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DS28-L189-071

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

1.3.3 Operating Modes

Data/Fax Modes

In V.90/K56flex data modem mode (/56 models), the modem can receive data from a digital source using a V.90- or K56flex-

compatible central site modem at line speeds up to 56 kbps. Asymmetrical data transmission supports sending data at line

speeds up to V.34 rates. This mode can fallback to full-duplex V.34 mode and to lower rates as dictated by line conditions.

In V.34 data modem mode (/56 and /33 models), 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.32 bis in accordance with PN2330. All tone and pattern detection functions required by the applicable

ITU or Bell standards are supported.

In V.32 bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.

In V.22 bis fast connect data mode, the modem can connect at 2400 bps with a very short training time, which is very efficient

for small data transfers.

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.

Synchronous Access Mode (SAM) - Video Conferencing

V.80 Synchronous Access Mode between the modem and the host/DTE is provided for host-controlled communication

protocols, e.g., H.324 video conferencing applications.

Voice-call-first (VCF) before switching to a videophone call is also supported.

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 (see Section 2.13).

SmartDAA technology allows a single PCB design and single BOM to be homologated worldwide. Advanced features such as

extension pickup detection, remote hang-up detection, line-in-use detection, and digital PBX detection are supported.

Country code IDs are defined by ITU-T T.35.

Internal ROM includes default profiles for 29 countries including TBR21-compliant profiles. These profiles can be overridden

by modified values stored in external serial EEPROM. If optional external ROM/flash ROM is used, a maximum of 31 country

profiles can be stored in external ROM/flash ROM. Additional country profiles can also be stored in external serial EEPROM

(request additional country profiles from a Conexant Sales Office). The default countries supported are:

Country

Australia

Austria

Belgium

Brazil

China

Denmark

Finland

France

Germany

Greece

Country Code

09

0A

0F

16

26

31

3C

3D

42

46

Country

India

Ireland

Italy

Japan

Korea

Malaysia

Mexico

Netherlands

Norway

Poland

Country Code

53

57

59

00

61

6C

73

7B

82

8A

Country

Portugal

Singapore

South Africa

Spain

Sweden

Switzerland

Taiwan

United Kingdom

United States

Country Code

8B

9C

9F

A0

A5

A6

FE

B4

B5

1-6

Conexant

100490C

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