B-2
Switch Ports and Network Cables
Switch Ports
Switch Ports and Network
Cables
Because of the increased speed provided by 1000Base-T (Gigabit-T), network
cable quality is more important than for either 10Base-T or 100Base-TX.
Cabling plants being used to carry 1000Base-T networking must comply with
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.
Fiber-Optic Cables
Port Type Cable Specifications Connector Type Maximum Length
Gigabit-SX 62.5/125 mm or 50/125 μm (core/cladding)
diameter, graded-index, low metal content,
multimode fiber-optic cables, complying
with the ITU-T G.651 and ISO/IEC 793-2 Type
A1b or A1a respectively.
LC • 62.5 μm cable:
– 160 MHz*Km=220 meters
– 200 MHz*Km=275 meters
• 50 μm cable:
– 400 MHz*Km=500 meters
– 500 MHz*Km=550 meters
Gigabit-LX 9/125 μm (core/cladding) diameter, graded-
index, low metal content, single mode fiber-
optic cables, complying with the ITU-T G.652
and ISO/IEC 793-2 Type B1 standards.
Or, the multimode fiber-optic cables listed for
Gigabit-SX.
LC • Single-mode cable:
10 kilometers
• Multimode cable:
550 meters
Note: To use multimode cables for Gigabit-LX, a mode conditioning patch cord may be needed - See
“Mode Conditioning Patch Cord for Gigabit-LX” on page B-3 for more information.
Gigabit-LH 9/125 mm (core/cladding) diameter, graded-
index, low metal content, single mode fiber-
optic cables, complying with the ITU-T G.652
and ISO/IEC 793-2 Type B1 standards.
LC 70 kilometers
Note: The transmission distances are dependent on the particular fiber loss and coupling loss involved, among other
factors, and can be estimated from the optical loss budget. 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.
100-FX 62.5/125 mm or 50/125 μm (core/cladding)
diameter, graded-index, low metal content,
multimode fiber-optic cables, complying
with the ITU-T G.651 and ISO/IEC 793-2 Type
A1b or A1a respectively.
LC • half duplex: 412 m
• full duplex: 2 km
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