User's Guide

COMSPHERE 3821Plus Modem
4-24 February 1998 3821-A2-GB20-30
Table 4-2
(9 of 10)
3821
Plus S-Registers
S84 – AT Command Mode
Determines how the modem responds to valid and invalid AT commands. The selections No ERROR and No Strap or
ERROR permit installation into applications that are customized for a different modem.
Register has the following values:
0 = Normal.
1 = No ERROR. The modem executes all valid commands, ignores invalid commands, and never issues an ERROR
message.
2 = No Strap or ERROR. The modem ignores all configuration commands, but always issues an OK response message.
The value of S84 is Normal when the modem is shipped. The value of S84 is not affected by factory default templates.
S85 – Fast Disconnect
Allows the modem to disconnect immediately after receiving a disconnect command.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.
S88 – Straps When Disconnected
Determines if configuration options in the Active (Saved) configuration area are loaded to Active (Operating) when the
modem disconnects.
Register has the following values:
0 or 231 = No Change
1 or 232 = Reload
The value of S88 is No Change when the modem is shipped. The value of S88 is not affected by factory default
templates.
S89 – V.42 ARQ Window Size Increase
Register allows the V.42 Automatic Request for Transmission (ARQ) window size to be set to a value from 6 to 15 frames
to accommodate satellite delays.
Register has the following values:
0 = Automatic Adjust (6–15 frames)
1 = 7 frames
2 = 8 frames
3 = 9 frames
D D
D D
9 = 15 frames
This command applies only to connections made using V.42bis data compression or V.42 error control.
Factory setting is Automatic Adjust.
S90 – DTE Rate = VF Rate
Register forces the DTE (computer) data rate to be equal to the VF (telephone line) data rate.
Register has the following values:
0 = Disable
1 = Enable
Factory setting is Disable.