Overview
Reliability
20 Overview for S8700 Media Server
November 2003
High Reliability when sending voice bearer
over CSS or ATM
The high-reliability configuration option builds on the duplex-reliability option. The high-reliability
duplicates components so that no single point of failure exists in the control network. The high-reliability
configuration consists of the following:
• Two S8700 Media Servers
• Two Ethernet switches
• Two UPS units
• Two IPSI circuit packs in each IPSI-connected port network
Voice and data bearer traffic between port networks is carried on a simplex network that is made up of
one Expansion Interface (EI) in each port network. Avaya offers different types of EI circuit packs, one
for CSS, one for ATM. The EIs are cabled with lightguide fiber to either the Center Stage Switch (CSS)
or an Asynchronous Transfer Mode (ATM) switch.
See Figure 8, High- or critical-reliability configuration when sending voice bearer over CSS or ATM,
on
page 21 for an example of a high-reliability configuration when sending voice bearer over CSS or ATM.
6 Services interface: default Ethernet 1-The server’s dedicated Ethernet connection from
the S8700 Media Server to a laptop. This link is active only during on-site
administration or onsite maintenance.
7 Network control A interface: default Ethernet 0-The server’s Ethernet connection to
one or two Ethernet switches. This private LAN carries the control signals for the PNs.
8 Ethernet switch — at least one Ethernet switch is required to support the S8700 Media
Server’s control network. If many PNs are present, two Ethernet switches may be
daisy-chained together to provide sufficient Ethernet connections to the IPSI boards in
the PNs.
9 UPS — Keeps the S8700 Media Servers and Ethernet switches functional during brief
power outages.
10 PN — Provides the telecommunications functions of the S8700 Media Server.
11 IPSI — The IPSI circuit pack carries the control network signals to the PNs and
provides tone clock functionality.
12 Bearer connectivity
Figure notes
Number Description of the Connection
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