How to Connect Straight Through to a Crossover Cable

Written by dave wilson
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How to Connect Straight Through to a Crossover Cable
A crossover adaptor can convert a straight through network cable into a crossover cable. (network cable image by Radoslav Lazarov from

The two types of CAT6 network patch cables most commonly used are called "straight through" and "crossover" cables. The straight through cables are wired so each conductor is in the same position at both ends of the cable. The crossover cables are wired similarly, except that positions one and three and positions two and six are swapped on each end. Crossover cables are used to connect same-type network devices. For example, if you need a crossover cable to connect two network switches, but only have straight through cable, a crossover adaptor can resolve the issue. When a crossover cable is unavailable, you can build a CAT6 crossover adaptor to convert straight through cables.

Skill level:

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Things you need

  • Eight-pin CAT6 coupler
  • Three-inch CAT6 cable
  • Two RJ45 CAT6 connectors
  • CAT6 cable-stripping tool
  • RJ45 connector-crimping tool

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  1. 1

    Cut one inch of the protective sheath from each end of the CAT6 cable. Untwist, straighten and separate a half-inch of each twisted pair set of wires at both ends of the cable.

  2. 2

    Insert the wires at one end of the CAT6 cable into an RJ45 CAT6 connector following the wire pinout specified below. Count the pins from left to right by positioning the RJ45 CAT6 connector with the socket facing toward you and the connector tab facing down.

    Pin 1: White/Green wire

    Pin 2: Green wire

    Pin 3: White/Orange wire

    Pin 4: Blue wire

    Pin 5: White/Blue wire

    Pin 6: Orange wire

    Pin 7: White/Brown wire

    Pin 8: Brown wire

    Each wire must touch the end of its RJ45 slot. Verify that the protective sheath is inside the connector socket.

  3. 3

    Insert the RJ45 connector into the crimping tool and clamp down on the handle to press all RJ45 pins through the wires.

  4. 4

    Perform the same procedure above on the other end of the cable, but use this wire pinout map:

    Pin 1: White/Orange wire

    Pin 2: Orange wire

    Pin 3: White/Green wire

    Pin 4: Blue wire

    Pin 5: White/Blue wire

    Pin 6: Green wire

    Pin 7: White/Brown wire

    Pin 8: Brown wire

  5. 5

    Plug one end of the small crossover cable just constructed into the RJ45 couple. The straight through to crossover adaptor is now ready for use.

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