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Communication Manager Maintenance-Object Repair Procedures
1182 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
Survivable Remote EPN
The Survivable Remote EPN (SREPN) feature allows a S8700 Multi-Connect EPN (either MCC
or SCC) to provide service to the customer when:
● Its fiber (or T1/E1 EI link to the S8700 Multi-Connect processor) fails or is severed
● The S8700 Multi-Connect processor or center stage fails.
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 S8700 Multi-Connect is down and switches to a link from the local SRPPN
(TN790B-based processor). When the links to the S8700 Multi-Connect are restored and
verified to be stable, the logic switch is manually reset, and the EPN is reconnected to the links
from the S8700 Multi-Connect.
Note:
Note: The 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.
Note:
Note: If you suspect a problem with the TN790B-based R6si SRPPN use the R6si
maintenance documentation supplied with the SREPN feature to resolve any
alarms/errors associated with the SRPPN carrier.
SREPN Feature Active
!
WARNING:
WARNING: Every call within the SREPN is terminated when the SREPN feature is activated,
and the R6si 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 a S8700 Multi-Connect EPN. The TN775C Maintenance circuit pack notifies the
co-located SRPPN of the problem, and the TN2301 SRSwitch circuit pack in the SRPPN carrier
switches the EI LAPD link connection from the S8700 Multi-Connect Port Network to its
counterpart in the S8300 Media Server with G700 Media Gateway SRPPN. The SREPN is now
in the Survivable Remote mode and has the capabilities of an S8300 Media Server with G700
Media Gateway EPN that has been pre-translated with a Disaster Recovery configuration.
Note:
Note: When SREPN feature is active, the EI circuit pack that is assigned to the SREPN
and located in the S8700 Multi-Connect PN is put in loop-back mode.