EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 May 2002
8-769555-233-143
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:
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 (SPE) 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 (TN790-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:
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:
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.
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