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
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COMPACT
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COMPACT
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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
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