Card Combinations - Nortel 1000 Description, Installation And Operation Manual

Card combinations

The Leader and DCHIP, or Follower and DCHIP, functions can reside on a
single IP trunk card or multiple IP trunk cards. If a Follower card is equipped
with a DCH PC card, it can function as a DCHIP trunk card. As an IP Trunk
3.01 (and later) node becomes larger with more trunk traffic, load balancing
should be configured. When load balancing is required, the Leader and
DCHIP functionality are placed on separate cards which are assigned the least
call traffic. For the largest IP Trunk 3.01 (and later) nodes and networks, the
Leader and DCHIP cards can be partially configured with trunk ports or have
no trunk ports at all.
An example configuration that allows for redundancy and backup is the
following:
• Card 1: Leader and DCHIP #1
• Card 2: Backup Leader and DCHIP #2
• Card 3: Follower #1 – 24 trunks connected with DCHIP #1
• Card 4: Follower #2 – 24 trunks connected with DCHIP #2
To support more trunks, more DCHs can be added. Each DCHIP card can
support a maximum of 15 NT0961AA ITG-Pentium 24-Port Follower cards
or 11 NTVQ90BA Media Card 32-port Follower cards. This limit is due to
the maximum limit of 382 trunks in an ISL route.
Note: Each DCHIP card controls a separate group of Follower cards. If
a DCHIP card fails, its associated Followers are removed from service as
well. For very large nodes, it is recommended that Follower cards be
spread across multiple DCHIPs, in order to provide some resiliency by
allowing the IP Trunk 3.01 (and later) node to continue handling calls
when one DCHIP card fails.
A DCHIP card and all of the IP trunk cards connected with it belong to one
Leader card. This means that the cards also belong to a single customer. The
group of IP trunk cards connected with one Leader is referred to as an
IP Trunk 3.01 (and later) node. If a single Meridian 1/CS 1000M system has
multiple customers requiring IP Trunk 3.01 (and later) connectivity, a
separate IP Trunk 3.01 (and later) node is required for each customer.
Multiple DCHIPs can be configured for each node.
System description
IP Trunk Description, Installation, and Operation
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