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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 (Nortel Networks part number 201540-B)
The publication is available on the World Wide Web at
support.baynetworks.com/library/tpubs/
At the Web site, click on Passport 8132 under the Routing
Switches heading.