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DEFINITY Enterprise Communication Server Release 9
Installation and Maintenance for Survivable Remote EPN 555-233-121
2
SREPN Maintenance
SREPN connections
Transfer sequence to Survive mode
Transfer from Normal to Survive mode is automatic and is controlled by the
TN775C Maintenance board.
within the TN2301 circuit pack.
Figure Notes:
1. Release 9r
2. Survivable Remote EPN (SREPN)
Figure 2-3. TN2301 link switching schematic
The transfer sequence to Survive mode is:
1. Links from the Release 9r PPN to one of its configured SREPNs fail.
2. The TN775C Maintenance circuit pack (A-carrier SREPN) detects the link
failure and signals the TN2301 to disconnect its links to the Release 9r and
connect the SREPN Expansion Interface.
3. The TN2404 Survivable Remote processor (SRP) takes over control of the
EPN in Survive mode on Link A. Link B is left open while the SRP is in
control of the SREPN.
NOTE:
In Survive mode, the SRSwitch (TN2301) puts the EI/SNI circuit pack in the
Release 9r into loopback mode.
Figure 2-3
1
A
B
shows a schematic of the link switching
3
TN2301
A
B
4
3. SRSwitch (TN2301)
4. Survivable Remote processor (R9si)
Issue 2
November 2000
2-6
B
2
A
cydfsrp2 KLC 022499
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