User Guide ISDN Terminal Adapter MTA128ST-USB

MultiModemISDN User Guide

through the serial port (either sent or received). Disable the inactivity timer

by setting S30=0, which is the factory default setting. S30 currently works for

+ all protocols EXCEPT V.110.

S-register: S31

Function: Maximum Redial Timeout Value

Unit: 1 minute

Range: n=0 Does not try to redial

n=1–255

Default: 30 (30 minutes)

Description: Sets the maximum redial timeout value for attempts to add a second channel to a

MLPPP data call. Once the maximum timeout is reached, there are no further attempts

to redial. Re-dialing occurs if a call attempt fails due to the host being busy or not

answering. The first redial timeout period is 1 minute. If re-dialing fails after 1 minute,

the next redial timeout is 3 minutes. If re-dialing fails after 3 minutes, the next redial

timeout is 5 minutes. If re-dialing fails after 5 minutes, subsequent redial timeouts occur

every 5 minutes, up to the maximum redial timeout value (S31).

S-Register: S32

Function: Escape Sequence Timeout

Unit: 100 ms

Range: 0–255

Default: 20

Description: Sets the time allowed in an escape sequence from the receipt of the A in AT to the receipt

of the carriage return. If the S32 time interval expires before you press ENTER, the

escape sequence ends. The default time is 2 seconds.

S-Register: S34

Function: Maximum Escape Sequence Length

Unit: Decimal ASCII code

Range: 0–10

Default: 2

Description: Sets the maximum character length of the escape sequence, not including +++AT. For

example, a character length of S34=2 allows two characters after +++AT (e.g.,

+++ATH0). Conversely, an invalid escape sequence (too many characters placed in the

command string) passes through as data (e.g., +++atili2). The maximum length of the

escape sequence is 10 characters.

S-Register: S44

Function: POTS Port Ring Frequency

Unit: Decimal ASCII code

Range: 2–4

Default: 2 (25 Hz)

Description: Controls the ring frequency from the POTS port. S44=n where:

n=2 25 Hz ring frequency

n=3 20 Hz ring frequency

n=4 16.67 Hz ring frequency