Filter
Top Products
TONE-BD (Tone-Clock Circuit)
Issue 1 June 2005 2333
Critical Reliability
S8700 MC: The critical-reliability configuration shown in Figure 142 has full duplication of the
following options: servers, control networks, IPSIs and PNCs (bearer networks). As with the
high-reliability configuration, this configuration also requires that IPSI connected port networks
have duplicated IPSIs. This configuration also requires that the non IPSI connected port
networks have duplicated Tone-Clock boards (either TN2182 or TN780).
Figure 142: Critical-Reliability Configuration
Tone-Clock Interchange Strategy
There are three types of Tone-Clock interchanges:
● Autonomous interchanges initiated as a part of maintenance software strategy for the
Tone-Clock or IPSI circuit packs.
● Manual interchanges initiated by set tone-clock or set ipserver-interface.
● Firmware-initiated Tone-Clock interchanges
IPSI IPSI
EI EI
PN 1
IPSI IPSI
EI EI
PN 2
Server A Server B
Control Network A Control Network B
Bearer Network A Bearer Network B
T/C T/C
EI EI
PN 3