1000base-t pin assignments, Cable testing for existing category 5 cable, Figure 24 – Brocade Communications Systems Brocade 6910 Ethernet Access Switch 53-1002580-01 User Manual
Page 43: Cros, Table 7
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.
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).
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.”
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
1
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