Avaya S8700 Maintenance Manual page 61

Duplication for Reliability
#
Description of Components and Connections in
1 Administration PC — used to access S8700 Media Server over the corporate LAN
2 Corporate LAN
3 Corporate LAN interface: default Ethernet 4 — S8700 Media Server's Ethernet link to the LAN.
Used for administration and can be used for alarming via simple network message protocol
(SNMP) traps to the Initialization and Administration System (INADS).
4 S8700 Media Server — two are always present, one in active mode and the other on standby.
5 Duplication interface: default Ethernet 2. The dedicated Ethernet connection between the
S8700 Media Servers.
6 Services interface: default Ethernet 1. The server's dedicated Ethernet connection to a laptop.
This link is active only during on-site administration or maintenance.
7 Network control A interface: default Ethernet 0. The server's Ethernet connection to 1 or 2
Ethernet switches. This private LAN carries the control signals for the S8700 Multi-Connect
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 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 system 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 through brief power
outages. Usually, UPS 1 powers server 1 and its Ethernet switch and UPS 2 powers server 2
and its Ethernet switch.
11 PN — provides telecommunications functions of the S8700 Multi-Connect Media Server.
For High Reliability, each IPSI-connected PN contains a pair of IPSI circuit packs, 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. This
means that two EI circuit packs or two ATM circuit packs are present in each PN instead of
just one.
12 IPSI — IPSI circuit pack is duplicated in every IPSI-connected PN in a high reliability or critical
reliability configuration.
The primary IPSI is connected to control network A. It is the preferred IPSI because it has
better control over activating the clock than the secondary IPSI.
The secondary IPSI is connected to control network B. This 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, before returning control to the primary
IPSI.
13 Bearer Connectivity
555-233-143
Figure 2-3 on page 2-10
Issue 1 May 2002 2-11