Chapter 4 - S-Registers

S11

Tone Dialing Spacing and Duration

 

Unit: 1 ms

 

Range: 1–255 (U.S.A.)

 

80–255 (Canada, U.K., International)

 

Default: 70 (U.S.A.)

 

80 (Canada, U.K., International)

 

S11 sets the speed of tone dialing (spacing and tone duration times). The default value is

 

70 units for domestic models and 80 units for Canadian and International models, where

 

each unit is one ms. In other words, for domestic modems, each tone is sustained for 70 ms

 

followed by a 70 ms pause. The minimum S11 value allowed by most telephone systems is

 

50 ms (50 units). Very few telephone systems can handle anything faster than that. The

 

maximum S11 value is 255 ms (255 units).

S13

Remote Configuration Escape Character

 

Unit: Decimal

 

Range: 0–127

 

Default: 37 (%)

 

S13 defines the remote configuration escape character by its decimal ASCII code. The S13

 

default is the percent character (decimal 37). When you enter the S13-defined character

 

three consecutive times from a remote site, your modem responds with its remote

 

configuration procedure. A value of 0 disables remote configuration.

S17

Changing Break Time

 

Unit: 10 ms

 

Range: 1–255

 

Default: 25 (250 ms)

 

S17 defines the break time (space) the modem sends the DTE when it receives a break

 

signal from a remote modem. Break duration is adjustable in 10 millisecond increments.

 

The default is set to 25, for a 250 millisecond break.

S24

PBX/CBX Disconnect Drop Time for DSR/CTS/CD

 

Unit: 50 ms

 

Range: 0–255

 

Default: 20 (1 second)

 

Some PBX and CBX phone systems require the modem’s DSR, CTS, and/or CD signals to

 

drop briefly when calls are disconnected. The MT2834MR6’s &R, &S, and &C commands

 

can cause the modem to drop these signals for a specified time upon disconnect, and then

 

bring the signals up again. S24 defines the length of time that the signals drop. The default

 

setting of 20 results in a one-second drop time, which is what most PBX/CBX systems with

 

this requirement need.

S25

DTR Dropout Time

 

Unit: 100 ms

Range: 0, 1–255

Default: 0 (50 ms)

S25 sets the amount of time that DTR must be dropped before the modem disconnects. Typically, a disconnect occurs when DTR is dropped for 50 milliseconds or more. This dropout time can be increased up to a maximum of 25.5 seconds. The S25 unit value for zero is 50 ms. For values from 1 through 255, the unit value is 100 ms.

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Multi-Tech Systems MT2834MR6 manual Maximum S11 value is 255 ms 255 units