Nortel 1000 Fundamentals page 103

(and later) TLAN subnet. IP Trunk 3.01 (and later) registers and re-registers
with a Gatekeeper. Unless the Time To Live (TTL) value is extremely low
(under 15 seconds), the TTL has a very minor effect on the Leader card.
Single card role
The role of the IP trunk card in a single card node should not be impacted
by real-time limitations. The only consideration that limits the capacity of a
single Card node is the number of QoS endpoints being monitored. This
has the same effect on single card nodes as it does on Leader cards. As for
all cards with voice channels, there is an increase in the amount of work
involved with Gatekeeper-routed calls. This increase in most cases, is not
significant enough to affect most customer configurations.
Backup Leader/Follower role
The Backup Leader/Follower card roles have no additional real-time impacts
over normal call processing, which is primarily governed by the customer
traffic profile. If the IP Trunk 3.01 (and later) node is making mostly
Gatekeeper-routed calls, there is an increase in call processing, but the
effects on the Follower card are minimal.
The real-time capacity of the Leader Card depends on various factors,
including the following:
1. Host module CPU – Intel Pentium-based or Intel StrongARM (SA).
2. The number of ports on the Leader Card configured to transmit voice or
3. The size of the IP Trunk 3.01 (and later) network (number of nodes
4. The endpoint types, such as IP Trunk 3.01 (and later), ITG Trunk 2.0, or
5. Average Hold Time (AHT) of calls and the distribution of incoming calls.
6. Number of probe packets sent to every Leader Card at a remote node.
Factors 1, 2, 4, and 5 significantly impact the real-time capacity of the
Leader card. Factors 3 and 6 impact the real-time requirement of the
Network Monitoring Module on the Leader Card.
In IP Trunk 3.01 (and later), factors 1, 2, and 5 also impact the real-time
capacity of the IP trunk card providing DCHIP functionality.
Copyright © 2007, Nortel Networks
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fax traffic, the selected codec, and voice sample size.
in the network).
BCM are how calls are routed (Gatekeeper-routed or not).
Nodes that have a high number of incoming calls, such as call centers,
place a large load on the CPU and system. For more information, see
"System performance under heavy load" (page
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
IP Trunk 3.01 (and later) traffic engineering 103
428).