Demand test descriptions and error codes - Avaya Support

Critical Reliability
TONE-BD (Tone-Clock Circuit Pack)
S8700-series Fiber-PNC: The critical-reliability configuration shown in Figure 91 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 91: Critical-Reliability Configuration
IPSI IPSI
PN 1
EI EI
Tone-Clock Interchange Strategy
Server A Server B
Control Network A Control Network B
IPSI IPSI
PN 2
EI EI
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
T/C T/C
PN 3
EI EI
Bearer Network A Bearer Network B
Issue 5 May 2009 993