CABLES
Table B-2 1000BASE-T MDI-X and MDI Port Pinouts
| 1000BASE-T MDI-X and MDI Port Pinouts |
| | |
Pin | MDI-X Signal Name | MDI Signal Name |
| | |
1 | Bi-directional Data Two Plus | Bi-directional Data One Plus |
| (BI_D2+) | (BI_D1+) |
| | |
2 | Bi-directional Data Two Minus | Bi-directional Data One Minus |
| (BI_D2-) | (BI_D1-) |
| | |
3 | Bi-directional Data One Plus | Bi-directional Data Two Plus |
| (BI_D1+) | (BI_D2+) |
| | |
4 | Bi-directional Data Four Plus | Bi-directional Data Three Plus |
| (BI_D4+) | (BI_D3+) |
| | |
5 | Bi-directional Data Four Minus | Bi-directional Data Three Minus |
| (BI_D4-) | (BI_D3-) |
| | |
6 | Bi-directional Data One Minus | Bi-directional Data Two Minus |
| (BI_D1-) | (BI_D2-) |
| | |
7 | Bi-directional Data Three Plus | Bi-directional Data Four Plus |
| (BI_D3+) | (BI_D4+) |
| | |
8 | Bi-directional Data Three Minus | Bi-directional Data Four Minus |
| (BI_D3-) | (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. 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.
