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xcvrs_3-2002.fm Page 6 Tuesday, April 2, 2002 3:23 PM
Note on 1000Base-T Cable Requirements. The Category 5 networking
cables that work for 100Base-TX connections should also work for
1000Base-T, as long as all four-pairs are connected. But, for the most robust
connections you should use cabling that complies with the Category 5E
specifications, as described in Addendum 5 to the TIA-568-A standard
(ANSI/TIA/EIA-568-A-5).
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. Site cabling that is 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), Multiple Disturber 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.
To connect a twisted-pair cable
to a transceiver:
Push the RJ-45 plug into the RJ-45
jack until the tab on the plug clicks
into place.
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RJ-45 connector
Category 5 or better
UTP or STP cable:
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