1000Base-T Pin Assignments; Cable Testing For Existing Category 5 Cable; Adjusting Existing Category 5 Cabling To Run 1000Base-T - AMX NXA-ENET8-2POE Operation/Reference Manual

1000BASE-T Pin Assignments

All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for
all network connections to PCs or servers, switches or hubs.
The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports require that all four pairs
of wires be connected. Note that for 1000BASE-T operation, all four pairs of wires are used for both transmit
and receive.
1000BASE-T MDI and MDI-X Port Pinouts
Pin
1
2
3
4
5
6
7
8
Use 100-ohm Category 5, 5e or 6 un-shielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for
1000BASE-T connections. Also be sure that the length of any twisted-pair connection does not exceed 100
meters (328 feet).

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/EIATSB-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.
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch
MDI Signal Name
Bi-directional Pair A Plus (BI_DA+)
Bi-directional Pair A Minus (BI_DA-)
Bi-directional Pair B Plus (BI_DB+)
Bi-directional Pair C Plus (BI_DC+)
Bi-directional Pair C Minus (BI_DC-)
Bi-directional Pair B Minus (BI_DB-)
Bi-directional Pair D Plus (BI_DD+)
Bi-directional Pair D Minus (BI_DD-)
Cables and Pinouts
MDI-X Signal Name
Bi-directional Pair B Plus (BI_DB+)
Bi-directional Pair B Minus (BI_DB-)
Bi-directional Pair A Plus (BI_DA+)
Bi-directional Pair D Plus (BI_DD+)
Bi-directional Pair D Minus (BI_DD-)
Bi-directional Pair A Minus (BI_DA-)
Bi-directional Pair C Plus (BI_DC+)
Bi-directional Pair C Minus (BI_DC-)
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