Avaya ESS User Manual

ESS failover examples
Issue 1.1 June 2005 29
Because the IPSIs in Port Networks 1 through 4 cannot communicate with the Main server or
the S8700 ESS server, they adjust their priority list and move the S8500 ESS server to the top
of the list. The no service timer activates for Port Networks 1 through 4. When the no service
timer expires, the IPSIs in Port Networks 1 through 4 request service from the S8500 ESS
server. The S8500 ESS server acknowledges the request and assumes control of Port Network
1 through 4 (see Figure 5
). Note that Port Networks 5 through 8 did not experience any service
outage from the failure.
Figure 5: Network failure - ESS recovery
UID
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2
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COMPACT
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COMPACT
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S8710 Media Server
(Main Server)
cycmerf2 KLC 031505
disc
S8500 ESS Server
(2nd Alternative)
PN #1 PN #5
PN #2 PN #6PN #3 PN #7
PN #4 PN #8
S8700 ESS Server
(1st Alternative)
Out of Service
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk

Avaya ESS Specifications

General

Brand	Avaya
Model	ESS
Category	Server
Language	English