User's Guide

AT Commands and S-Registers
4-233821-A2-GB20-30 February 1998
Table 4-2
(8 of 10)
3821
Plus S-Registers
S76 – Autorate (Dial Line)
Determines if the Autorate function is used on dial lines when connected in V.32bis, V.34 terbo , or V.34 mode. Autorate
allows the modem to adjust line speed due to varying VF line quality.
Register has the following values:
0 = Enable
1 = Disable
2 = Start at 4800 bps (V.32bis only)
3 = Start at 9600 bps (V.32bis only)
Factory setting is enable.
S77 – DTR Alarm Reporting
Register determines whether an alarm is sent to the 6800 Series NMS controller when the DTR signal has been Off for
more than 10 seconds.
Register has the following values:
0 = Disable
1 = Enable
The value of S77 is Disable when the modem is shipped. The value of S77 is not affected by factory default templates.
S78 – Automode (Dial Line)
If enabled, automode permits the modem to automatically connect to a remote modem using any supported modulation
scheme.
If disabled, the modem only supports the modulation scheme selected by the S41 register (Dial-Line Rate).
If the modem is in a modem pool attached to a System 85 PBX, S78 should be set to 2. This modifies parameters used
during connection to the PBX.
Register has the following values:
0 = Enable
1 = Disable
2 = System 85
Factory setting is Enable.
S80 – No Data Disconnect Trigger Signal
Register determines whether Pin 2 (transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is
monitored so that the modem can disconnect the call if there is no activity for a certain period. (See the \T command.)
Register has the following values:
0 = Transmit or Receive
1 = Transmit only
2 = Receive only
3 = Transmit and Receive
Factory setting is 3.
S82 – Autorate (Leased Line)
Determines if the Autorate function is used on leased lines when connected in V.32bis, V.32
terbo , or V.34 mode. Autorate
allows the modem to adjust line speed due to varying VF line quality.
Register has the following values:
0 = Enable
1 = Disable
Factory setting is Enable.