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DS28-L189-061

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

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.

Call Progress Tone Detection

Ringback, equipment busy, congested tone, warble tone, and progress tones can be detected in accordance with the

applicable standard.

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.

Ring Detection

A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave input.

Billing Protection

When the modem goes off-hook to answer an incoming call, both transmission and reception of data are prevented for 2

seconds (data modem) or 4 seconds (fax adaptive answer) to allow transmission of the billing tone signal.

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 2-1).

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 2-1).

Table 2-1. +MS Command Automode Connectivity

<mod>

Modulation

Possible Rates (bps) 1

Notes

V21

V22

V22B

V23

V32

V32B

V34

V90

K56

B103

B212

V.21

V.22

V.22 bis

V.23

V.32

V.32 bis

V.34

V.90

K56flex

Bell 103

Bell 212

300

1200

2400 or 1200

1200

9600 or 4800

14400, 12000, 9600, 7200, or 4800

33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,

14400, 12000, 9600, 7200, 4800, or 2400

56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,

45333, 42667, 41333, 40000, 38667, 37333, 36000, 34667,

33333, 32000, 30667, 29333, 28000

56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,

40000, 38000, 36000, 34000, 32000

300

1200

See Note 2

Default for /14

models

Default for /33

models

Default for /56

models

Notes:

1. See optional <automode>, <min_rate>, and <max_rate> subparameters for the +MS command.

2. For V.23, originating modes transmit at 75 bps and receive at 1200 bps; answering modes transmit at 1200 bps and receive at

75 bps. The rate is always specified as 1200 bps. V.23 half duplex is not supported.

3. If the DTE speed is set to less than the maximum supported DCE speed in automode, the maximum connection speed is

limited to the DTE speed.

2-2

Conexant

100490C

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