Home made network cable problems

feet_up

I have put rj45 plugs on my network cable between a cctv camera and the NVR.

Although when connected with professional cables they work ok, my home made ones don't. The green light on the NVR (showing power?) is lit but no signal comes through and the green light on the camera which shouid fllickers when in use does not..

I'm sure therefore it is my cable! However I have a Network Cable Tester and it shows that all 8 wires are connected.

My options are to redo both RJ45 Plugs even though they are connected Ok (according to my tester) or re-cable the camera using a ready made cable. This would involve ladders and drilling through 3 walls.

Where might I be going wrong?

k_man

Have you followed a wiring/pin standard?

e.g.
https://www.tlc-direct.co.uk/Technical/Networking/Networking.htm

The 8 wires are in 4 twisted pairs, and the order of usage matters.
And it is not the expected order

Pairs go to the following pins

1,2
3,6
4,5
7,8

A cable tester 'may' only test continuity rather than correct pairing.

Movie_Star

Straight through or cross-over comes to mind. Also the CAT rating, 5 or 6. Is the length too long, is there too much resistance in the wire? Things to look at.

feet_up

Thanks for the quick and helpful replies. I think I have the wiring ok as RJ45 568, and I used pass through plugs so I got it right and could check  that and because there is continuity I would have to have made the sam mistake twice.

It's Cat 5 and a relatively short run. It worked ok before I changed the ends (which I did because of a corroded plug.)

k_man

The new (pass through) plugs may not connect/seat correctly.

Can you test the cable with a different network device?

[Deleted User]

feet_up said:

Thanks for the quick and helpful replies. I think I have the wiring ok as RJ45 568, and I used pass through plugs so I got it right and could check  that and because there is continuity I would have to have made the sam mistake twice.

It's Cat 5 and a relatively short run. It worked ok before I changed the ends (which I did because of a corroded plug.)

RJ45 568A or RJ45 568B?

Same standard at both ends?

Does you network tester just do continuity or does it confirm the cable layout matches eg 1=1, 2=2 etc? Just wondering how you know with a pre-installed cable where you can't see both ends at the same time?

feet_up

Thanks again for your help

It’s RJ45 568B and a cable which works with the set up is stamped as such.

My network tester is one where you plug in a unit at each end and one of the units has 8 numbered lights which illuminate sequentially. If a light doesn’t illuminate then you know it’s wrong.

I’d could re-do the plugs to avoid going up the ladder and drilling more holes around the house while the wife is working from home. But I’d do everything the same.

Very frustrating !

Username03725

When I used to make up RJ45 plugs I was told that it's important not to unwind the twisting of each cable pair, at least not beyond that which you have to do to align the cables into the receptacle. The reasoning was to do with the RF interference being negated by the twisted pairs; I don't know if it's right or wrong, but took it at face value and never had any issues.

feet_up

I replaced both plugs and still the same issue. The network tester shows them as connected ok but data does not pass through. As suggested I tried another network device and that didn't work either. To add injury to insult I also cut my finger accomplishing this!!

I am going to have to thread a cable I know works - complete with plugs - through three new drilled holes,large enough for the plugs to go through and thread the cable through the trunking artfully concealed behind the furniture, which I will have to move to get at.

The way I'm going I may fall off the ladder too!

Just a thought but could this be the fault of my cheap crimping tool?

Thanks for your suggestions.

outtatune

You have some pro cables that work. Have you tried them in the cable tester to see if maybe they're wired differently from what you're expecting?

Le_Kirk

feet_up said:

I am going to have to thread a cable I know works - complete with plugs - through three new drilled holes, large enough for the plugs to go through and thread the cable through the trunking artfully concealed behind the furniture, which I will have to move to get at.

The way I'm going I may fall off the ladder too!

How big is your furniture that you need a ladder?