Avaya S8700 Maintenance Manual page 2383

TONE-BD (Tone-Clock Circuit)
Figure 8-98. Duplex-Reliability Configuration
High-Reliability Configuration
The high-reliability configuration shown in
duplicated control network, and duplicated IPSIs in the IPSI-connected port
networks. With this configuration, every IPSI-connected EPN must have
duplicated IPSIs. The control network is duplicated so that a single fault in the
control network, such as a bad Ethernet switch, won't bring the whole system
down. The non-IPSI-connected port networks have unduplicated Tone-Clock
boards. Each EPN's Tone-Clock circuit is active for both tones and clock signals
for its port network.
555-233-143
Server A
Control Network A
IPSI IPSI
EPN 1 EPN 2
EI EI
Bearer Network
Server B
T/C
EPN 3
EI
Figure 8-99 has a duplicated server, a
Issue 1 May 2002 8-1661