User`s manual

U.S. Robotics I-modem Command Reference

Appendix A: Alphabetic Command Summary • Page A-39

S28 8 Sets the duration in tenths of a second of the extra 3000/600 Hz answer

tones sent during V.32 handshaking. This gives V.32 modems additional

time to connect in V.32 mode before timing out.

If there is difÞculty answering older, manually operated V.32 modems (for

example, modems that require a button to be pushed in order to dial, try

lengthening the duration of the extra tones).

Setting S28 to zero eliminates the extra tones resulting in a faster connect

time if, for example, the I-modem is set to use V.21 modulation (300 bps) or

V.23 modulation (1200 bps).

S34 0 Bit-mapped register. See Chapter 1, Using the A

T Command Set, for

instructions about how to set bit-mapped registers.

Bit Value Result

0 1 Disable V.32bis. Used for troubleshooting; U.S.

Robotics Technical Support may ask you to disable

V.32bis for testing purposes.

1 2 Disable the I-modem's enhanced, proprietary V.32bis

modulation. Used for troubleshooting.

2 4 Disable the faster retrains that occur during propri-

etary V.32terbo modulation. Used for troubleshoot-

ing.

Table AÐ1. S-register

s: Their Functions and Default Settings