Overview
Reliability
22 Overview for S8700 Media Server
November 2003
Critical Reliability when sending voice bearer
over CSS or ATM
The critical-reliability configuration option is similar to the high-reliability configuration option. In
addition, the critical-reliability configuration duplicates the bearer network channels among the PNs.
Like the high-reliability configuration, the critical-reliability configuration consists of the following:
• Two S8700 Media Servers
• Two Ethernet switches
5 Duplication Links: The Ethernet link, default Ethernet 2, and the fiber link.
6 Services interface: default Ethernet 1-The server’s dedicated Ethernet
connection from the S8700 Media Server to a Services laptop. This link is
active only during onsite 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 when possible. Control network A is considered the
primary control network because it connects to the primary IPSI board in a PN.
8 Network control B interface: default Ethernet 3-The S8700 Media Server’s
Ethernet connection to a duplicated set of Ethernet switches.
This private LAN carries control signals for the PNs when the primary control
network is unavailable.
Control network B connects to the secondary IPSI board in a PN. When the
problem is resolved, primary control is returned to control network A.
9 Ethernet switch — At least one is required to support each control network.
10 UPS — Keeps the S8700 Media Servers and Ethernet switches functional
during brief power outages. Usually, UPS one powers server one and the
Ethernet switch associated with it. UPS two powers server two and the Ethernet
switch associated with it.
11 PN — Provides the telecommunications functions of the S8700 Media Server.
For high reliability, each IPSI-connected PN contains a pair of IPSI circuit
packs. This pair consists of, one primary circuit pack, and a duplicate
secondary circuit pack as a backup.
For critical reliability, the bearer network, among the port networks is also
duplicated. Two EI circuit packs or two ATM circuit packs are present in each
PN instead of just one.
12 IPSI — The IPSI circuit pack is duplicated in every IPSI-connected PN in a
high- or critical-reliability configuration.
The secondary IPSI is connected to control network B. The secondary IPSI
takes over in case of problems with the primary control network. The S8700
Media Server regularly tests the duplicated IPSI to make sure it is ready for
service.
13 Bearer Connectivity
Figure notes
Number Description of Connection
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