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94 Avaya Application Solutions IP Telephony Deployment Guide
High reliability configuration
The high reliability configuration option builds on the standard reliability option. The high
reliability option duplicates components, so that no single point of failure exists in the control
network. The high reliability configuration consists of the following components:
● Two S8700-series Servers
● Two IPSI circuit packs in each IPSI-connected port network
● Two Ethernet switches
● Two UPS units
Circuit-switched traffic between port networks is carried on a simplex network that is made up of
one Expansion Interface (EI) in each port network. The EIs are cabled with lightguide fiber to
either the Center Stage Switch (CSS) or an Asynchronous Transfer Mode (ATM) switch.
Figure 29:
S8700-series fiber-PNC in a high reliability configuration on page 95 shows an
example of a high reliability configuration.