Demand test descriptions and error codes - Avaya Support

Survivable Remote EPN
Note:
Note: This feature is viewed as a “disaster recovery operation” capability rather than as
an additional reliability option.
The SREPN allows a remote EPN cabinet to provide processor capabilities to the EPN in the
event of a failure. A logic switch circuit pack (TN2301) located in the SRPPN detects when the
link to the server is down and switches to a link from the local SRPPN (TN790B-based
processor). When the links to the server are restored and verified to be stable, the logic switch
is manually reset, and the EPN is reconnected to the links from the server.
Note: The
Note:
SREPN feature is not available when an ATM-PNC/EI circuit pack is used to
replace the TN570 EI circuit pack in a direct-connect configuration, or an ATM
Switch is providing the Center Stage (PNC) connectivity.
SREPN Feature Active
WARNING: Every call within the SREPN is terminated when the SREPN feature is activated,
and the SRPPN takes control of the SREPN.
The SREPN feature is activated when the Maintenance circuit pack (TN775C or later and
located in the SREPN) detects a problem with the SREPN’s EI (TN570B) LAPD link to its
counterpart in an EPN. The TN775C Maintenance circuit pack notifies the co-located SRPPN of
the problem, and the TN2301 / circuit pack in the SRPPN carrier switches the EI LAPD link
connection from the Port Network to its counterpart in the SRPPN. The SREPN is now in the
Survivable Remote mode and has the capabilities of an EPN that has been pre-translated with a
Disaster Recovery configuration.
Note: When
Note:
the SREPN feature is active, the EI circuit pack that is assigned to the
SREPN and located in the PN is put in loopback mode.
Restoring Normal Service to the SREPN
WARNING: Every call within the SREPN is terminated when the SREPN feature is returned to
normal service.
To restore normal connections to the SREPN EI circuit pack in the PN, you must:
1. Clear every error logged against the SREPN EI circuit pack by using the suggested repair
procedures outlined in this MO.
2. At the SRP flip the 3-position switch on the TN2301 to the RSTR (restore) or top position
for at least 1 second and return the switch to the AUTO, or middle position.
432 Maintenance Alarms for Communication Manager, Media Gateways and Servers