Avaya ESS User Manual page 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
PN #1
PN #2
S8710 Media Server
(Main Server)
disc COMPACT
1
2
UID
disc COMPACT
1
2
UID
PN #3
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk
S8500 ESS Server
(1st Alternative)
disc
PN #4
ATM
ESS failover examples
PN #6
PN #5
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Out of Service
cycmatm5 KLC 031505
Issue 1.1 June 2005 51