gl Modules Installation Guide 2003-11
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.
RJ-45 ports with
“Auto MDI/MDI-X”
twisted-pair
cable with
RJ-45 connector
fiber-optic cable
with
LC connector
Gigabit-LX or Gigabit-SX
mini-GBICs