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110 ITG engineering guidelines
over multiple cards. This ensures that no IP trunk card exceeds its
real-time capacity.
8. 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 must 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 supports all Gatekeeper-routed calls, all locally-resolved
calls, or a mixture of both. The Leader card 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.
Table 14 "Real-time capacity of a single card node with all 32 ports enabled"
(page 111), Table 15 "Real-time capacity of a Media Card 32-port trunk card
in the Leader role" (page 111), and Table 16 "Real-time capacity of a Media
Card 32-port trunk card in the DCHIP role" (page 111) show the capacity of
the Media Card 32-port trunk card in the role of Leader card and the role
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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