Avaya ESS User Manual page 39

Figure 11: Normal operation CSS with single ESS server
PN #1
PN #2
PN #2 does not
have an IPSI
Recommended for survivability:
- IPSI in every PN
- IP Media Processor in every PN
S8710 Media Server
(Main Server)
disc COMPACT
1
2
UID
disc COMPACT
1
2
UID
PN #3 CSS
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk
S8500 ESS Server
(1st Alternative)
disc
ESS failover examples
PN #5
PN #4
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Out of Service
cycmcss1 KLC 031505
Issue 1.1 June 2005 39