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AT Command Set and S-Registers
5-253910-A2-GN32-30 November 1996
Table 5-4
(11 of 13)
391x Series S-Registers
S-Register
DCP LCD
Command
Sequence
Description
S89 V.42 Automatic Request for Retransmission (ARQ) Window Size
Increase. Register allows the ARQ window size to be set to a value
from six frames to fifteen frames.
For best performance, this register should remain at its default setting
of six frames (ATS89 = 0). The only reason to change it is for satellite
delays.
Register has the following values:
0 = six frames
1 = seven frames
2 = eight frames
3 = nine frames
4 = ten frames
5 = eleven frames
6 = twelve frames
7 = thirteen frames
8 = fourteen frames
9 = fifteen frames
The factory setting is 0 (six frames).
This command only applies when the modem connects using V.42bis
data compression or V.42 error control. If the modem is configured for
Direct mode, MNP mode, Buffer mode, or Synchronous operation, this
command is invalid.
This command does not have a front panel equivalent.
S90 DTE Rate = VF. Register allows the DTE’s data rate to be equal to the
VF (telephone line) data rate. If Enabled, the data rate between the
DTE and modem is the same as the modem’s VF data rate. As a
result, when the modem is in Data mode, the speed of the data
passed between the modem and DTE occurs at the VF data rate.
Register has the following values:
0 = Disable
1 = Enable
The factory setting is Disable.
Configure\Edit\
DTE Interface
S91 Cellular Enhancement. Register allows the modem to use
non-standard techniques to enhance V.42 operation for cellular
applications. It is still compatible, however, with modems which do not
have the cellular enhancement implemented or enabled.
Register has the following values:
0 = Disable
1 = Enable
The factory setting is Disable.
Configure\Edit\
V42/MNP/Buffer