Nortel Networks NN43001-563 - Manual (Page 426)

426 Maintenance
Normal
Code Fault
Code
Description
BLDR Card has detected existing Active Leader and is
running Backup Leader tasks, or the card is configured
as a leader and is missing its node properties. Transmit
node properties from TM 3.1.
FLR Card has detected the Active Leader and is running
Follower tasks.
System performance under heavy load
When the system and IP Trunk 3.01 (and later) are carrying traffic
approaching the maximum sustained levels, there can be short bursts
of traffic exceeding the maximum threshold level. This is caused by the
randomness of call starts. When the maximum threshold levels are
exceeded, error messages are printed to the system screen. In extreme
cases, it can cause call loss.
The different components within the system each have different maximum
thresholds of traffic and have different ways of measuring and reacting to
those traffic levels. Most components, such as the D-channel card in the
system and the IP trunk card, have the capability to discard messages
when necessary. These recovery methods can be mitigated by proper
system engineering, but cannot be avoided completely. For example,
random calls can create situations where more messages attempt to travel
down the D-channel than the D-channel can handle. The D-channel has
a fixed maximum bit-rate. When that maximum is exceeded, messages
are discarded.
The effects of this recovery process usually appear as certain error
messages. These error messages can be viewed by checking log messages
on the system.
The following error messages occur when narrow (peak) bursts of traffic or
messaging exceed the maximum sustained rate by a significant margin,
resulting in call failure or signaling failure.
Message: PRI241
Description
PRI241 is defined as a protocol error where no response to the PRI call
occurred at the far end.
Normal cause
Peak traffic caused either the system D-channel or the IP trunk card to
discard messages.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.