[SOLVED] Help with Cat5 cable wires' colour coding

[dpaul]

Hello,

I have this Cat5 cable dangling at my celler and provides wired connectivity to other floors of the house (they are now disconnected of course).

I wish to connect then to a patch panel. But the wires' colouring looks different Specially the red and blue coulored wires, please see the pic below.

Now I am aware of the T568-A and -B Wiring standards, but the above one confuses me. In fact the Patch Panel where I will connect has clearly marked places for the A & B standards.

So how do I connect the one show in the picture to my Patch Panel? Can anyone please tell me the colour to colour matching?

Any help is greatly appreciated!

 

[std_match]

I don't think it is a CAT5 cable. Any markings on it?
Maybe it was used for phone or intercom?

 

[dpaul]

Probably not....I am not sure! I also did not see any special markings, but I will check again.
btw - there are telephone sockets at the 1st floor for DSL connectivity. But the cable shown in the pic is not connected to this telephone socket.

Using this cable I MUST transmit Ethernet connectivity from the cellar to the roof floor. The router is located at the celler/basement. I am installing a Patch panel and linking the wires. I do not want to WiFi repeaters.
The cable pic shown runs through the walls, and end up at an RJ45 socket at the roof-floor.

What should I do?

 

[KlausST]

Hi,

maybe a telephone line.
But I see (correct me if I´m wrong) shielding sheet as well as shielding strands. So maybe it is CAT5.

I personally think there is a good chance that it will work for 100MBit ethernet.
Try it. Not much to lose.

The most important: treat paris as pairs (according original ethernet wiring) and don´t confuse polarity of the pairs.

Otherwise: Transmitting a differential signal via two wires of different (twisted) pairs .. will cause a lot of echoing, crosstalk and loss. No high data rate possible.

Klaus

 

[FvM]

Yes, it's telephone cable. Works well for Ethernet, need to define your own pair mapping.

--- Updated Dec 12, 2024 ---

Expect that it even works for 1000BASE-T with reduced length, e.g. 10 or 20 m. I plan to try in my home.

 

[dick_freebird]

I would take a picture of the "good" end to get
the order right and crimp on the "bad" end
connector the same.

But you might also elect to use the "incumbent"
as a pull for a known-proper cable with factory
molded ends. If the cable can be pulled through.
My success rate at clean re-plugging Ethernet
cables is 50% or so.

Might also decide to pull a good "fish line" at
the same time, just in case more wanted some
day.

 

[dpaul]

The most important: treat paris as pairs (according original ethernet wiring) and don´t confuse polarity of the pairs.

Yes I will try that out...keeping "pairs as pairs" and connecting them seems to be the thing to try out!

Thanks everyone for the suggestions.

 

[dpaul]

Solved it finally using the chart I created. Posting it here for the benefit of others. I was following the A connection colour code for the Patch Panel and Wall socket!
Needless to say, I have checked the availability of Ethernet connectivity at all floors, out of those all RJ45 sockets. So the connectivity now looks like this:
DSL twisted cable pair in --> DSL Modem + Router --> Patch Panel --> Cat5 to Wall Socket --> Wall Socket to laptop (last mile).

Most of the work done was physical in nature at the Patch Panel and following the same connectivity sequence, correctly connecting the coloured twisted pairs inside the Wall Sockets.