Avaya ESS User Manual

ESS failover examples
Issue 1.1 June 2005 53
Figure 20: ATM, single ESS server, multiple nodes in normal operation
A network outage occurs that fragments the two ATM and IP networks (see Figure 21). The
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.
ATM ATM
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
u
p
l
e
x
ch
ch
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
u
p
l
e
x
ch
ch
2
1
S8710 Media Server
(Main Server)
PN #1
PN #2
PN #3
PN #6
PN #5
PN #4
S8700 ESS Server
(1st Alternative)
cycmatm3 KLC 031505
PN #2 does not
have an IPSI
PN #5 does not
have an IPSI
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