User manual

42 System architecture
The Dual Ring fiber-optic cable configuration provides complete
non-blocking communication between the Network groups; this eliminates
the incidence of busy signals for calls switched between groups. Each FIJI
card can handle 32 PCM links. A system of eight Network groups provides
8000 timeslots for 4000 simultaneous conversations.
This Dual Ring network is fully redundant: each of the fiber-optic cable
rings is capable of handling the traffic for an entire eight group network. If
a fault in one ring is detected, the other ring automatically takes over call
processing. No calls are lost during the switchover.
The Dual Ring Fiber network operated under four states:
•
Normal
— Traffic is shared between the two r ings.
— Each FIJI card drives 480 timeslots.
•
Full
— Traffic is handled by a single ring.
— Each FIJI card drives 960 timeslots
•
Survival
— FIJI cards in both rings are used to maintain intergroup traffic.
•
Disabled
— The ring is inactive and does not support call processing.
Superloop network configurations
By combining four network loops, the superloop network card makes 120
timeslots available to IPE cards. Compared to regular network loops, the
increased bandwidth and a larger pool of timeslots increases network traffic
capacity for each 120-timeslot bundle by 25 percent (at a P0.1 grade of
service).
The NT8D37 IPE module is divided into segments numbered 0–3 of four
card slots each (see Figure 15 "Superloop segments in the IPE module"
(page 43)). Segment 0 consists of slots 0–3, segment 1 consists of slots
4–7, segment 2 consists of slots 8–11, and segment 3 consists of slots
12–15.
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
NN43021-110 01.03 Standard
Release 5.0 18 Februar y 2008
Copyright © 2003-2008, Nortel Networks
.