Rj45 cable plugs and sockets

[nethystevo]

I'll take this further step by step tomorrow, but for tonight I have put plugs onto the cable and have enough length to reach the appliance, thanks for the quick replies though guys. Much appreciated.

 

[shanky887614]

does you tester cycle tthrough the cores 1 at a time to check if you got the order right?

 

[Adam W]

I'm no expert and I don't know any fancy expressions, but if you wire 2 plugs on either end of a bit of CAT5 in exactly the same way they'll cross over.
Imagine the numbers as the pin numbers and the dashed lines as the cores:

1 ------------ 1
2 ------------ 2
3 ------------ 3
4 ------------ 4
5 ------------ 5
6 ------------ 6

That's what the connections should look like so you can connect more than one lead together and the pin numbers will stay aligned.
If you look at the 'diagram' from one angle with the numbers at the top as if you were wiring that plug, then look at it with the other set of numbers at the top, you'll notice the numbers are the other way around.

Apologies for the simplistic explanation but in my limited experience I've come across this problem before; thinking about it in this way makes sense in my head. :stuart:

 

[shanky887614]

I'm no expert and I don't know any fancy expressions, but if you wire 2 plugs on either end of a bit of CAT5 in exactly the same way they'll cross over.
Imagine the numbers as the pin numbers and the dashed lines as the cores:

1 ------------ 1
2 ------------ 2
3 ------------ 3
4 ------------ 4
5 ------------ 5
6 ------------ 6

That's what the connections should look like so you can connect more than one lead together and the pin numbers will stay aligned.
If you look at the 'diagram' from one angle with the numbers at the top as if you were wiring that plug, then look at it with the other set of numbers at the top, you'll notice the numbers are the other way around.

Apologies for the simplistic explanation but in my limited experience I've come across this problem before; thinking about it in this way makes sense in my head. :stuart:

i wouldnt be suprised if it is a white in the wrong spot, depending on the light it can be tricky

 

[MisterE]

I'd never recommend fitting plugs, too fiddly and easy to get wrong, also although the continuity may be correct the cable may suffer from crosstalk or interference, something a basic tester won't pick up.
Installations with these problems may appear to work but will suffer from poor performance.
With pre-made patch leads cheap (especially compared to the cost of your time to fault find) it's best (in my opinion) to fit sockets at both ends and use patch leads.

 

[UNG]

I'm thinking he has connected the socket and plug reversed so

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

Not familiar with the tester being used but assume it is indicating 4 non parallel or incorrectly connected pairs

 

[shanky887614]

I'd never recommend fitting plugs, too fiddly and easy to get wrong, also although the continuity may be correct the cable may suffer from crosstalk or interference, something a basic tester won't pick up.
Installations with these problems may appear to work but will suffer from poor performance.
With pre-made patch leads cheap (especially compared to the cost of your time to fault find) it's best (in my opinion) to fit sockets at both ends and use patch leads.

you say that but in some cases you need to make the ends, patch leads are different and are easier bought and connected though.

for example when a cat5/6 network is used in a control panel it uses an rj45 connector.

 

[shanky887614]

I'm thinking he has connected the socket and plug reversed so

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

Not familiar with the tester being used but assume it is indicating 4 non parallel or incorrectly connected pairs

the simple ones from screwfix work very well because it has two parts and it sends a signal down each core seperately and in order so you just wath each end to make sure it follows sequence (bassically and sender and reciecer unit)

 

[Barry White]

I bought on of these cheap chinese gadgets off ebay for testing it has a remote unit and tests each core individually in order so will pick up broken cores and crossovers (obviously not a profesional tester but serves me well)

Network LAN Kit RJ45 CAT5E RJ11 PC Cable Tester Crimping Crimper Punch Down Tool | eBay

and under £6 with a crimping tool etc delivered in a few days from uk and looks suprising like the screwfix model