Avaya ESS User Manual page 40

ESS Overview
There is a catastrophic failure that occurs on the S8710 Main server (see
Networks can no longer communicate with the Main server. The IPSIs in Port Networks 1, 3, 4,
and 5, request service from the S8500 ESS server after the no service timer expires. ESS does
not utilize CSS, therefore Port Network 2 and the CCS located in Port Network 3 is
out-of-service.
Figure 12: CSS after failover with single ESS server
PN #1
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk
cycmcss2 KLC 031505
40 Avaya Enterprise Survivable Servers (ESS) Users Guide
S8710 Media Server
(Main Server)
disc COMPACT
disc
COMPACT
PN #2
CSS
PN #3
1
2
UID
S8500 ESS Server
(1st Alternative)
1
2
UID
disc
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Out of Service
Figure 12). The Port
PN #5
PN #4
LAN (IP PNC)
IP Media Processors
assume PNC