Nortel Networks 350 manual 1000BASE-LX Multimode Applications

Using the BayStack 350 10/100/1000 Series Switch

Table B-3. 1000BASE-LX MDA Components

Item Label Description

On: The corresponding Phy port is active.

Off: The corresponding Phy port is in backup mode or there is no connection to this port.

3 Activity Port activity LEDs (green):

Blinking: Indicates network activity level for the corresponding port. A high level of network activity can cause LEDs to appear to be on continuously.

4 1000BASE-FX SC port connectors.

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 Bay Networks sales representative for more information about the SMF/MMF patch cord.

The 1000BASE-LX transceiver is designed to mechanically accomodate 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 (Bay 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 Accelar under the Routing Switches heading.

B-10 304376-B Rev 00