TONE-BD (Tone-Clock Circuit)
Issue 1 May 2002
8-1661555-233-143
Figure 8-98. Duplex-Reliability Configuration
High-Reliability Configuration
The high-reliability configuration shown in Figure 8-99 has a duplicated server, a
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.
EI
EPN 3
Server A Server B
IPSI
EI
EPN 2
IPSI
EI
EPN 1
Control Network A
Bearer Network
T/C
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