
GBIC Type and Hardware/Software Support
Extreme Networks Consolidated Hardware Guide 37
Preparing to Install or Replace a GBIC
This section describes the preparation steps that you must perform before inserting and securing a
GBIC.
CAUTION
GBICs can emit invisible laser radiation. Avoid direct eye exposure to beam.
To ensure proper installation, complete the following tasks before inserting the GBIC:
1 Inspect and clean the fiber tips, coupler, and connectors.
2 Prepare and clean an external attenuator, if needed.
3 Calculate the link budget.
4 Do not stretch the fiber.
5 Make sure the bend radius of the fiber is not less than 2 inches.
In addition to the previously described tasks, Extreme Networks recommends the following when
installing or replacing GBICs on an active network:
1 Use the same type of GBIC at each end of the link.
2 Connect one end of the link to the Tx port. Without an attenuator, measure the total loss from the Tx
port to the other site of the link. For example, the total loss must not exceed the total optical system
budget listed in Figure 2.
3 Use dispersion shifted fiber whenever possible. This provides superior performance in the 1550 nm
range.
After you complete all of these described tasks, you are ready to install or replace a GBIC.
Installing or Replacing a GBIC
You can add and remove GBICs from your Extreme Networks switch without powering off the system.
Figure 3 shows the three types of GBIC connectors.
Figure 3: GBIC modules
GBICs are a Class 1 laser device. Use only Extreme-approved devices.
EW_GBIC
Module A Module B Module C
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