Brocade Communications Systems 53-1002580-01 Manuel D’Utilisation
Brocade 6910 Ethernet Access Switch Hardware Installation Guide
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53-1002580-01
Twisted-Pair Cable and Pin Assignments
B
FIGURE 24
CROSSOVER WIRING
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, or to other switches or hubs.
cables for all network connections to PCs or servers, or to other 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.
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).
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/EIA-TSB-95 Bulletin, “The
Additional Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”
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.”
TABLE 7
1000BASE-T MDI and MDI-X PORT PINOUTS
Pin
MDI Signal Name
MDI-X Signal Name
1
Bi-directional Pair A Plus (BI_DA+)
Bi-directional Pair B Plus (BI_DB+)
2
Bi-directional Pair A Minus (BI_DA-)
Bi-directional Pair B Minus (BI_DB-)
3
Bi-directional Pair B Plus (BI_DB+)
Bi-directional Pair A Plus (BI_DA+)
4
Bi-directional Pair C Plus (BI_DC+)
Bi-directional Pair D Plus (BI_DD+)
5
Bi-directional Pair C Minus (BI_DC-)
Bi-directional Pair D Minus (BI_DD-)
6
Bi-directional Pair B Minus (BI_DB-)
Bi-directional Pair A Minus (BI_DA-)
7
Bi-directional Pair D Plus (BI_DD+)
Bi-directional Pair C Plus (BI_DC+)
8
Bi-directional Pair D Minus (BI_DD-)
Bi-directional Pair C Minus (BI_DC-)
Orange
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
Green
Brown
Blue
White/Orange Stripe
White/Green Stripe
White/Blue Stripe
White/Brown Stripe
End B
End A
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Crossover Cable