Digicom 3911, 3910 operation manual Leased Line Configuration Options

COMSPHERE 3900 Series Modems

Table 5-5

(4 of 6)

Leased Line Configuration Options

AutoDialStandby: Disable

Nxt Disable 15min 1hr 4hr Test(2min) Adv 15min Adv 30min Adv 1 hr TestAdv2min

This configuration option is not available if the LeaseLine Rate is configured for TMp and the NetworkPosition is configured for Control.

Automatic Dial Standby. Permits a modem operating on dial lines (regardless of the method of dialing origination) to check the quality of the leased lines periodically and, if they are good, to disconnect from the dial lines and resume operations on the leased lines. The time interval that the modem uses to check the quality of the leased lines is determined by the configuration option. These intervals are 15 minutes, 1 hour, and 4 hours. The Test(2min) and TestAdv2min selections are for testing purposes only. The Adv 15min, Adv 30min, and Adv 1 hr selections cause the modem to evaluate the leased lines continuously in a manner which is non-disruptive to the dial-line communication.

The AT command is S-Register S47=n, where n is 0 for Disable, 1 for 15min, 2 for 1hr, 3 for 4hrs, 4 for Test(2min), 5 for Adv 15min, 6 for Adv 30min, 7 for Adv 1 hr, and 8 for TestAdv2min.

SpecialStandby: Disable

Nxt Disable Enable

This configuration option is only available if Automatic Dial Standby is configured for 15min, 1hr, 4hr or Test(2min) and Leased mode is configured for Originate mode,

or

if Automatic Dial Standby is configured for Adv15min, Adv30min, Adv1hr or TestAdv(2min).

Special Standby. Used to support Automatic Dial Standby configurations when a third modem is used for the dial backup. When the leased line is restored, the Special Standby configuration allows the leased-line modems to return service to the original point-to-point modems.

NOTE: When the modems are set for normal dial standby (15min, 1hr 4hr, or Test(2min)), the Special Standby configuration option allows the originate modem to test the lease connection in one direction before interrupting primary data on the dial lines.

NOTE: When the modems are set for advanced dial standby (Adv15min, Adv 30min, Adv1hr or Adv Test(2min)), the Special Standby configuration option allows a non-interruptive algorithm to test the original point-to-point lease connection in both directions before interrupting primary data on the dial lines.

The AT command is S-Register S98=n, where n is 0 for Disable and 1 for Enable.

Dial StandbyTime: 10min

Nxt 10min 5min 1min

Dial Standby Time. Selects the amount of time that a dial circuit is held after returning to the leased lines.

CarrierOn Level: –43dbm

Nxt –43dbm –26dbm –33dbm

Carrier On Level. Controls the carrier detection threshold for leased lines. When the power level of the receive carrier signal drops 2 dBm below this level (–26 dBm, –33 dBm, or –43 dBm), LSD turns OFF. When the carrier signal is greater than this level, LSD turns ON.

For TMp Control, –26dbm is the factory default.

The AT command is S-Register S48=n, where n is 0 for –43 dBm, 1 for –26 dBm, and 2 for –33 dBm.

5-36 September 1998 3910-A2-GN32-40