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.