1000Base-Lx Multimode Applications - Nortel 2000 Using Manual

Appendix C Media dependent adapters 367

1000BASE-LX multimode applications

For 1000BASE-LX multimode applications, the longwave gigabit transceivers
must be mode conditioned externally via a special offset SMF/MMF patch cord.
The offset SMF/MMF patch cord allows the same transceiver to be used for both
multimode and single-mode fiber. See your Nortel Networks sales representative
for more information about the SMF/MMF patch cord.
The 1000BASE-LX transceiver is designed to mechanically accommodate the
single-mode ferrules used on one end of the special offset SMF/MMF patch cord.
Multimode ferrules must not be used because they can bind and cause damage to
the transceiver.
Do not connect multimode cables directly into the 1000BASE-LX MDA
transceiver. Instead, connect a special offset SMF/MMF patch cord into the
transceiver, and then connect the multimode cable into the SMF/MMF patch cord.
For more information about gigabit transmission over fiber optic cable and mode
conditioning, refer to the following publication: Reference Note: Gigabit Ethernet
Physical Layer Considerations (Part number 201540-B). This publication is
available at the www.nortelnetworks.com/documentation URL. (The product
family for the BPS 2000 is Data and Internet.)
Using the Business Policy Switch 2000 Version 1.2