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The table below shows the 1000BaseT MDI and MDI-X port pinouts. These ports require that all four pairs of wires be connected. Note that for 1000BaseT operation, all four pairs of wires are used for both transmit and receive.
Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for 1000BaseT connections. The length of any twisted-pair connection must not exceed 100 meters (328 feet).
Pin | MDI Signal Name | MDI-X Signal Name |
| | |
1 | Bi-directional Data One Plus (BI_D1+) | Bi-directional Data Two Plus (BI_D2+) |
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2 | Bi-directional Data One Minus (BI_D1-) | Bi-directional Data Two Minus (BI_D2-) |
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3 | Bi-directional Data Two Plus (BI_D2+) | Bi-directional Data One Plus (BI_D1+) |
| | |
4 | Bi-directional Data Three Plus (BI_D3+) | Bi-directional Data Four Plus (BI_D4+) |
| | |
5 | Bi-directional Data Three Minus (BI_D3-) | Bi-directional Data Four Minus (BI_D4-) |
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6 | Bi-directional Data Two Minus (BI_D2-) | Bi-directional Data One Minus (BI_D1-) |
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7 | Bi-directional Data Four Plus (BI_D4+) | Bi-directional Data Three Plus (BI_D3+) |
| | |
8 | Bi-directional Data Four Minus (BI_D4-) | Bi-directional Data Three Minus (BI_D3-) |
| | |
C.3 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 specifications are contained in the ANSI/TIA/EIA-TSB-67 standard. Cables must pass test parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These tests are contained in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”
Note: When testing the cable installation, be sure to include all patch cables between switches and end devices.
C.3.1 Adjusting Existing Category 5 Cabling to Run 1000BaseT
If your existing Category 5 installation does not meet one of the test parameters for 1000BaseT, follow these measures to correct the problem:
Replace any Category 5 patch cables with high-performance Category 5e or Category 6 cables.
Reduce the number of connectors used in the link.
Reconnect some of the connectors in the link.
C.4 Fiber Standards
The current TIA (Telecommunications Industry Association) 568-A specification on optical fiber cabling consists of one recognized cable type for horizontal subsystems and two cable types for backbone subsystems.
Horizontal 62.5/125 micron multimode (two fibers per outlet).
Backbone 62.5/125 micron multimode or singlemode.
IntraCore IC3624PWR Layer 2 PoE Switch with Dual Gigabit