Nortel 1000 Fundamentals page 160

160 ITG engineering guidelines
Nortel recommends that any network equipment connected to the ELAN or TLAN
subnet be configured as auto-negotiate for correct operation.
I/O filter connector
The other major TLAN subnet operation problem arises from the standard
I/O filter connector in IPE modules on Large Systems.
Use the following guidelines to avoid system interruption stemming from the
standard I/O filter connector in IPE modules:
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The TLAN network interface can auto-negotiate to 100BaseT full-duplex. To
ensure the TLAN subnet can be used for voice, do the following:
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Copyright © 2007, Nortel Networks
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WARNING
Configure the ports on Layer 2 or Layer 3 switching equipment
as auto-negotiate.
If one side is manually configured, and the other side is configured
as auto-negotiate, the following situation occurs.
The auto-negotiate side sets itself to the manually configured
side's speed, but always sets itself to half-duplex transmission. If
the manually-configured side is full-duplex transmission, then a
mismatch occurs and voice quality is unsatisfactory.
Ensure that the standard IPE module I/O filter is replaced with the
provided Media Card/ITG-specific filter connector that removes filtering
from pairs 23 and 24.
Do not install the Media Card/ITG-specific filter connector on top of the
standard IPE module I/O filter connector.
Replace the IPE module backplane I/O ribbon cable assemblies with
those that have interchangeable I/O filter connectors.
The TLAN UTP cabling must meet the UTP CAT5 termination and
impedance uniformity standards.
The TLAN UTP cabling must not exceed 50 meters for the ITG-Pentium
24-port trunk card.
Install the Media Card/ITG-specific filter connector correctly by replacing
the standard IPE Module I/O filter connector.
Order new IPE Module Backplane I/O ribbon cable assemblies that have
interchangeable I/O filter connectors if it becomes necessary to use one
of the IPE Modules with molded-on I/O filter connectors.
Ensure that the TLAN UTP cabling is CAT5 compliant.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Recommendation