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TONE-BD (Tone-Clock Circuit)
Issue 1 June 2005 2331
Figure 140: Duplex-Reliability Configuration
Standard Reliability
Systems with the standard-reliability option (no duplication options) have one Tone-Clock circuit
pack in each port network. For the first Port Network of a cabinet this is in the A carrier. Cabinets
containing a second EPN will also have a Tone-Clock circuit pack in the E carrier. This
Tone-Clock circuit pack generates clocks and provides system tones for every carrier of the port
network it resides in.
High Reliability
S8700 MC: The high-reliability configuration shown in Figure 141 has a duplicated server, a
duplicated control network, and duplicated IPSIs in the IPSI connected port networks. With this
configuration, every IPSI connected PN 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.
An EPN’s Tone-Clock circuit pack configuration is the same as for the standard-reliability option.
Each PN’s Tone-Clock circuit is active for both tones and clock signals for its port network.
EI
PN 3
Server A Server B
IPSI
EI
PN 2
IPSI
EI
PN 1
Control Network A
Bearer Network
T/C