Nortel Networks NN43001-563 User Manual

Page 161

IP Trunk 3.01 (and later) LAN installation and configuration

161

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.

Recommendation

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:

•

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.

The TLAN network interface can auto-negotiate to 100BaseT full-duplex. To
ensure the TLAN subnet can be used for voice, do the following:

•

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.

•

Always keep the TLAN UTP cabling to less than 50 meters for the
ITG-Pentium 24-port trunk card.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563

01.01

Standard

Release 5.0

30 May 2007