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S11
Tone Dialing Spacing and Duration
Unit: 1 ms
Range: 1–255 (U.S.A.)
Default: 70 (U.S.A.)
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.
80–255 (Canada, U.K., International)
80 (Canada, U.K., International)
Chapter 4 - S-Registers
60
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