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Chapter 4 Configuring the Gigabit Ethernet Ports
Installing, Removing, and Maintaining GBICs
4-6
Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide
78-6286-05
• When using the 1000BASE-LX/LH GBIC with 62.5-micron diameter MMF,
you must install a mode-conditioning patch cord between the MMF
fiber-optic network and the GBIC. The mode-conditioning patch cord
(CAB-GELX-625 or equivalent) is required to comply with IEEE standards.
See the “Patch Cord” section on page 4-10 for more information.
• You must insert a 10-dB inline optical attenuator between the single-mode
fiber-optic network and the receiving port on the 1000BASE-ZX GBIC at
each end of the link if the link length is less than 15.5 miles (25 km).
• You must insert a 5-dB inline optical attenuator between the single-mode
fiber-optic network and the receiving port on the 1000BASE-ZX GBIC at
each end of the link if the link is greater than 15.5 miles (25 km), but less than
31 miles (50 km).
Installing GBICs
This section describes how to install GBICs.
Caution Unnecessary removal and insertion of a GBIC could lead to premature failure of
the GBIC. A GBIC has a lifetime of 100 to 500 removals and insertions.
A switch can be shipped with or without GBICs installed.
Caution When removing or inserting a GBIC, always wear an ESD wrist strap connected
to the ESD wrist strap connector. For more information about ESD, refer to the
Site Preparation and Safety Guide.
Note GBICs are online swappable.