SMC Networks 6152PL2 - annexe 1 Installation Manual page 52

B
Cables
Table B-2 1000BASE-T MDI and MDI-X Port Pinouts
Pin MDI Signal Name
6 Bi-directional Data Two Minus (BI_D2-)
7 Bi-directional Data Four Plus (BI_D4+)
8 Bi-directional Data Four Minus (BI_D4-)
Cable Testing for Existing Category 5 Cable
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.
Adjusting Existing Category 5 Cabling to Run 1000BASE-T
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 and
correct the problem:
1. Replace any Category 5 patch cables with high-performance Category 5e or
Category 6 cables.
2. Reduce the number of connectors used in the link.
3. Reconnect some of the connectors in the link.
B-4
(Continued)
MDI-X Signal Name
Bi-directional Data One Minus (BI_D1-)
Bi-directional Data Three Plus (BI_D3+)
Bi-directional Data Three Minus (BI_D3-)