Suppose you were going for a 26+ hours flight, and suppose you had limited luggage allowance...what would you do with your fantastic (but nonetheless heavy...) crimping tool? But who cares!

You just need a physical loopback adapter :D

Here I'll show you how to make one without using a crimping tool:

  1. Buy a short standard cat.5e ethernet patch cable.
  2. Cut one of its ends (scissors, knife or strip it badly by rubbing it on the edge of a walkway).
  3. Once you have your short piece of cable, you need to remove the plastic from the pairs protecting the copper: this can be done with your teeth (!).
  4. Connect the pairs between them, such as to close the circuit, basically, as you'd do while connecting the pairs of a crossover cable to the other end.

Here's the right scheme:

OrangeWhite joined to GreenWhite.


Orange joined to Green.


Blue joined to BrownWhite.


BlueWhite joined to Brown.


Andrea's Physical Loopback Adapter

Once your pairs are joined, isolate them one-another (i.e.: with some scotch or duct tape).

Well done! Now you have a new physical gigabit loopback adapter like the one shown in the picture!

Senior Professional Network and Computer Systems Engineer during work hours and father when home.

Andrea strives to deliver outstanding customer service and heaps of love towards his family.

In this Ad-sponsored space, Andrea shares his quest for "ultimate" IT knowledge, meticulously brought to you in an easy to read format.

How to make a loopback adapter without crimping tools.
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One comment on “How to make a loopback adapter without crimping tools.

  • Helpful information. Lucky me I discovered your website by chance, and I am stunned why this twist of fate didn't happened in advance! I bookmarked it.

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