COMSPHERE 392xPlus Modems
4-36 November 1996 3920-A2-GN31-30
Table 4-7
(4 of 8)
DTE Interface Configuration Options — Singleport Mode A
DSR Control: Stndrd_RS232 (Cont.)
The AT command for Forced On is &S0.
The AT command for Standard RS232 is &S1.
The AT command for Wink When Disconnect is &S2.
The AT command for Follows DTR is &S3.
The AT command for On Early is &S4.
The AT command for Delay to Data is &S5.
RTS Action: Stndrd_RS232
Nxt Stndrd_RS232 Ignore Sim_Cntl_Car Cntl_Car
Request-to-Send Action. RTS is a signal from the DTE indicating the DTE has data to send.
Standard RS232 – Allows the DTE to control RTS to the modem in normal EIA-232-D operation. RTS must be ON for
the DTE to transmit to the modem.
Ignore – Modem assumes RTS is always ON. Use this selection when the DTE does not provide RTS to the modem.
Simulated Control Carrier – RTS input controls the remote modem’s LSD signal. This is used for DTEs that require
Line Signal Detect (LSD) to toggle ON and OFF to simulate half-duplex operation. If RTS Action is set to simulated
control carrier
, then the remote modem’
s LSD Control configuration option must be set to Simulated Control Carrier.
Simulated Control Carrier conforms to V.13 specifications. This setting is ignored when the modem is configured for
Asynchronous mode and RTS/CTS flow control is selected.
Control Carrier – Allows the DTE’s RTS signal to control the modem’s carrier signal. When RTS is ON, carrier is
present on the VF line. When RTS turns OFF, carrier is not present. This is only valid for V.29 and V.27bis leased-line
modulations. Auto Dial Backup is always disabled for this setting.
The AT command for Standard RS232 is &R0.
The AT command for Ignore is &R1.
The AT command for Simulated Control Carrier is &R2.
The AT command for Control Carrier is &R3.
RTS Antistream: 10sec
Nxt 10sec Disable 30sec 1min 2min 3min 5min
This configuration option only appears in TMp Tributary mode, or when RTS_Action is configured for Cntl_Car
(V.29 and V.27bis).
Request-to-Send Antistreaming. If enabled, the operation of the antistreaming function is as follows. If RTS is ON for a
period exceeding the selected time, the modem will take over control of the carrier and will force the carrier OFF. The
modem will also force CTS OFF during this time. This condition will stay in effect until the DTE turns RTS OFF. After
this, the next time the DTE turns RTS ON, carrier will be turned ON and the RTS timer will start again.
Disable – The antistreaming function is not in effect.
10 sec, 30 sec, 1 min, 2 min, 3 min, 5 min – Enables the antistreaming function and sets the maximum ON time for
RTS before antistreaming control takes effect.
The AT command is S-Register S72=
n
, where
n
is 0 for Disable, 1 for 10 sec, 2 for 30 sec, 3 for 1 min, 4 for 2 min,
5 for 3 min, and 6 for 5 min.