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COMSPHERE 3900 Series Modems
4-36 November 1996 3910-A2-GN32-30
Table 4-5
(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
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 (either –26 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 and 1 for –26 dBm.
V27bis Train: Short
Nxt Short Long
This configuration option is only available if Leased-Line Rate is configured for V27bis.