The Read-Only WDM GBIC (WDM-GBIC-REC=) has only one optical bore (receive).
Step 4
Immediately attach the network interface cable optical connector to the transceiver.
Always grasp the SC or the LC connector housing rather than the fiber-optic cable to plug or unplug the fiber-optic cable.
Mode-Conditioning Patch Cord
When using the long-wavelength and long-haul (LX and LH) GBIC with 62.5-micron diameter multimode
fiber (MMF), you must install a mode-conditioning patch cord (Cisco product number CAB-GELX-625 or
equivalent) between the GBIC and the MMF cable on both the transmit and receive ends of the link.
When an unconditioned laser source designed for operation on single-mode optical fiber (SMF) is directly
coupled to an MMF cable, an effect known as differential mode delay (DMD) might result in a degradation
of the modal bandwidth of the optical fiber cable. This degradation results in a decrease in the link span (the
distance between a transmitter and a receiver) that can be supported reliably. The effect of DMD can be
overcome by conditioning the launch characteristics of a laser source. A practical means of performing this
conditioning is to use a device called a mode-conditioning patch cord.
A mode-conditioning patch cord is required for 1000BASE-LX and LH applications over FDDI-grade, OM1,
and OM2 fiber-cable types. Mode-conditioning patch cords should not be used for applications over OM3
fiber cable (laser-optimized fiber cable). For more information about mode-conditioning patch cords, see the
Use of Mode Conditioning Patch Cables in Gigabit Ethernet and 10 Gigabit Ethernet Laser-Based Transmissions
bulletin available on Cisco.com.
Figure 12: Mode Conditioning Patch Cord with SC (GBIC Transceiver) Connector
MMF6Beige color identifier1
Single-mode fiber (SMF)7To Gigabit Ethernet interface2
Offset junction8RX (receiver)3
To cable plant9TX (transmitter)4
Blue color identifier5
Catalyst 6800 Ethernet Module Installation Guide
32
Installing and Removing Modules, Transceivers, and Attaching Cables
Mode-Conditioning Patch Cord
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