Avaya 03-300430 User Manual

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

PN 1

IPSI

PN 2

Server A

Server B

Control Network A

Control Network B

Bearer Network A

Bearer Network B

T/C

PN 3