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COMSPHERE 3900 Series Modems
5-14 September 1998 3910-A2-GN32-40
Table 5-1
(5 of 10)
DTE Interface Configuration Options
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.
H 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.
H Ignore
Modem assumes RTS is always ON. Use this selection when the DTE does not provide RTS to
the modem.
H 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.
H 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 if 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 it 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.
H Disable
The antistreaming function is not in effect.
H 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.