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Avaya Application Solutions platforms
96 Avaya Application Solutions IP Telephony Deployment Guide
 
Critical reliability configuration 
The critical reliability configuration option is built upon the high reliability configuration. In the 
critical reliability configuration, the bearer network has duplicated components so that there is 
no single point of failure. The critical 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
Two CSS/ATM EI (Expansion Interface) in every port network
S8700-series fiber-PNC survivability
In addition to the high reliability of the duplicated S8700-series Servers, the S8300 or S8500 
Server in a Local Survivable Processor (LSP) configuration can be used to provide survivability 
for H.248 branch gateways and IP phones. Additional recovery capability is embedded in the 
Communication Manager that resides on the S8700-series Server.
The S8500 and S8700-series Servers provide survivability for remote G650 Media Gateways 
and port networks with IPSI.
Avaya S8700-series Server IP-PNC configuration
The S8700 IP-PNC configuration is an all-IP solution that is built on open IP network 
connection. This solution is designed for medium to large enterprises. The main difference 
between the IP-PNC and fiber-PNC configurations is that IP-PNC uses the IP network for all 
inter-port network communication whereas fiber-PNC uses optic-fiber connections between the 
PNs in a CSS or ATM network.
The IP-PNC platform is scalable to 64 Port Networks, each of which can house up to five G650s 
and up to 250 G700, G450, G350, G250, or G150 Media Gateways. The server complex still 
consists of duplicated S8700-series Servers. One server is active, and the other server is on 
standby. See 
on page 34 for information on the S8700-series Server 
performance and capacities.
page 97 shows an example of an S8700 with remote G700 Media Gateways.