Avaya ESS User Manual page 53

Figure 20: ATM, single ESS server, multiple nodes in normal operation
PN #1
PN #2
PN #2 does not
have an IPSI
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk
cycmatm3 KLC 031505
A network outage occurs that fragments the two ATM and IP networks (see
Main server continues to provide service to Port Networks 1 through 3 with no service
interruption. The IPSIs in Port Network 4 and 6 requests service of the S8700 ESS server after
the no service timer expires. The S8700 ESS server assumes control of Port Network 4 first.
S8710 Media Server
(Main Server)
disc COMPACT
1
2
UID
disc COMPACT
1
2
UID
PN #3
ATM
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Out of Service
S8700 ESS Server
(1st Alternative)
PN #4
ATM
Issue 1.1 June 2005
ESS failover examples
PN #6
PN #5
PN #5 does not
have an IPSI
Figure 21). The
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