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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Managing data calls
412Administered Connection
15
Administered Connections failure: Auto
Restoration and Fast Retry
When an active AC drops prematurely, you must invoke either auto restoration or
fast retry to determine whether auto restoration is attempted for an active AC.
If you option AC for auto restoration and the connection was routed over SDDN
trunks, auto restoration is attempted. During restoration, connections are
maintained between the switch and both endpoints. In addition to allowing the
active session to be maintained, AC also provides a high level of security by
prohibiting other connections from intervening in active sessions. Auto restoration
generally completes before the 60-second endpoint holdover interval. If auto
restoration is successful, the call might be maintained (no guarantee). The
restoration is transparent to the user with the exception of a temporary disruption
of service while restoration is in progress. A successful restoration is reflected by
the restored state on the status AC screen. Although the restoration was
successful, the data session may not have been preserved.
If auto restoration is not active or if the AC is not routed over SDDN trunks, the
switch immediately attempts to reestablish the connection (fast retry). The switch
also attempts a retry if the originating endpoint initiated the drop. With fast retry,
connections are not maintained on both ends. Fast Retry is not attempted for an
AC that was last established via fast retry, unless the AC is active for at least two
minutes.
If auto restoration or fast retry fails to restore or reestablish the connection, the
call drops and the AC goes into retry mode. Retry attempts continue, at the
administered retry interval, as long as the AC is due to be active.
Administering Administered Connections
1. Choose one of the following data modules and administer all fields:
■ Data Line Data Module (use with Data Line circuit pack)
■ Processor/Trunk Data Module (use with one of the following:)
— MPDMs, 700D, 7400B, 7400D, or 8400B
MTDMs, 700B, 700C, 700E, or 7400A
■ Processor Interface Data Module (refer to DEFINITY ECS
Administration for Network Connectivityfor more information)
■ X.25 Data Module (refer to DEFINITY ECS Administration for
Network Connectivity for more information)
■ 7500 Data Module (use with ISDN Line 12-BRI-S-NT or ISDN
Line 12-BRI-U-NT circuit pack)
■ World Class Core BRI Data Module (use with wcbri)