User`s guide

COMSPHERE 3800Plus Modems

8-12 October 1998 3980-A2-GB30-40

Table 8-1

(6 of 7)

DTE Interface Configuration Options

RTS/CTS Delay: 0 msec

Nxt 0msec 10msec 50msec 150msec 600msec

Request-to-Send/Clear-to-Send Delay. RTS/CTS Delay sets the delay time between the modem receiving RTS from the

DTE and the modem sending CTS to the DTE.

This delay is only valid in Async Direct mode and synchronous applications when it is necessary to have a short delay

between the time the DTE raises RTS and the time the modem presents CTS to allow the DTE to send data.

NOTE: For this configuration option to be valid, both the RTS Action and the CTS Control configuration options must be

set for Stndrd RS232. If RTS Action is set for Ignore, RTS is always ON and this configuration option has no

effect.

The factory default is 0 milliseconds.

AT command equivalent is S-register S26=

LSD Control: Stndrd_RS232

Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Sim_Cntl_Car =DTR/DiscOff BridgeRetrain

Line Signal Detect Control. LSD is a signal indicating that the carrier signal is being received from the remote modem. It

is normally turned Off to the DTE when the power level of the received carrier signal drops below the carrier detect

threshold.

Standard RS232 – LSD is ON when the modem detects the remote modem’s carrier signal. LSD turns Off when the

carrier signal strength drops below carrier detect threshold.

Forced On – Forces LSD to be ON at all times.

Wink When Disconnect – LSD is normally forced ON, but can be turned Off for 1 to 2 seconds upon a disconnect. This

is used for UNIX DTEs.

Follows DTR – The state of LSD follows the state of DTR. When DTR turns ON, LSD turns ON. When DTR turns Off,

LSD turns Off.

Simulated Control Carrier – LSD follows the state of RTS of the remote DTE via the V.13 simulated control carrier

signaling. This is required for hosts that cannot support full-duplex operation. Valid only in Synchronous mode and

Asynchronous Direct mode.

NOTE: If LSD Control is set for simulated control carrier, then the RTS Action configuration option on the remote

modem must be set for Simulated Control Carrier.

=DTR/Disconnect Off – The state of LSD follows the state of DTR except when disconnecting once a connection is

established. In this instance, DTR remains ON and LSD turns Off. DTR must then toggle Off and then ON again for LSD

to turn ON. This setting is required for AT&T DATAKIT dial-out applications.

BridgeRetrain – LSD behaves as if it were set for Standard RS232, except that it is turned off when a retrain condition

lasts longer than 10 seconds, and turned on again when no retrain condition is detected for a period of 10 seconds.

NOTE: If LSD Control is set for =DTR/DiscOff, then the DTR Action configuration option must be set for Stndrd_RS232.

For Async Dial, Sync Dial, and Sync Leased, Stndrd_RS232 is the factory default.

For UNIX Dial, WinkWhenDisc is the factory default.

AT command equivalent is &C