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Crossover Cables

This document shows how to properly construct an ethernet Crossover network cable. This cable can be used to cascade hubs, connecting two Ethernet hosts back-to-back without a hub or switch, or connecting two CSU/DSU's back to back for local testing of Wide Area Network (WAN) configurations. This crossover cable will work for 10BASE-T & 100BASE-TX. NOTE: You cannot use crossover cables on 100BASE-T4 devices. Use Category 5/5e unshielded twisted-pair (UTP) cable. The maximum cable distance between the port and the attached device is 100 meters (328 feet) including all patch cables, panels, and connectors. The minimum length is 1 meter (3 ft).

Cat 5 Crossover Cable:

Pin Colors on one end of Cable Pin Colors on other end of Cable
1 White/Orange (TD+) 1 White/Green (RD+)
2 Orange/White (TD-) 2 Green/White (RD-)
3 White/Green (RD+) 3 White/Orange (TD+)
4 Blue/White (N/A) 4 Blue/White (N/A)
5 White/Blue (N/A) 5 White/Blue (N/A)
6 Green/White (RD-) 6 Orange/White (TD-)
7 White/Brown (N/A) 7 White/Brown (N/A)
8 Brown/White (N/A) 8 Brown/White (N/A)

Cat 5e to 6a Crossover Cable:

Pin Colors on one end of Cable Pin Colors on other end of Cable
1 White/Orange (B+) 1 White/Green (C+)
2 Orange/White (B-) 2 Green/White (C-)
3 White/Green (C+) 3 White/Orange (B+)
4 Blue/White (A+) 4 White/Brown (D+)
5 White/Blue (A-) 5 Bronw/White (D-)
6 Green/White (C-) 6 Orange/White (B-)
7 White/Brown (D+) 7 Blue/White (A-)
8 Brown/White (D-) 8 White/Blue (A+)
Female RJ-45 Plug rj-45 plug rj-45 plug UTP Pair Colors:
  • Pair 1 - Blue
  • Pair 2 - Orange
  • Pair 3 - Green
  • Pair 4 - Brown
Category 5 wiring standards:

EIA/TIA 568A/568B and AT&T 258A define the wiring standards and allow for two different wiring color codes.

pin # eia/tia 568a at&t 258a, or eia/tia 568b ethernet 10base-t token ring fddi, atm, and tp-pmd
1 white/green white/orange x x
2 green/white orange/white x x
3 white/orange white/green x x
4 blue/white blue/white x
5 white/blue white/blue x
6 orange/white green/white x x
7 white/brown white/brown x
8 brown/white brown/white x
  • Pairs may be solid colors and not have a color stripe.
  • Category 5 cable must use category 5 rated connectors.
  • Use plenum and riser cable where applicable.