Nortel Networks NN43001-563 User Manual

Page 107

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Factors that effect the real-time capacity

107

Nortel recommends that traffic on a single card ITG-Pentium 24-port trunk
card node never exceed the following:

5000 calls/hour – Gatekeeper-routed

6000 calls/hour – non-Gatekeeper-routed

In a multi-card node, the various roles necessary in processing calls, such
as Leader card, DCHIP card, and Follower card, can be divided over multiple
cards. This ensures that no IP trunk card exceeds its real-time capacity.

The maximum number of cards one DCHIP card can support is limited
by the restriction of 382 TIE trunks for one D-Channel. Therefore, only
12 Media Cards 32-port or 16 ITG-Pentium 24-port trunk cards can be
supported by one DCHIP card.

Recommendation

Nortel recommends a node never exceed the ratio of 12 Media Card 32-port
trunk cards or 16 ITG-Pentium 24-port trunk cards to one Leader card.

A node has only one Leader card; however, more then one DCHIP card can
be provisioned. If a DCHIP card fails, all IP trunk cards with channels that
use that D-channel are out of service; the remaining IP trunk card channels,
though, do remain in service. This configuration provides some redundancy
and less work for each DCHIP card.

In a multi-card node, do not have the Leader function and DCHIP function
on the same IP trunk card, unless all voice channels are disabled on that
card. A Leader card needs to have voice channels provisioned on the IP
trunk card to receive provisioning for the Gatekeeper, but disabling the voice
channels allows the Leader card to handle a significantly higher number of
calls/hour. The IP trunk card providing DCHIP functionality can be any card
in the node including the Backup Leader (Leader 1) and Follower card.
As with the Leader card, disabling the voice channels on the DCHIP card
significantly increases the number of calls/hour that can be processed.

The Leader card can support all Gatekeeper-routed calls, all locally-resolved
calls, or a mixture of both. The Leader card can support the same number
of Follower cards for all codecs with payload sizes of 10, 20, and 30
milliseconds, and with VAD on or off.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563

01.01

Standard

Release 5.0

30 May 2007

Copyright © 2007, Nortel Networks

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