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Connecting Category 5 Cable
To connect to a 1000BASE-T Gigabit Ethernet device, use the RJ-45
connector on the network card and Category 5, 5e or better UTP
cable. This connection can be made directly to the device, or
indirectly via a wall outlet that has the proper wiring for an RJ-45
connector. Connections can be made for a distance of 100m
(328 ft). It is recommended that for all critical connections, or any
new cable installations, Category 5e (enh anced Category 5) cable
should be used. The Category 5e specification includes test
parameters that are only recommendations for Category 5.
Therefore, the first step in preparing existing Category 5 cabling for
running 1000Base-T is a simple test of the cable installation to be
sure that it complies with the IEEE 802.3ab standards.
Cable Testing for Existing Category 5 Cable
Installed Category 5 cabling must pass tests for Attenu ation,
Near-End Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This
cable testing information is specified in the ANSI/TIA/EIA-TSB-67
standard. Additionally, cables must also pass test parameters for
Return Loss and Equal-Level Far-End Crosstalk (ELFEXT).
These tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The
Additional Transmission Performance Guidelines for 100 Ohm
4-Pair Category 5 Cabling.” When testin g your cable installation, be
sure to include all patch cables between switches and end devices.
Adjusting Existing Category 5 Cabling to Run
1000BASE-T
If your existing Category 5 installation does not meet one of the te st
parameters for 1000Base-T, there are basically three measures that
can be applied to try to correct the problem:
1. Replace any Category 5 patch cables with high-performance
Category 5e cables.
2. Reduce the number of connectors used in the link.
3. Reconnect some of the connectors in the link.