Avaya S8700 Maintenance Manual page 62

Hardware Configurations
Critical-Reliability Configuration
Critical-reliability systems include all of the features and components of the
high-reliability configuration described above, but it also has a duplicated bearer
network. This configuration requires that not only the IPSI-connected port
networks have duplicated IPSIs, but also the non-IPSI-connected port networks
must have duplicated Tone-Clock boards. Also duplicated in this configuration are
the expansion interface (TN570) and the switch node interface (TN573).
2-12 Issue 1 May 2002 555-233-143