Make Your Own Extendable Length PoE only ethernet cable

How to use a 4-core coiled telephone cable as a stretchy PoE only ethernet cable.

01 Phone cable untouched

This RJ11 coiled phone cable was ordered from Amazon: Coiled Telephone Handset cable 3m

02 RJ-11 connectors removed   03 Sheath removed

Remove the RJ11 connectors and expose the 4 sheathed copper cores

04 4 exposed cores   05 4 exposed cores

Only 4 pins are required for PoE

The colour cores need to be placed into the matching pin of the new RJ45 connectors at both ends of the cable


 Crimp the cores into 1,2,3 and 6. These are the cores required for PoE (Alternative A), source: PoE pinout

07 RJ-45   08 Single RJ-45 in place

09 Both RJ-45 connectors in place   10 Both RJ-45 connectors in place

Once crimped, it is important to test the cable to ensure the correct pins have been crimped

11 Cable test

Pins 1,2,3 and 6 are ok

12_Setup on floor   13_Stretched setup on floor

16 Setup on tripod   17 Stretched setup on tripod

When the battery and PoE injector is attached to the base of the tripod, it is now possible to extend and retract the tripod without slack ethernet cable getting in the way.

After long periods of time being extended the coiled cable will stretch and a little slack will appear when the tripod is retracted, so far this has not been permanent change and the coiled cable has returned to the original length after a few minutes.

Credit for this idea actually belongs to my girlfriend Roz! One day whilst I was messing about with the survey equipment I explained that I would like to thread the cable up the centre of the tripod, to further tuck it away out of sight, at which point Roz casually remarked, why don’t you just use a coiled telephone cable.

3 thoughts on “Make Your Own Extendable Length PoE only ethernet cable

  1. Hi there! This is my first visit to your blog! We
    are a group of volunteers and starting a new initiative in a community
    in the same niche. Your blog provided us valuable information to work on.
    You have done a wonderful job!

    Liked by 1 person

  2. Just bought a stretchy phone cable from amazon and am going to fabricate it to use as you have. Have also bought the bits and bobs you mentioned with regards to the tracer and PoE tripod mounting solutions 🙂 Cheers nick 🙂


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