1000Base-T Cable Requirements; Table B-2. 1000Base-T Mdi-X And Mdi Port Pinouts - SMC Networks 8648T Installation Manual

Table B-2. 1000BASE-T MDI-X and MDI Port Pinouts

Pin MDI-X Signal Name
1
Bi-directional Data Two Plus (BI_D2+)
2
Bi-directional Data Two Minus (BI_D2-)
3
Bi-directional Data One Plus (BI_D1+)
4
Bi-directional Data Four Plus (BI_D4+)
5
Bi-directional Data Four Minus (BI_D4-)
6 Bi-directional Data One Minus (BI_D1-)
7
Bi-directional Data One Plus (BI_D3+)
8
Bi-directional Data Three Minus (BI_D3-)

1000BASE-T Cable Requirements

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) or 6 cable
should be used. The Category 5e and 6 specifications include 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 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.
T -P C
WISTED AIR
MDI Signal Name
Bi-directional Data One Plus (BI_D1+)
Bi-directional Data One Minus (BI_D1-)
Bi-directional Data Two Plus (BI_D2+)
Bi-directional Data Three Plus (BI_D3+)
Bi-directional Data Three Minus (BI_D3-)
Bi-directional Data Two Minus (BI_D2-)
Bi-directional Data One Plus (BI_D4+)
Bi-directional Data Four Minus (BI_D4-)
P A
ABLE AND IN SSIGNMENTS
B-5