1000Base-T Pin Assignments; Cable Testing For Existing Category 5 Cable; Adjusting Existing Category 5 Cabling To Run 1000Base-T - SMC Networks EliteConnect SMCE21011 User Manual

| Cables and Pinouts
A C
PPENDIX

1000BASE-T Pin Assignments

1000BASE-T P A
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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.
Use 100-ohm Category 5, 5e or 6 unshielded 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).
Table 33: 1000BASE-T MDI and MDI-X Port Pinouts
Pin MDI Signal Name
1 Bi-directional Pair A Plus (BI_DA+)
2 Bi-directional Pair A Minus (BI_DA-)
3 Bi-directional Pair B Plus (BI_DB+)
4 Bi-directional Pair C Plus (BI_DC+)
5 Bi-directional Pair C Minus (BI_DC-)
6 Bi-directional Pair B Minus (BI_DB-)
7 Bi-directional Pair D Plus (BI_DD+)
8 Bi-directional Pair D Minus (BI_DD-)
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.
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:
Replace any Category 5 patch cables with high-performance Category
1.
5e or Category 6 cables.
– 250 –
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-)