ESS Overview
50 Avaya Enterprise Survivable Servers (ESS) Users Guide
Figure 18: ATM - single ESS server first takeover scenario
In the second takeover example (see Figure 19), the customer experiences a network failure.
Communication between the Main server and Port Networks 1 through 3 has not been affected
by the outage. The IPSIs in Port Network 4 and Port Network 5 can no longer communicate with
the Main server. The no service timer activates. When the no service timer expires the IPSIs in
Port Networks 4 and 5 request service from the S8500 ESS server.
UID
2
1
0
1
1
0
3
2
3
2
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COMPACT
5
4
5
4
S
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p
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D
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x
ch
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2
1
UID
2
1
0
1
1
0
3
2
3
2
disc
COMPACT
5
4
5
4
S
i
m
p
l
e
x
D
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p
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ch
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2
1
S8710 Media Server
(Main Server)
PN #1 PN #6
PN #2 PN #5
PN #3 PN #4
cycmatm2 KLC 031605
disc
S8500 ESS Server
(1st Alternative)
ATM
PN #2 does not have
an IPSI but remains in
service via PN #3
PN #5 does not have
an IPSI but remains in
service via PN #4
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
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