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724-746-5500 | blackbox.com
Page 230
LGB5028A User‘s Manual
724-746-5500 | blackbox.com
Appendix C: Cables
EIA/TIA 568B RJ-45 Wiring Standard, 10/100BASE-TX Straight-through Cable
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
End A
End B
Figure C-2. Straight-through Wiring
C.4 Crossover Wiring
If the twisted-pair cable is to join two ports, and both ports are labeled with an “X” (MDI-X) or neither port is labeled with an
“X” (MDI), a crossover must be implemented in the wiring. (When autonegotiation is enabled for any RJ-45 port on this switch,
you can use either straight-through or crossover cable to connect to any device type.)
You must connect all four wire pairs as shown in Figure C-3 to support Gigabit Ethernet.
EIA/TIA 568B RJ-45 Wiring Standard, 10/100BASE-TX Crossover Cable
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
End A
End B
Figure C-3. Crossover wiring.
C.5 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.
Table C-2 shows the 1000BASE-T MDI and MDI-X port pinouts. These ports require that all four pairs of wires be connected.
NOTE: 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 328 feet (100 m).