10
Installing the gl Modules
Module
Cable Type
Maximum Length
100/1000-T gl Module
100 Mbps operation:
category 5, 100-ohm
differential twisted-pair
cable
100 meters
1000 Mbps (Gigabit)
operation:
category 5E,
100-ohm cable is
recommended, although
category 5 cable may also
work.
100 meters
Note:
In the module’s default configuration, Auto,
either a straight-through or crossover cable can be used
to connect
the module to either another Gigabit device or to a 100Base-T device. See the Note on Automatic Cable Sensing on
page 11
.
mini-GBIC gl Module
Gigabit-SX operation:
multimode
fiber-optic
cables that are fitted with
LC connectors
220 meters to 550
meters, depending on
the cable used. See
“Fiber-Optic Cables”
on
page 24
for more
information.
Gigabit-LX operation:
single-mode
fiber-optic
cables fitted with LC
connectors.
multimode
fiber-optic
cables may also be
used—see “Fiber-Optic
Cables” on
page 24
.
•
single-mode cable:
10 kilometers
•
multimode cable:
550 meters
Gigabit-LH operation:
the same
single-mode
cables as for Gigabit-LX.
70 kilometers
Notes:
Gigabit-LX
– If multimode cable is used, a
mode conditioning patch cord
may be needed — see “Mode Conditioning
Patch Cord” on
page 25
for more information.
Gigabit-LH
– Between the transmit and receive ends of the cable, at least 5dB of attenuation is required for a reliable
connection. This is equivalent to 20Km of the fiber-optic cable. For distances less than 20Km, you must add attenuators
to bring the total attenuation to at least 5dB. Most cable vendors carry attenuators.
Continued on the next page.
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fiber-optic cable
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mini-GBICs
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