Avaya ESS User Manual

ESS failover examples
Issue 1.1 June 2005 51
In order for an ESS server to control a PN without an IPSI, such as PN5, the ESS server must
first control a PN with an IPSI. Once the ESS server controls a Port Network with an IPSI the
ESS server may then attempt to communicate with and possibly control a non-IPSI PN through
the ATM network. The S8500 ESS server cannot communicate with the ATM switch and
therefore cannot take control of Port Network 5 through the ATM connection (EI board).
Figure 19: ATM - Single ESS sever second takeover scenario
UID
2
1
0
1
1
0
3
2
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2
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COMPACT
5
4
5
4
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p
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UID
2
1
0
1
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0
3
2
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2
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COMPACT
5
4
5
4
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p
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1
S8710 Media Server
(Main Server)
PN #1 PN #6
PN #2 PN #5
PN #3 PN #4
cycmatm5 KLC 031505
disc
S8500 ESS Server
(1st Alternative)
ATM
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