SMC Networks 1000 Manual De Usuario

B-4

All Category 5 UTP cables that are used for 100BASE-TX 
connections should also work for 1000BASE-T, providing that all 
four wire pairs are connected. However, it is recommended that for 
all critical connections, or any new cable installations, Category 5e 
(enhanced 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. 

Installed Category 5 cabling must pass tests for Attenuation, 
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.”

Note that when testing your cable installation, be sure to include all 
patch cables between switches and end devices.

If your existing Category 5 installation does not meet one of the test 
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.