A-4
Specifications
Cabling and Technology Information
the IEEE 802.3ab standards. In particular, the cabling must pass tests for
Attenuation, Near-End Crosstalk (NEXT), and Far-End Crosstalk (FEXT).
Additionally, unlike the cables for 100Base-TX, the 1000Base-T cables must
pass tests for Equal-Level Far-End Crosstalk (ELFEXT) and Return Loss.
When testing your cabling, be sure to include the patch cables that connect
the switch and other end devices to the patch panels on your site. The patch
cables are frequently overlooked when testing cable and they must also
comply with the cabling standards.
Technology distance specifications
Table A-3.
Mode Conditioning Patch Cord
The following information applies to installations in which multimode fiber-
optic cables are connected to a Gigabit-LX port. Multimode cable has a design
characteristic called “Differential Mode Delay”, which requires the transmis-
sion signals be “conditioned” to compensate for the cable design and thus
prevent resulting transmission errors.
Technology Supported cable type Multimode fiber
modal bandwidth
Supported distances
100-FX multimode fiber any up to 2,000 meters
100-BX single mode fiber N/A 0.5 - 10,000 meters
1000-T twisted-pair copper N/A up to 100 meters
1000-SX multimode fiber 160 MHz*km
200 MHz*km
400 MHz*km
500 MHz*km
2 - 220 meters
2 - 275 meters
2 - 500 meters
2 - 550 meters
1000-LX multimode fiber
single mode fiber
400 MHz*km
500 MHz*km
N/A
2 - 550 meters
2 - 550 meters
2 - 10,000 meters
1000-LH single mode fiber N/A 10 - 70,000 meters
1
1
For distances less than 20km, a 10dB attenuator must be used. For distances between 20km
and 40km, a 5dB attenuator must be used. Attenuators can be purchased from most cable
vendors.
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