6.4
Full-Duplex Receive and Transmit Mode
3.6.5
Tone Detectors
3.6.6
Speakerphone Mode (XM3192S models)
20
20
20
20
20
21
21
3.7
Synchronous Access Mode (SAM)
21
3.8
Full-Duplex Speakerphone (FDSP) Mode (XM3102S models)
21
3.9
Telephony Extensions
3.9.1
Line-in-Use Detection
3.9.2
Extension Pick-up Detection
3.9.3
Remote Hang-up Detection
21
22
22
22
3.10
Point-of-Sales Support
22
3.11
Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation
22
3.12
Tone Detectors
23
3.13
Call Waiting Tone Detection
23
3.14
Caller ID
23
3.15
Worldwide Country Support
23
3.16
Diagnostics
24
3.17 Low Power Modes
3.17.1 Idle Mode
3.17.2 Sleep Mode
3.17.3 Deep Sleep Mode
3.17.4 Stop Mode
4.
24
24
24
25
25
MODEM HARDWARE
26
4.1
Modem Hardware Interface Signals
4.1.1
Phone Interface
4.1.2
Call Progress Speaker Interface
4.1.3
Serial DTE Interface
4.1.4
Modem Hardware Block Diagram
4.1.5
Signal Description
4.1.6
Digital Electrical Characteristics
4.1.7
Analog Electrical Characteristics
4.1.8
Operating Conditions
4.1.9
Absolute Maximum Ratings
26
26
26
26
26
28
30
30
31
31
4.2
32
DAA Interface
4.3
Audio / Speaker Interface
4.3.1
Audio Interface for XM3192S Models.
33
34
4.4
Reset Interface
4.4.1
Recommended Reset Circuit
35
35
5.
DESIGN CONSIDERATIONS
36
5.1
PC Board Layout Guidelines
5.1.1
General
5.1.2
Electromagnetic Interference (EMI) Considerations
36
36
37
5.2
Other Considerations
38
5.3
Manufacturing Considerations
38
XM3000S-E00-101
xmodus swiss GmbH
Seite 4 / 43
XM3000S Series Designer’s Guide
6.
PACKAGE DIMENSIONS
39
7.
SOCKET MODEM APPROVALS
40
7.1
Considerations for Telecom Approvals
7.1.1
Electromagnetic Interference (EMI) Considerations
40
40
7.2
Considerations for Electrical Safety
7.2.1
Conditions for Maintaining Safety Compliance (European Countries)
7.2.2
Power Supply [EN60950-1:2001, 1.6]
7.2.3
Clearances and Creepage Distances (EN60950-1:2001)
41
41
41
41
7.3
Considerations for EMC
7.3.1
EMC Compliance (European Countries)
7.3.2
Installation in Host Systems (European Countries)
43
43
43
List of Figures
FIGURE 4-1. MODULE PINOUT .................................................................................................................. 27
FIGURE 4-4. RECOMMENDED TELEPHONE LINE INTERFACE FOR U.S. AND WORLD CLASS MODEM. ............. 32
FIGURE 4-5. SOUNDUCER DRIVER CIRCUIT .............................................................................................. 33
FIGURE 4-6. SPEAKER DRIVER CIRCUIT .................................................................................................... 34
FIGURE 4-7. AUDIO INTERFACE CIRCUIT. .................................................................................................. 34
FIGURE 6-1. XM3000S SOCKET MODEM PHYSICAL DIMENSIONS ............................................................... 39
List of Tables
TABLE 4-1. SIGNAL NAMES....................................................................................................................... 27
TABLE 4.2. SIGNAL DESCRIPTIONS ........................................................................................................... 28
TABLE 4-3. SIGNAL DESCRIPTIONS (CONT'D) ............................................................................................ 29
XM3000S-E00-101
xmodus swiss GmbH
Seite 5 / 43
XM3000S Series Designer’s Guide
1.
INTRODUCTION
1.1
Product Overview
This Designer’s Guide describes the XM3000S series PSTN socket modem modules of
xmodus swiss GmbH. The description applies to all these modems with any differences
between products noted. Refer to Modem Firmware Release notes for commands applicable
to modem firmware. AT commands and S registers are defined in the AT Command
Reference Manual.
Part No.
Supported Functions
Module
Order No.
V.92
V.34
V.32bis
Fax Class
1&2
XM3092S
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
XM3034S
XM3032S
XM3192S
1.2
Y
Y
TAM
Speakerphone
Y
Product Summary
The Xmodus XM3000S Socket Modem Family provides the user with a complete V.92, V.34
and V.32bis data/fax/voice modem in a compact socket mountable module. The compact size
and high level of integration of the Socket Modem minimizes real estate and cost for
motherboard and box modem applications. Its low power consumption makes it ideal for a
wide variety of embedded control applications. The pin compatibility between the full range of
the PSTN, ISDN, Ethernet, PLC and GSM Socket Modems allows upgrading and production
configurability without hardware changes.
As a data modem, the XM3092S and XM3192S Modems can receive data at speeds up to
56kbps and can send data at speeds up to 33.6 kbps. Error correction (V.42 / MNP 2-4) and
data compression (V.44, V.42bis, and MNP 5) maximize data transfer integrity and boost
average throughput up to 115.2 kbps. Non-error-correcting mode is also supported.
As a fax modem, all the XM3000S modules are supporting Group 3 send and receive rates up
to 14.4 kbps and are supporting Class 1 and Class 2 T.30 protocols.
The XM3192S modem supports position independent, full-duplex speakerphone (FDSP)
operation using microphone and speaker, as well as other voice/TAM applications using
handset or headset.
XM3000S-E00-101
xmodus swiss GmbH
Seite 6 / 43
XM3000S Series Designer’s Guide
In TAM mode, enhanced 2-bit or 4-bit per sample coding schemes at 8 kHz sample rate
provide flexible format compatibility and allows efficient digital storage of voice/audio. Also
supported are 8-bit A-law, μ-law, and linear coding and IMA 4-bit ADPCM coding. This mode
supports applications such as digital telephone answering machine, voice annotation, and
recording from and playback to the telephone line.
In V.22 bis fast connect mode, the modem can connect at 2400 bps with a very short training
time, which is very efficient for small data transfers.
1.3
Features
 ITU-T V.92 (V.92 model)
o
Modem-on-Hold (MOH)
o
Quick connect (QC)
o
PCM upstream
 V.90 (V.92 model)
 V.34 (V.92 and V.34 models)
 V.32bis, V.32, V.22bis, V.22, V.23, V.21
 V.23 reverse, V.23 half-duplex
 Bell 212A/Bell 103
 V.29 FastPOS
 V.22bis fast connect
 V.80 Synchronous Access Mode
 Data compression and error correction
 V.44 data compression
 V.42bis and MNP 5 data compression
 V.42 LAPM and MNP 2-4 error correction
 Fax modem send and receive rates up to 14.4 kbps
 V.17, V.29, V.27 ter, and V.21 channel 2
 EIA/TIA 578 Class 1, T.31 Class 1.0, and Class 2
 Call Waiting (CW) detection and Type II Caller ID decoding during data mode
 Type I Caller ID (CID) decoding
 Telephony/TAM
 V.253 commands
 2-bit and 4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit linear PCM, and
 8-bit μ-law and A-law PCM coding
 8 kHz sample rate
XM3000S-E00-101
xmodus swiss GmbH
Seite 7 / 43
XM3000S Series Designer’s Guide
 Concurrent DTMF, ring, and Caller ID detection
 DTE/host interface
 Serial DTE interface
 Direct Mode
 Asynchronous Mode
 Sixty-three embedded and upgradeable country profiles
 Serial NVRAM interface for optional permanent country profile storage
 Embedded AT commands
 Full-duplex speakerphone (FDSP) mode using CX20452 Codec (XM3192S)
 Microphone and speaker interface (XM3192S)
 Acoustic and line echo cancellation
 Microphone gain and muting
 Speaker volume control and muting
 SmartDAA
 Extension pick-up detection
 Digital line protection
 Line reversal detection
 Line-in-use detection
 Remote hang-up detection
 Worldwide compliance
 Low power and voltage
 Single +5V or 3.3V supply
 Low power consumption mode
 Compact, robust board design
 Small, low-profile modem package
 SmartDAA and DIB technologies
 Design supports 3750V isolation
1.4
Applications
 Internet appliances
 Embedded remote control consoles
 Smart Metering devices
 Retail modems
 Alarm systems
 Vending machines
 POS terminals
XM3000S-E00-101
xmodus swiss GmbH
Seite 8 / 43
XM3000S Series Designer’s Guide
2.
TECHNICAL OVERVIEW
2.1
General Description
Modem operation, including dialing, call progress, telephone line interface, telephone handset
interface, voice / speakerphone interface and host interface functions are supported and
controlled through the V.250, V.251, and V.253-compatible command set.
2.2
Operating Modes
2.2.1 Data / Fax Modes
Data modem modes perform complete handshake and data rate negotiations. Using modem
modulations to optimize modem configuration for line conditions, the modem can connect at
the highest data rate that the channel can support from 56 kbps down to 2400 bps with
automatic fallback.
In V.92 data modem mode, the modem can receive data from a digital source using a V.92compatible central site modem at line speeds up to 56 kbps. With PCM upstream enabled,
data transmission supports sending data at line speeds up to 48 kbps. When PCM upstream is
disabled, data transmission supports sending data at line speeds up to V.34 rates. This mode
can fallback to V.34 mode and to lower rates as dictated by line conditions.
The following modes in V.92 models are also supported when connected to a V.92compatible server supporting the feature listed.

Quick connect, which allows quicker subsequent connection to a server using stored
line parameters obtained during the initial connection. The server must support quick
connect profiles.

Modem-on-Hold, which allows detection and reporting of incoming phone calls on the
PSTN with enabled Call Waiting. If the incoming call is accepted by the user, the user
has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination. The
server must support Modem-on-Hold functionality.

PCM upstream, which boosts the upstream data rates between the user and V.92
server. A maximum of 48 kbps upstream rate is supported when connected to a V.92
server that supports PCM upstream.
In V.34 data modem mode, the modem can operate in 2-wire, full-duplex, asynchronous
modes at line rates up to 33.6 kbps. Data modem modes perform complete handshake and
data rate negotiations. Using V.34 modulation to optimize modem configuration for line
conditions, the modem can connect at the highest data rate that the channel can support from
33600 bps down to 2400 bps with automatic fallback. Automode operation in V.34 is provided
in accordance with PN3320 and in V.32bis in accordance with PN2330. All tone and pattern
detection functions required by the applicable ITU or Bell standards are supported.
XM3000S-E00-101
xmodus swiss GmbH
Seite 9 / 43
XM3000S Series Designer’s Guide
In V.32bis data modem mode, the modem can operate at line speeds up to 14.4 kbps. In fax
modem mode, the modem can operate in 2-wire, half-duplex, synchronous modes and can
support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200, 4800, and
2400 bps. Fax data transmission and reception performed by the modem are controlled and
monitored through the EIA/TIA-578 Fax Class 1, T.31 Fax Class 1.0, or Fax Class 2 command
interface. Full HDLC formatting, zero insertion/deletion, and CRC generation/checking are
provided.
2.2.2
V.44 Data Compression
V.44 provides more efficient data compression than V.42bis that significantly decreases the
download time for the types of files associated with Internet use. This significant improvement
is most noticeable when browsing and searching the web since HTML text files are highly
compressible. (The improved performance amount varies both with the actual format and with
the content of individual pages and files.)
2.2.3
Synchronous Access Mode (SAM) - Video Conferencing
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for hostcontrolled communication protocols, e.g., H.324 video conferencing applications.
2.2.4
TAM Mode
TAM Mode features include 2-bit/4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit linear PCM,
and 8-bit μ-law and A-law PCM coding at 8 kHz sample rate. Tone detection/ generation, call
discrimination, and concurrent DTMF detection are also supported.
TAM Mode is supported by four submodes:

Online Voice Command Mode supports connection to the telephone line.

Voice Receive Mode supports recording voice or audio data input from the Telephone
line.
2.2.5

Voice Transmit Mode supports playback of voice or audio data to the telephone line.

Full-duplex Receive and Transmit Mode.
Speakerphone Mode (XM3192S models)
When using the optional CX20452 Codec, the modem includes additional Telephone handset,
external microphone, and external speaker interfaces which support voice and full-duplex
speakerphone (FDSP) operation. Hands-free full-duplex telephone operation is supported in
Speakerphone Mode under host control. Speakerphone Mode features an advanced
proprietary speakerphone algorithm which supports full-duplex voice conversation with
acoustic, line, and handset echo cancellation. Parameters are constantly adjusted to maintain
XM3000S-E00-101
xmodus swiss GmbH
Seite 10 / 43
XM3000S Series Designer’s Guide
stability with automatic fallback from full-duplex to pseudo-duplex operation. The
speakerphone algorithm allows position independent placement of microphone and speaker.
The host can separately control volume, muting, and AGC in microphone and speaker
channels.
2.2.6
Worldwide Operation
The modem operates in TBR21-compliant and other countries. Country-dependent modem
parameters for functions such as dialing, carrier transmit level, calling tone, call progress tone
detection, answer tone detection, blacklisting, caller ID, and relay control are programmable.
SmartDAA technology allows a single PCB design and single BOM to be homologated
worldwide. Advanced features such as extension pick-up detection, remote hang-up detection,
line-in-use detection, and digital PBX line protection are supported. Country code IDs are
defined by ITU-T T.35. Internal ROM includes default profiles for 63 countries including
TBR21-compliant profiles. An additional or modified country profile can be loaded into internal
SRAM. A duplicate country profile stored in internal SRAM will override the profile in internal
ROM firmware. Additional country profiles can be loaded into external NVRAM for permanent
storage. The default countries supported are listed in Table 1-2. Request additional country
profiles from an Xmodus Sales Office.
Table 1-2:
Country
Argentina
Australia
Country Call Waiting Tone
Code
detection(CW)
supported
7
X
On-Hook Type 1
Caller ID (CID)
supported
Off-Hook Type 2
Caller ID (CID2)
supported
X
9
X
X
X
Austria
0A
X
X
X
Belgium
0F
X
X
Brazil
16
X
X
Bulgaria
1B
X
X
Canada
20
X
X
X
X
X
Chile
25
X
China
26
X
X
Colombia
27
X
X
Croatia
FA
X
X
Cyprus
2D
X
X
Czech Republic
2E
X
X
Denmark
31
X
X
X
Egypt
36
X
X
Estonia
F9
X
X
Finland
3C
X
X
X
France
3D
X
X
X
Germany
42
X
X
X
Greece
46
X
XM3000S-E00-101
xmodus swiss GmbH
X
Seite 11 / 43
XM3000S Series Designer’s Guide
Country
Hong Kong
Country Call Waiting Tone
Code
detection(CW)
supported
50
X
On-Hook Type 1
Caller ID (CID)
supported
Off-Hook Type 2
Caller ID (CID2)
supported
X
X
Hungary
51
X
X
Iceland
52
X
X
India
53
X
Indonesia
54
X
Ireland
57
X
Israel
58
X
X
X
X
X
X
X
Italy
59
X
X
X
Japan
00
X
X
X
Korea
61
X
X
X
Kuwait
62
X
Lebanon
64
X
Luxembourg
69
X
Malaysia
6C
X
Mexico
73
X
Morocco
77
X
Netherlands
7B
X
X
New Zealand
7E
X
X
Norway
82
X
X
Pakistan
84
X
Philippines
89
X
Poland
8A
X
Portugal
8B
X
Romania
8E
X
Russia
B8
X
Saudi Arabia
98
X
Senegal
99
X
Singapore
9C
X
Slovakia
FB
X
Slovenia
FC
X
South Africa
9F
X
Spain
A0
X
Sri Lanka
A1
X
Sweden
A5
X
Switzerland
A6
X
Taiwan
FE
X
Thailand
A9
X
Tunisia
AD
X
Turkey
AE
X
United Kingdom
B4
X
United Arab Emirates
B3
X
Uruguay
B7
X
United States
B5
X
Reserved
FD
XM3000S-E00-101
xmodus swiss GmbH
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Seite 12 / 43
XM3000S Series Designer’s Guide
2.3
AT Commands
Modem operation is controlled by AT and S register commands issued by the DTE. Refer to
the "AT Commands for the XM3000S Modems Reference Manual". See Doc. XM3000S-A00100 for a description of the commands.
The modem supports data modem, fax class 1, 1.0, or 2 modem, TAM, V.80 commands, and
S Registers in accordance with modem model options.
Data Modem Operation. Data modem functions operate in response to the AT commands
when +FCLASS=0. Default parameters support U.S./Canada operation. Fax Mode Operation.
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1, to fax
class 1.0 commands when +FCLASS=1.0, or to fax class 2 commands when +FCLASS=2.
2.4
Supported Interfaces
The major hardware signal interfaces of the XM3000S Series Socket Modem are illustrated in
Figure 2-1.
TTL
Serial
Interface
Power
Reset
5
3
2
Socket
Modem
Module
1
2
RJ11
Modular Jack
MOV and
EMI circuitry
Speaker
Driver
Circuit
FIGURE 2-1. TYPICAL SERIAL BLOCK DIAGRAM
XM3000S-E00-101
xmodus swiss GmbH
Seite 13 / 43
XM3000S Series Designer’s Guide
3.
TECHNICAL SPEZIFICATIONS
3.1
Serial DTE Interface Operation
3.1.1
Automatic Speed/Format Sensing
Command Mode and Data Mode. The modem can automatically determine the speed and
format of the data sent from the DTE. The modem can sense speeds of 300, 600, 1200, 2400,
4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 38400, 57600,
and 115200 bps and the following data formats:
Parity
Data Length
No. of Stop Bits
(no of bits)
None
Odd
Even
None
Odd
Even
7
7
7
8
8
8
Character Length
(no. of bits)
2
1
1
1
1
1
10
10
10
10
11*
11*
* 11-bit characters are sensed, but the parity bit is stripped off during data transmission in
Normal and Error Correction modes.
The modem can speed sense data with mark or space parity and configures itself as
follows:
DTE Configuration
Modem
Configuration
7 mark
7 space
8 mark
8 space
7 none
8 none
8 none
8 even
XM3000S-E00-101
xmodus swiss GmbH
Seite 14 / 43
XM3000S Series Designer’s Guide
3.2
Establishing Data Modem Connections
3.2.1
Dialing
DTMF Dialing. DTMF dialing using DTMF tone pairs is supported in accordance with ITU-T
Q.23.
Pulse Dialing. Pulse dialing is supported in accordance with EIA/TIA-496-A.
Blind Dialing. The modem can blind dial in the absence of a dial tone if enabled by the X0,
X1, or X3 command.
3.2.2
Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is dialed,
the modem aborts the call attempt.
3.2.3
Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be detected
in accordance with the applicable standard.
3.2.4
Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes and
2225 ± 40 Hz in Bell modes.
3.2.5
Ring Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave input.
3.2.6
Billing Protection
When the modem goes off-hook to answer an incoming call, both transmission and reception
of data are prevented for 2 seconds to allow transmission of the billing tone signal.
XM3000S-E00-101
xmodus swiss GmbH
Seite 15 / 43
XM3000S Series Designer’s Guide
3.2.7
Connection Speeds
The modem functions as a data modem when the +FCLASS=0 command is active. Line
connection can be selected using the +MS command. The +MS command selects modulation,
enables/disables automode, and selects minimum and maximum line speeds
Table 3-1. +MS Command Automode Connectivity
3.2.7
Modulation
<carrier>
Possible <min_rx_rate>, and <max_tx_rate>)
Rates (bps)
Bell 103
B103
300
Bell 212
B212
1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21
V21
300
V.22
V22
1200
V.22bis
V22B
2400 or 1200
V.23
V23C
1200
V.32
V32
9600 or 4800
V.32bis
V32B
14400, 12000, 9600, 7200, or 4800
V.34/V.90 upstream
V34/V90
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
V.90 downstream
V90
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 downstream
V92
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 upstream
V92
48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
Automode
Automode detection can be enabled by the +MS command to allow the modem to connect to
a remote modem in accordance with draft PN-3320 for V.34 (Table 3-1).
3.3
Data Mode
Data mode exists when a telephone line connection has been established between modems
and all handshaking has been completed.
3.3.1 Speed Buffering (Normal Mode)
Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed
different than the line speed. The modem supports speed buffering at all line speeds.
XM3000S-E00-101
xmodus swiss GmbH
Seite 16 / 43
XM3000S Series Designer’s Guide
3.3.2 Flow Control
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to modem
speed, the modem supports XOFF/XON or RTS/CTS flow control with the DTE to ensure data
integrity.
3.3.3 Escape Sequence Detection
The +++ escape sequence can be used to return control to the command mode from the data
mode. Escape sequence detection is disabled by an S2 Register value greater than 127.
3.3.4 Break Detection
The modem can detect a BREAK signal from either the DTE or the remote modem. The \Kn
command determines the modem response to a received BREAK signal.
3.3.5 Telephone Line Monitoring
GSTN Cleardown (V.92, V.90, V.34, V.32bis, V.32). Upon receiving GSTN Cleardown from
the remote modem in a non-error correcting mode, the modem cleanly terminates the call.
Loss of Carrier (V.22bis and Below). If carrier is lost for a time greater than specified by the
S10 register, the modem disconnects.
3.3.6 Fall Forward / Fallback
During initial handshake, the modem will fallback to the optimal line connection within
V.92/V.90/V.34/V.32bis/V.32 mode depending upon signal quality if automode is enabled by
the +MS or N1 command. When connected in V.92/V.90/V.34/V.32bis/V.32 mode, the modem
will fall forward or fallback to the optimal line speed within the current modulation depending
upon signal quality if fall forward/fallback is enabled by the %E2 command.
3.3.7 Retrain
The modem may lose synchronization with the received line signal under poor or changing line
conditions. If this occurs, retraining may be initiated to attempt recovery depending on the type
of connection. The modem initiates a retrain if line quality becomes unacceptable if enabled by
the %E command. The modem continues to retrain until an acceptable connection is
achieved, or until 30 seconds elapse resulting in line disconnect.
3.3.8 Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified length of
time. In normal or error-correction mode, this inactivity timer is reset when data is received
from either the DTE or from the line. This timer can be set to a value between 0 and 255
seconds by using register S30. A value of 0 disables the inactivity timer.
XM3000S-E00-101
xmodus swiss GmbH
Seite 17 / 43
XM3000S Series Designer’s Guide
3.3.9 DTE Signal Monitoring
DTR. When DTR is asserted, the modem responds in accordance with the &Dn and &Qn
commands.
RTS. RTS is used for flow control if enabled by the &K command in normal or error correction
mode.
3.3.10 Call Progress Speaker Interface
A digital speaker output (DSPKOUT) is supported. DSPKOUT is a square wave output in Data
mode used for call progress or carrier monitoring. This output can be optionally connected to a
low-cost on-board speaker, e.g., a sounducer, or to an analog speaker circuit.
3.3.11 Serial EEPROM
The module supports an optional serial EEPROM. The EEPROM can hold information such as
firmware customization, and country code parameters. Data stored in EEPROM takes
precedence over the factory default settings. A serial EEPROM is required if additional storage
is required for more country profiles or customized firmware code.
3.4
V.92 Features
Modem-on-Hold, quick connect, and PCM upstream are only available when connecting in
V.92 data mode. V.92 features are only available when the server called is a V.92 server that
supports that particular feature.
3.4.1
Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place an Internet data connection
on hold while using the same line to accept an incoming or place an outgoing voice call. This
feature is available only with a connection to a server supporting MOH. MOH can be executed
through either of two methods:

One method is to enable MOH through the +PMH command. With Call Waiting Detection
(+PCW command) enabled, an incoming call can be detected while online. Using a string
of commands, the modem negotiates with the server to place the data connection on hold
while the line is released so that it can be used to conduct a voice call. Once the voice call
is completed, the modem can quickly renegotiate with the server back to the original data
call.

An alternative method is to use communications software that makes use of the Conexant
Modem-on-Hold drivers. Using this method, the software can detect an incoming call,
place the data connection on hold, and switch back to a data connection.
XM3000S-E00-101
xmodus swiss GmbH
Seite 18 / 43
XM3000S Series Designer’s Guide
3.4.2
Quick Connect
The quick connect function enables the modem to shorten the connect time of subsequent
calls to a server supporting quick connect. The quick connect feature is supported by the
+PQC command.
3.4.3
PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce upload
times for large files and email attachments. A maximum of 48 kbps upstream rate is supported
with PCM upstream enabled, in contrast to a maximum of 32.2 kbps upstream rate with PCM
upstream not enabled. PCM upstream is supported by the +PCM command. PCM upstream is
disabled by default.
3.5
Error Correction and Data Compression
3.5.1
V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The modem
provides a detection and negotiation technique for determining and establishing the best
method of error correction between two modems.
3.5.2
MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data integrity.
Supporting stream mode, the modem sends data frames in varying lengths depending on the
amount of time between characters coming from the DTE.
3.5.3
V.44 Data Compression
V.44 data compression encodes pages and files associated with Web pages more efficiently
than V.42bis. These files include WEB pages, graphics and image files, and document files.
V.44 can provide an effective data throughput rate up to DTE rate for a 56-kbps connection.
The improved performance amount varies both with the actual format and with the content of
individual pages and files.
3.5.4
V.42bis Data Compression
V.42bis data compression mode, enabled by the %Cn command or S46 register, operates
when a LAPM connection is established. The V.42bis data compression employs a “string
learning” algorithm in which a string of characters from the DTE is encoded as a fixed length
codeword and stored in a dictionary. The dictionary is dynamically updated during normal
operation.
XM3000S-E00-101
xmodus swiss GmbH
Seite 19 / 43
XM3000S Series Designer’s Guide
3.5.5
MNP 5 Data Compression
MNP 5 data compression mode, enabled by the %Cn command, operates during an MNP
connection. In MNP 5, the modem increases its throughput by compressing data into tokens
before transmitting it to the remote modem, and by decompressing encoded received data
before sending it to the DTE.
3.6
Voice/Audio Mode
Voice and audio functions are supported by the Voice Mode. Voice Mode includes four
submodes: Online Voice Command Mode, Voice Receive Mode, Voice Transmit Mode and
Full-Duplex Receive and Transmit Mode.
3.6.1
Online Voice Command Mode
This mode results from the connection to the telephone line or a voice/audio I/O device (e.g.,
microphone, speaker, or handset) through the use of the +FCLASS=8 and +VLS commands.
After mode entry, AT commands can be entered without aborting the connection.
3.6.2
Voice Receive Mode
This mode is entered when the +VRX command is active in order to record voice or audio data
input at the RIN pin, typically from a microphone/handset or the Telephone line. Received
analog voice samples are converted to digital form and compressed for reading by the host.
AT commands control the codec bits-per-sample rate. Received analog mono audio samples
are converted to digital form and formatted into 8-bit unsigned linear PCM format for reading
by the host. AT commands control the bit length and sampling rate. Concurrent DTMF/tone
detection is available at the 8 kHz sample rate.
3.6.3
Voice Transmit Mode
This mode is entered when the +VTX command is active in order to playback voice or audio
data to the TXA output, typically to a speaker/handset or to the telephone line. Digitized voice
data is decompressed and converted to analog form at the original compression quantization
sample-per-bits rate then output to the TXA output. Digitized audio data is converted to analog
form then output to the TXA output.
3.6.4
Full-Duplex Receive and Transmit Mode
This mode is entered when the +VTR command is active in order to concurrently receive and
transmit voice.
XM3000S-E00-101
xmodus swiss GmbH
Seite 20 / 43
XM3000S Series Designer’s Guide
3.6.5
Tone Detectors
The tone detector signal path is separate from the main received signal path thus enabling
tone detection to be independent of the configuration status. In Tone Mode, all three tone
detectors are operational.
3.6.6
Speakerphone Mode (XM3192S models)
Speakerphone mode is controlled in voice mode with the following commands:
Use Speakerphone After Dialing or Answering (+VSP=1). +VSP=1 selects speakerphone
mode while in +FCLASS=8 mode. Speakerphone operation is entered during Voice Online
Command mode after completing dialing or answering.
Speakerphone Settings. The +VGM and +VGS commands can be used to control the
microphone gain and speaker volume, respectively. VGM and +VGS commands are valid only
after the modem has entered the Voice Online mode while in the +VSP=1 setting.
3.7
Synchronous Access Mode (SAM)
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for hostcontrolled communication protocols, e.g., H.324 video conferencing applications. Voice-callfirst (VCF) before switching to a videophone call is also supported.
3.8
Full-Duplex Speakerphone (FDSP) Mode (XM3102S models)
The modem operates in FDSP mode when +FCLASS=8 and +VSP=1 (Section 2.6.6). In
FDSP Mode, speech from a microphone or handset is converted to digital form, shaped, and
output to the telephone line through the line interface circuit. Speech received from the
telephone line is shaped, converted to analog form, and output to the speaker or handset.
Shaping includes both acoustic and line echo cancellation.
3.9
Telephony Extensions
The following telephony extension features are supported and are typically implemented in
designs for set-top box applications to enhance end-user experience:

Line-in-use detection

Extension pick-up detection

Remote hang-up detection
The telephony extension features are enabled through the -STE command. The –TTE
command can be used to adjust the voltage thresholds for the telephony extension features.
XM3000S-E00-101
xmodus swiss GmbH
Seite 21 / 43
XM3000S Series Designer’s Guide
3.9.1
Line-in-Use Detection
The line-in-use detection feature can stop the modem from disturbing the phone line when the
line is already being used. When an attempt is made to dial using ATDT and the phone line is
in use, the modem will not go off hook and will respond with the message “LINE IN USE”.
3.9.2
Extension Pick-up Detection
The extension pick-up detection feature (also commonly referred as PPD or Parallel phone
detection) allows the modem to detect when another telephony device (i.e., fax machine,
phone, and satellite/cable box) is attempting to use the phone line. When an extension pick-up
has been detected, the modem will go on-hook and respond with the message “OFF-HOOK
INTRUSION”. This feature can be used to quickly drop a modem connection in the event when
a user picks up an extension phone line. For example, this feature allows any terminal with an
integrated XM3000S module to give normal voice users the highest priority over the telephone
line.
3.9.3
Remote Hang-up Detection
The remote hang-up detection feature will cause the modem to go back on-hook and respond
with the message “LINE REVERSAL DETECTED” during a data connection when the remote
modem is disconnected for abnormal termination reasons (remote phone line unplugged,
remote server/modem shutdown).
3.10 Point-of-Sales Support
Point-of-Sales (POS) terminals usually need to exchange a small amount of data in the
shortest amount of time. Low speed modulations such as Bell212A or V.22 are still mainly
used in POS applications. Additionally, new non-standard sequences have been developed to
better support POS applications. Industry standard and shortened answer tone B103 and V.21
are supported, as well as FastPOS (V.29) and V.22 FastConnect. POS terminal modulations
are supported by the $F command.
3.11 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1, to fax
class 1.0 commands when +FCLASS=1.0, or to fax class 2 commands when +FCLASS=2. In
the fax mode, the on-line behavior of the modem is different from the data (non-fax) mode.
After dialing, modem operation is controlled by fax commands. Some AT commands are still
valid but may operate differently than in data modem mode. Calling tone is generated in
accordance with T.30.
XM3000S-E00-101
xmodus swiss GmbH
Seite 22 / 43
XM3000S Series Designer’s Guide
3.12 Tone Detectors
The modem is equipped with three tone detectors with separate signal paths from the main
received signal path thus enabling tone detection to be independent of the configuration
status.
3.13 Call Waiting Tone Detection
Call Waiting tones can be detected when in V.92, V.90, V.34, and V.32bis data modes.
3.14 Caller ID
Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller ID) are
supported for U.S. and many other countries (see Section 2.15). Both types of Caller ID are
enabled/disabled using the +VCID command. Call Waiting Tone detection must be enabled
using the +PCW command to detect and decode Call Waiting Caller ID. When enabled, caller
ID information (date, time, caller code, and name) can be passed to the DTE in formatted or
unformatted form. Inquiry support allows the current caller ID mode and mode capabilities of
the modem to be retrieved from the modem. Type II Caller ID (Call Waiting Caller ID) detection
operates only during data mode in V.92, V.90, V.34, V.32bis, or V.32.
3.15 Worldwide Country Support
Internal modem firmware supports 63 country profiles (see Table 1-2). These country profiles
include the following country-dependent parameters:

Dial tone detection levels and frequency ranges.

DTMF dialing parameters: Transmit output level, DTMF signal duration, and DTMF
interdigit interval.

Pulse dialing parameters: Make/break times, set/clear times, and dial codes are
programmable.

Ring detection frequency range.

Type I and Type II Caller ID detection are supported for many countries. Contact your
local xmodus sales office for additional country support.

Blind dialing enabled/disable.

Carrier transmit level. The maximum, minimum, and default values can be defined to
match specific country and DAA requirements.

Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.

Frequency and cadence of tones for busy, ringback, congested, warble, dial tone 1,
and dial tone 2.

Answer tone detection period.
XM3000S-E00-101
xmodus swiss GmbH
Seite 23 / 43
XM3000S Series Designer’s Guide

Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to the
same number when previous call attempts have failed. Call failure can be detected for
reasons such as no dial tone, number busy, no answer, no ringback detected, voice
(rather than modem) detected, and key abort (dial attempt aborted by user). Actions
resulting from such failures can include specification of minimum inter-call delay,
extended delay between calls, and maximum numbers of retries before the number is
permanently forbidden ("blacklisted").
The country profiles may be altered or customized by modifying the country-dependent
parameters. Additional profiles may also be included. Additional and modified country profiles
are supported by internal SRAM.
3.16 Diagnostics
Diagnostics are performed in response to test commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem, which
loops the data back to the local DTE.
PTT Signal Generation (%TTn Command). Continuous tones or modulation are generated
by the DSP and output through the DAA.
3.17 Low Power Modes
The modem enters a low power mode when no line connection exists and no host activity
occurs for the period of time specified in the S24 register. The modem supports four low power
modes: Idle Mode, Sleep Mode, Deep Sleep Mode, and Stop Mode. The low power mode
entered depends on the setting of the –SLP command.
3.17.1 Idle Mode
In Idle mode, the CPU and SPX clocks stop, and the SSD clock runs at low frequency. The
modem can detect and qualify ring signals and process AT commands. The modem returns to
normal mode upon receiving an AT command or receiving a qualified ring.
3.17.2 Sleep Mode
In Sleep mode, the SPX clock stops, and the CPU and SSD clocks run at low frequency. The
modem can detect and qualify ring signals. The modem cannot process AT commands. The
modem can be awakened by the host sending a single (any) character (typically followed by
an AT command) or by the modem receiving a qualified ring.
XM3000S-E00-101
xmodus swiss GmbH
Seite 24 / 43
XM3000S Series Designer’s Guide
3.17.3 Deep Sleep Mode
In Deep Sleep mode, the SPX and SSD clocks stop, and the CPU clock runs at low frequency.
The modem can detect and qualify ring signals. The modem cannot process AT commands.
The modem can be awakened by the host sending a single (any) character (typically followed
by an AT command) or by the modem receiving a qualified ring.
3.17.4 Stop Mode
In Stop mode, the CPU, SPX and SSD clocks stop. The modem cannot process AT
commands and cannot detect and qualify ring signals. The modem can be awakened by the
host sending a single (any) character (typically followed by an AT command).
XM3000S-E00-101
xmodus swiss GmbH
Seite 25 / 43
XM3000S Series Designer’s Guide
4.
MODEM HARDWARE
4.1
Modem Hardware Interface Signals
The Socket Modem pin assignments with DTE serial TTL interface are shown in Figure 4-1
and are listed in Table 4-1.
4.1.1
Phone Interface
• TIP
• RING
4.1.2
Call Progress Speaker Interface
• Digital speaker output (DSPK); output
4.1.3
Serial DTE Interface
• Serial Transmit Data input (TXD)
• Serial Receive Data output line (RXD)
• Clear to Send output (CTS)
• Received Line Signal Detector output (DCD)
• Ring Indicator output (RI)
• Data Terminal Ready control input (DTR)
• Request to Send control input (RTS)
• Data Set Ready output (DSR)
4.1.4
Modem Hardware Block Diagram
XM3000S-E00-101
xmodus swiss GmbH
Seite 26 / 43
XM3000S Series Designer’s Guide
Figure 4-1. MODULE PINOUT
1
2
TIP
RING
DSPK
AGND
MICRO
VCC
64
63
62
61
Top View
24
25
26
27
28
29
30
31
32
RESET
NC
GND
NC
NC
NC
NC
NC
NC
41
40
39
38
37
36
35
34
33
GND
DTR
DCD
CTS
DSR
RI
TXD
RXD
RTS
Table 4-1. Signal Names
Pin No.
Signal name
1
2
TIP
RING
24
25
26
27
28
29
30
31
32
RESET
NC
GND
NC
NC
NC
NC
NC
NC
XM3000S-E00-101
Pin No.
Signal name
33
34
35
36
37
38
39
40
41
RTS
RXD
TXD
RI
DSR
CTS
DCD
DTR
GND
61
62
63
64
VCC
MICRO
AGND
DSPK
xmodus swiss GmbH
Seite 27 / 43
XM3000S Series Designer’s Guide
4.1.5
Signal Description
Table 4.2. Signal Descriptions
Label
Pin
I/O
VCC
61
I
PWR
Supply Voltage. Connect to +5V for the -5V models.
Connect to 3.3V for the -3V models.
GND
26
41
I
GND
Digital Ground. Connect to Digital Ground on the interface
circuit.
AGND
63
I
GND
Analog Ground. Connect to Analog Ground for the
XM3192S models with FDSP (Micro input and Speaker
Output. For all other models connect to Digital Ground.
IA
Modem Reset. The active low RESET input resets the
Socket Modem logic and returns the AT command set to the
original factory default values and to "stored values" in
NVRAM. RESET is connected to a built-in reset circuit on
the Socket Modem. Reset must be held low for at least 5mS
to activate the reset logic. The modem is ready to use
200mS after the reset.
Connect the reset line to ground through a 1nF capacitor to
ensure good ESD immunity and to comply with ESD tests
according to EN 61000-4-2.
I
I/O Type
Signal Name/Description
RESET
24
TIP
1
IF
TIP Signal from Telco/PTT
RING
2
IF
RING Signal from Telco/PTT
Microphone Input:
MICRO
62
I
I(DA)
XM3192S models: Single-ended analog data input from the
microphone circuit.
XM30XXS models: This pin is not connected.
Analog Speaker Output:
DSPK
64
O
O(DF)
XM3192S models: This is the speaker output of the voice
codec. This analog output reflects the selected analog
signal. When the speaker is turned off, DSPK is clamped to
the voltage at the VC pin. The DSPK output can drive
impedance as low as 150 Ω.
XM30XXS models: This is the Modem Speaker Digital
Output. The DSPK digital output reflects the received analog
input signal digitized to TTL high or low level by an internal
comparator.
XM3000S-E00-101
xmodus swiss GmbH
Seite 28 / 43
XM3000S Series Designer’s Guide
Table 4-3. Signal Descriptions (Cont'd)
Label
Pin
I/O
I/O Type
Signal Name/Description
The Serial interface signals are TTL-level signals.
TXD
RXD
CTS
35
34
38
I
O
O
IB
Transmitted Data (EIA BA/ITU-T CT103). The DTE uses
the TXD line to send data to the modem for transmission
over the telephone line or to transmit commands to the
modem.
OA
Received Data (EIA BB/ITU-T CT104). The modem uses
the RXD line to send data received from the telephone line
to the DTE and to send modem responses to the DTE.
During command mode, RXD data represents the modem
responses to the DTE.
OA
Clear To Send (EIA CB/ITU-T CT106). CTS output ON
(low) indicate that the modem is ready to accept data from
the DTE. In error correction or normal mode, CTS is always
ON (low) unless RTS/CTS flow control is selected by the
&Kn command.
DCD
39
O
OA
Data Carrier Detected (EIA CF/ITU-T CT109). During
normal operation, when AT&C0 command is not in effect,
DCD output is ON when a carrier is detected on the
telephone line or OFF when carrier is not detected.
RI
36
O
OA
Ring Indicator (EIA CE/ITU-T CT125). RI output ON (low)
indicates the presence of an ON segment of a ring signal on
the telephone line.
IB
Data Terminal Ready (EIA CD/ITU-T CT108). The DTR
input is turned ON (low) by the DTE when the DTE is ready
to transmit or receive data. DTR ON prepares the modem to
be connected to the telephone line, and maintains the
connection established by the DTE (manual answering) or
internally (automatic answering). DTR OFF places the
modem in the disconnect state under control of the &Dn and
&Qn commands.
IB
Request To Send (EIA CA/ITU-T CT105). RTS input ON
(low) indicates that the DTE is ready to send data to the
modem. In the command state, the modem ignores RTS.
The modem ignores RTS unless RTS/CTS flow control is
selected by the &Kn command.
OA
Data Set Ready (EIA CC/ITU-T CT107). DSR indicates
modem status to the DTE. DSR OFF (high) indicates that
the DTE is to disregard all signals appearing on the
interchange circuits except Ring Indicator (RI). DSR output
is controlled by the AT&Sn command.
DTR
RTS
DSR
40
33
37
XM3000S-E00-101
I
I
O
xmodus swiss GmbH
Seite 29 / 43
XM3000S Series Designer’s Guide
4.1.6
Digital Electrical Characteristics
Parameter
Symbol
Input High
Voltage
Min.
Typ.
VIH
-
2.35
2.00
Type IA
Type IB
Max.
Units
Vdc
5.25
5.50
VIL
Input Low
Voltage
Vdc
0
0
Type IA
Type IB
Output High
Voltage
-
0.40
0.80
VOH
Vdc
2.4
Type OA
Output Low
Voltage
-
3.3
IOL = -2 mA
Vdc
VOL
0
Type OA
Test
Condition
-
0.4
IOL = 2 mA
Circuit Type:
Type IA
Type IB
RESET input, active low
Digital input, TTL logic, +5V tolerant, 47K internal pull-up
Type OA
Digital output, TTL, 3.3V logic
Notes:
1. Test Conditions:
4.1.7
VCC = ±5%, TA = 0°C to 70°C,
VDD = +3.3 +/- 0.3 VDC
External Load: = 50 pF + one TTL load.
Analog Electrical Characteristics
Name
Type
Characteristic
Value
SPKR
O(DF)
Minimum Load
Maximum Capacitive Load
Output Impedance
AC Output Voltage Range
Reference Voltage
DC Offset Voltage
MICV
I(DA)
Input Impedance
AC Input Voltage Range
Reference Voltage
> 70 kΩ
1.1 V P-P
+1.35 VDC
IF
Ring Detect Sensitivity
Ring Detect Peak Current
Ring Detect Idle Current
Loop Current
Ring Equivalency Number (REN)
> 38 VRMS
> 100 μV
< 50 nA
< 100 mA
1.0 Bel
TIP
RING
XM3000S-E00-101
xmodus swiss GmbH
150 Ω
0.01 μF
10 Ω
1.4 V P-P
+1.35 VDC
± 20 mV
Seite 30 / 43
XM3000S Series Designer’s Guide
4.1.8
4.1.9
Operating Conditions
Parameter
Symbol Min.
Typ.
Max.
Units
Supply Voltage 3.3V models
VDD
3.00
-
3.60
Vdc
Supply Voltage 5.0V models
VDD
4.75
-
5.25
Vdc
Operating Temperature
TA
0
-
70
°C
Supply Current Off Hook
ID
-
83
-
mA
Supply Current Idle Mode
ID
-
13
-
mA
Supply Current Sleep Mode
ID
-
5
-
mA
Supply Current Stop Mode
ID
-
3
-
mA
Power
W
-
434
mW
Absolute Maximum Ratings
Parameter
Symbol Min.
Storage Temperature
TSTG
-55
-
+125
°C
Supply Voltage
VDD
-0.5
-
+6.0
Vdc
Input Voltage
VIN
-0.5
-
5.75
Vdc
Static Discharge Voltage
VESD
+/- 2500
Vdc
Latch-up Current
ITRIG
+/- 400
mA
XM3000S-E00-101
Typ.
xmodus swiss GmbH
Max.
Units
Seite 31 / 43
XM3000S Series Designer’s Guide
4.2
DAA Interface
The Socket Modem is configured to be an on-board DAA (World Class DAA). Provide TIP and
RING signals from the Telco jack to pins 1 and 2 of the Socket Modem. Only EMI suppression
components may be used. If other components are used, the PTT certification for these
Socket Modems will no longer apply, and recertification will be required. The recommended
Telco interface for World Class Socket Modems is shown in Figure 4-4.
Telephone networks can have high ring voltages and even lightning surges of many kilovolts.
One purpose of a DAA is to isolate the low voltage or earth referenced system from the
telephone network. This isolation is achieved by physically separating the line side and the
system side using an isolation barrier. The line side of the DAA circuitry is commonly referred
to as telephone network voltage (TNV) and the system side components is commonly referred
to as safety extra-low voltage (SELV).
TIP and RING signal traces are line side (TNV) circuitry and must be isolated from system
side (SELV) circuitry. The dielectric breakdown of air is approximately 3000 volts/mm. This
breakdown constant can be effectively reduced by dust particles and other contaminants,
which may accumulate over the course of time, between two metal traces separated by an air
gap. The clearances provided are geared towards providing adequate margin with respect to
longitudinal lightning surges up to 5kV.
To keep good isolation, the TIP and RING traces are to be no closer than 3.0 mm from any
other traces (SELV circuitry). Keep also a minimum separation distance between TIP and
RING of 0.51mm (0.020”). This rule represents an absolute minimum requirement. Of course,
a larger clearance is acceptable and desirable, if the PCB area permits it.
FIGURE 4-4. RECOMMENDED TELEPHONE LINE INTERFACE FOR U.S. AND WORLD CLASS MODEM.
1
2
3
4
5
6
1
2
SOCKET MODEM
XM3000S-E00-101
NC
OT
T
R
OR
NC
RJ11
xmodus swiss GmbH
Seite 32 / 43
XM3000S Series Designer’s Guide
4.3
Audio / Speaker Interface
Audio output is useful for monitoring the modem's call-progress tones and modem system
debugging, as well as for full featured Voice applications. The two audio amplifier circuits
shown below are similar in layout but differ in audio quality. The Sounducer circuit is suitable
for basic call-progress-tone monitoring, while the speaker circuit is appropriate for Voice
applications.
In Figure 4-5, the audio amplifier drives a piezo-electric Sounducer. The SPKR signal from the
Socket Modem is fed into an audio amplifier. The 10 μF capacitor between pin 1 and pin 8 of
the amplifier bypasses internal circuitry to achieve the maximum gain. The second 10 μF
capacitor, between pin 5 of the amplifier and the Sounducer, is used to keep the 2.5 VDC bias
of the op amplifier from going into the Sounducer.
In Figure 4-6, the audio amplifier drives an 8Ω speaker. In this circuit, the amplifier's bypass
circuit includes a 760 Ω resistor, and the bias-blocking capacitor changes to 22 μF.
+5V
0.1uF
10uF
6
SPKR
(Pin 64)
0.1uF
1
2
5
7
AGND
(Pin 63)
10uF
LM386
3
8
4
50 Ohm sounducer
FIGURE 4-5. SOUNDUCER DRIVER CIRCUIT
XM3000S-E00-101
xmodus swiss GmbH
Seite 33 / 43
XM3000S Series Designer’s Guide
+5V
0.1uF
10uF
6
SPKR
(Pin 64)
0.1uF
1
2
5
7
AGND
(Pin 63)
22uF
LM386
3
8
4
8 Ohm speaker
760
FIGURE 4-6. SPEAKER DRIVER CIRCUIT
4.3.1
Audio Interface for XM3192S Models.
Figure 4-7 describes the supporting audio circuitry.
64
P1
R1
1uF
L1
120R@100MHz
33
63
SPEAKER AMP.
62
61
L2
1uF
120R@100MHz
SOCKET MODEN
MICRO
R2
2K2
R3
+3.3V
10K
10uF
FIGURE 4-7. AUDIO INTERFACE CIRCUIT.
XM3000S-E00-101
xmodus swiss GmbH
Seite 34 / 43
XM3000S Series Designer’s Guide
4.4
Reset Interface
4.4.1
Recommended Reset Circuit
This signal is used to force a reset procedure by providing low level during at least 100uS.
This signal has to be considered as an emergency reset only. A reset procedure is already
driven by an internal hardware during the power-up sequence.
If no external reset is necessary this input can be left open. If used (emergency reset), it has to
be driven by an open collector or an open drain.
RESET: PIN 24
SWITCH RESET
NPN
Switch Reset
Reset (Pin 24)
Reset Status
1
0
Active
0
1
Inactive
Additional comments on RESET:
The reset process is activated either by the external Reset signal OR by an internal signal
(coming from the internal RESET generator). This automatic reset is activated at power-up.
The module remains in reset mode as long as the reset signal is held low. As soon as the
reset is complete, the AT interface answers “OK” to the application.
XM3000S-E00-101
xmodus swiss GmbH
Seite 35 / 43
XM3000S Series Designer’s Guide
5.
DESIGN CONSIDERATIONS
Good engineering practices must be adhered to when designing a printed circuit board (PCB)
containing the Socket Modem module. Suppression of noise is essential to the proper
operation and performance of the modem itself and for surrounding equipment.
Two aspects of noise in an OEM board design containing the Socket Modem module must be
considered: on-board/off-board generated noise that can affect analog signal levels and
analog-to-digital
conversion
(ADC)/digital-to-analog
conversion
(DAC),
and
on-board
generated noise that can radiate off-board. Both on-board and off-board generated noise that
is coupled on-board can affect interfacing signal levels and quality, especially in low level
analog signals. Of particular concern is noise in frequency ranges affecting modem
performance.
On-board generated electromagnetic interference (EMI) noise that can be radiated or
conducted off-board is a separate, but equally important, concern. This noise can affect the
operation of surrounding equipment. Most local governing agencies have stringent certification
requirements that must be met for use in specific environments.
Proper PC board layout (component placement, signal routing, trace thickness and geometry,
etc.), component selection (composition, value, and tolerance), interface connections, and
shielding are required for the board design to achieve desired modem performance and to
attain EMI certification.
The aspects of proper engineering practices are beyond the scope of this designer's guide.
The designer should consult noise suppression techniques described in technical publications
and journals, electronics and electrical engineering text books, and component supplier
application notes. Seminars addressing noise suppression techniques are often offered by
technical and professional associations as well as component suppliers.
5.1
PC Board Layout Guidelines
5.1.1
General
1. In a 2-layer design, provide an adequate ground grid in all unused space around and under
components (judiciously near analog components) on both sides of the board, and connect
in such a manner as to avoid small islands. A grid is preferred over a plane to improve
solderability. Typically, the grid is composed of 0.012 in. traces and 0.012 in. spaces on a
0.025 in. grid. Connect each grid to other grids on the same side at several points and to
grids on the opposite side through the board at several points. Connect Socket Modem
DGND and AGND pins to the ground grid.
XM3000S-E00-101
xmodus swiss GmbH
Seite 36 / 43
XM3000S Series Designer’s Guide
2. As a general rule, route digital signals on the component side of the PCB and the analog
signals on the solder side. The sides may be reversed to match particular OEM
requirements. Route the digital traces perpendicular to the analog traces to minimize signal
cross coupling.
3. Route the modem signals to provide maximum isolation between noise sources and noise
sensitive inputs. When layout requirements necessitate routing these signals together, they
should be separated by neutral signals.
4. All power and ground traces should be at least 0.05 in. wide.
5. TIP and RING signal traces are to be no closer than 3mm (0.1") from any other traces for
European applications. 3 mm spacing must be used if the host board is to support both
U.S. and European Socket Modems.
6. If the Socket Modem is mounted flush with the host PCB, the host PCB should be clear of
all traces directly underneath the Socket Modem oscillator section. It is strongly suggested
that the Socket Modem is mounted at least 0.130 inch above the host board. (See section
4.4)
5.1.2
Electromagnetic Interference (EMI) Considerations
The following guidelines are offered to specifically help minimize EMI generation. Some of
these guidelines are the same as, or similar to, the general guidelines but are mentioned again
to reinforce their importance. In order to minimize the contribution of the Socket Modem-based
design to EMI, the designer must understand the major sources of EMI and how to reduce
them to acceptable levels.
1.
Keep traces carrying high frequency signals as short as possible.
2.
Provide a good ground plane or grid. In some cases, a multilayer board may be required
with full layers for ground and power distribution.
3.
Decouple power from ground with decoupling capacitors as close to the Socket Modem
module power pins as possible.
4.
Eliminate ground loops, which are unexpected current return paths to the power source
and ground.
5.
Decouple the telephone line cables at the telephone line jacks. Typically, use a
combination of series inductors, common mode chokes, and shunt capacitors. Methods
to decouple telephone lines are similar to decoupling power lines, however, telephone
line decoupling may be more difficult and deserves additional attention. A commonly used
design aid is to place footprints for these components and populate as necessary during
performance/EMI testing and certification.
XM3000S-E00-101
xmodus swiss GmbH
Seite 37 / 43
XM3000S Series Designer’s Guide
6.
Decouple the power cord at the power cord interface with decoupling capacitors. Methods
to decouple power lines are similar to decoupling telephone lines.
7.
Locate high frequency circuits in a separate area to minimize capacitive coupling to other
circuits.
8.
Locate cables and connectors so as to avoid coupling from high frequency circuits.
10. If a multilayer board design is used, make no cuts in the ground or power planes and be
sure the ground plane covers all traces.
11. Minimize the number of through-hole connections on traces carrying high frequency
signals.
12. Avoid right angle turns on high frequency traces. Forty-five degree corners are good;
however, radius turns are better
13. On 2-layer boards with no ground grid, provide a shadow ground trace on the opposite
side of the board to traces carrying high frequency signals. This will be effective as a high
frequency ground return if it is three times the width of the signal traces.
14. Distribute high frequency signals continuously on a single trace rather than several traces
radiating from one point.
5.2
Other Considerations
The pins of all Socket Modems are grouped according to function. The DAA interface, Host
interface, and LED interface pins are all conveniently arranged, easing the host board layout
design. Xmodus swiss has tested each of the XM3000S Socket Modems for compliance with
TBR21. The certificates apply only to designs that route TIP and RING (pins 1 and 2) directly
to the Telco jack. Only specified EMI filtering components are allowed on these two signals as
shown in figure 3-3.
5.3
Manufacturing Considerations
The Socket Modem has been designed to be mounted onto the host board in one of two ways.
The first method consists of soldering two 32-pin strip sockets to the host board and inserting
the Socket Modem into the sockets. A suggested part number for the 32-pin socket is Sam
Tec SMM-132-01-F-S. The second way is to solder the Socket Modem directly to the host
board. The most efficient way to do this is through a wave solder process. The recommended
hole size for the Socket Modem pins is 0.036 in. ±0.003 in. in diameter. Spacers can be used
to hold the Socket Modem vertically in place during the wave solder process. A spacer should
be placed on pin 32 and pin 64 of the Socket Modem. A suggested part number for the spacer
is BIVAR 938-0.130 for P1(0.310in) option Socket Modems. The spacers can be left on
permanently and will not effect operation. Socket Modems can be put through a water wash
process.
XM3000S-E00-101
xmodus swiss GmbH
Seite 38 / 43
XM3000S Series Designer’s Guide
6.
PACKAGE DIMENSIONS
Package Dimensions are shown in Figure 6-1.
64.5mm (2.54“)
26.5mm (1.04“)
1,6mm
4,0 mm
0.5mm
2,0mm
6,5mm
24.0mm
62.0mm
Figure 6-1. XM3000S Socket Modem Physical Dimensions
XM3000S Dimensions
Width
Height
Length
Weight
Operating temperature
Storage temperature
Humidity
XM3000S-E00-101
Europe
26,5 mm
12.1 mm
64,5 mm
~ 12 g
0...70 °C
–10...85 °C
90% non-condensing
xmodus swiss GmbH
US
~1.05"
~0.5"
~2.55"
~ 0.42 oz
32...160 °F
14...185 °F
90% non-condensing
Seite 39 / 43
XM3000S Series Designer’s Guide
7.
SOCKET MODEM APPROVALS
The Socket Modem module is approved as a host-independent modem card. To maintain type
approvals, permits and/or licenses valid, the guidelines described in this document must be
followed.
7.1
Considerations for Telecom Approvals
The Socket Modem has been assessed and has been found to comply with the relevant
harmonized standards as defined by the European ETSI Directive (ETSI TC-TE).
These standards are:
7.1.1
TS103021-1/2, TBR21
Electromagnetic Interference (EMI) Considerations
The Socket Modem can be connected to the Public Switched Telephone Network (PSTN)
either
a)
by using a 2-wire flying cable to connect pins 1 and 2 of the module to an RJ-11
connector which can be assembled in a suitable location of the host system enclosure,
OR
b)
by providing traces on the host system motherboard for the PSTN connection signals
(TIP and RING) between the card and an RJ-11 connector
If connection option a) is used, the cable and its installation inside the host system must be in
accordance with the guidelines in IEC950/EN60950 (e.g. the insulation material must
withstand electric strength tests as described in section 3.4).
If connection option b) is used, NO additional components except those used for EMI filtering
(specified in figure 3-3) must be connected to the TIP and RING signals. Other components
not intended for use with this design may affect the network access characteristics of the
modem and may therefore invalidate the type approvals, permits and/or licenses.
In both cases, for the connection between the host and the PSTN wall connector, a cable with
RJ-11 modular jack and an appropriate national plug must be used. Note that in Germany, an
F-coded connector/plug must be used (this is one of the two typical plugs used for PSTN
connection in Germany, the other type is called N-coded).
XM3000S-E00-101
xmodus swiss GmbH
Seite 40 / 43
XM3000S Series Designer’s Guide
7.2
Considerations for Electrical Safety
7.2.1
Conditions for Maintaining Safety Compliance (European Countries)
The Socket Modem has been assessed with respect to electrical safety and has been found to
comply with relevant standards as defined by the European Low Voltage Directive
(72/23EEC). The particular standard is EN 60950-1:2001.
The card is rated as Class III equipment and it is intended for use in Pollution Degree 2
environments only [see EN60950-1:2001, 2.10.4]. Material Group IIIa or IIIb (Comparative
Tracking Index below 400 according o IEC 112, method A) is assumed for any host system
PCB that has traces and/or circuitry with TNV potential.
It is assumed that the modem card will only be assembled in a host system unit that complies
with IEC60950/EN60950. Some particular requirements are [see EN60950-1:2001, 2.1.1, 2.2,
2.3, 2.9, 2.10 and 4.7.3.2]:
-
the host system must have a compliant fire enclosure (e.g. made of material with
flammability class 94V-1 or better).
-
7.2.2
the power supply unit of the host system must have double or reinforced insulation.
Power Supply [EN60950-1:2001, 1.6]
Before installing the Socket Modem in a host system, the installer must ensure that the power
drawn by the card, together with the host and any auxiliary cards drawing power from the host
is within the rating of the host power supply unit. The Socket Modem's power consumption is
typically 0.5 W (+5.0 Vdc).
7.2.3
Clearances and Creepage Distances (EN60950-1:2001)
Clearances, Creepage Distances and Distances through Insulation [EN60950-1:2001, 2.10.3
and 2.10.4]
SELV
RS 232
a/b
TNV3
This card must be installed such that with the exception of the connections to the host,
clearance and creepage distances shown in the table below are maintained between
a) the TNV3 area of the card (the DAA) and conductive parts of other assemblies inside
the host,
XM3000S-E00-101
xmodus swiss GmbH
Seite 41 / 43
XM3000S Series Designer’s Guide
b) if applicable, the PSTN connection traces (TIP and RING) routed through the host
system motherboard and any other conductive area (i.e. traces, through holes, SMD
pads, copper areas, etc.) on that motherboard,
which use or generate a voltage shown in the table below (values only for secondary
circuits):
EN60950:2000 Table 2K / 2L
Clearance (mm)
Creepage (mm)
Voltage used or
Generated by Host or
Other cards
1.0
1.5 (2.4)
Up to 125 Vrms or Vdc
2.0
2.5 (4.0)
Up to 250 Vrms or Vdc
2.5
3.2 (5.0)
Up to 300 Vrms or Vdc
The larger distances shown in brackets applies for Pollution Degree 3 environments (where
the local environment within the host is subject to conductive pollution or dry non-conductive
pollution, which could become conductive due to expected condensation).
The same clearance and creepage distances also apply between TNV3 areas of the card and
earth connections inside the host system. Clearance and creepage between primary (mains)
and secondary circuits according EN 60950-1:2001, clause 2.10.3.2 table 2H and clause
2.10.4 table 2L. Minimum distances between primary and secondary circuits (f.g. for mains
voltage 230 VAC):
Clearance = 4 mm
Creepage = 5 mm
Failure to maintain these minimum distances would invalidate the approval.
NOTE: For a host or other expansion cards fitted in the host using or generating voltages
greater than 300 V (rms or dc), advice from a competent telecommunications safety engineer
must be obtained.
If these clearance and creepage distances cannot be provided inside the host due to space
limitations, a dielectric material may be used as a physical insulation barrier. The dielectric
material used in this insulation must have a thickness of at least 0.4mm.
After installation (or implementation) of the Socket Modem inside a host system, it is
recommended that a competent telecommunications safety engineer inspects the
complete system to ensure that safety compliance is maintained.
XM3000S-E00-101
xmodus swiss GmbH
Seite 42 / 43
XM3000S Series Designer’s Guide
7.3
Considerations for EMC
7.3.1
EMC Compliance (European Countries)
The Socket Modem has been assessed with respect to emission of and immunity to
electromagnetic disturbances and has been found to comply with the relevant harmonized
standards as defined by the European EMC Directive (89/336/EEC).
These standards are:

Generic emission standards which refers to
EN 55022:1998 +A1:2000, Class B

Generic immunity standards which refers to
EN 55024:1998 +A1:2001
EN 61000-6-2:2001 (industrial environment)
7.3.2
Installation in Host Systems (European Countries)
It is assumed that the Socket Modem will only assemble in host systems that comply with the
EMC Directive.
As per definition of the EMC Directive, the card and its host system will constitute an
"installation" similar to e.g. a PC card modem installed in a personal computer. Therefore, if
the host system complies with the EMC Directive, there should be no need for verifying
continued compliance of the complete system.
However, note that it is the responsibility of the professional installer of Socket Modem to
ensure that the complete system placed on the market complies with the Directive.
XM3000S-E00-101
xmodus swiss GmbH
Seite 43 / 43
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising