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Figure 9 Installing a GBIC
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2 -
L i n k
T x
R x
A c t
Caution: GBICs are keyed to prevent improper insertion. If the GBIC
resists pressure, do not force it. Remove it, turn it over, and reinsert it.
3
When the electrical contacts in the rear of the GBIC are seated against the
contacts in the GBIC slot, gently press the module into the slot until you feel a
slight click.
4
Remove the rubber plug from the connectors to connect the cables.
When shorter lengths of single-mode fiber cable are used with the 1000BASE-ZX
and 1000BASE-XD GBICs, there is a risk of overloading the receiver. You may
need to insert an in-line optical attenuator at each end of the link between the fiber
optic cable plant and the receiving port on the 1000BASE-ZX or 1000BASE-XD
GBIC
(Table
4).
Table 4 In-line optical attenuators for 1000BASE-ZX and 1000BASE-XD GBICs
GBIC
1000BASE-ZX
1000BASE-XD
Chapter 4 Installing gigabit interface converters
| |
L i n k
T x
R x
A c t
Fiber optic cable span
Less than 25 km
Less than 50 km
Less than 25 km
Installing the Passport 1424T Series Layer 3 Switch
11061FA
In-line optical attenuator
10 dB
5 dB
5 dB
35
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