Rj45 cable plugs and sockets

[nethystevo]

I have just finished wiring a house in cat5e cable and have connected up all the plugs and sockets, but after testing it with the continuity tester it comes up with non-parallel, this happens when the green and orange cores are connected in the socket, but when I take them out it says connected? Really confused with this.

 

[uksparks]

Sounds like you have connected it incorrectly.

 

[nethystevo]

The connections are exactly what's marked onto the socket, this is why I'm struggling to understand why it is not working. I'll triple check my connections but I'm more than positive that they are the right way around.

 

[tazz]

Are you using a network tester, or a multimeter...?

 

[Plonker 3]

What markings does the module have on it, 568a or 568b?

also have you proved the test leads youmare using are working correctly?

 

[Lucien Nunes]

Sounds like one end is connected to 568A and the other to 568B, which are basically similar but have the green and orange pairs in opposite places. Most connectors show pinouts for both so you might have followed the wrong legend compared to the way you have done the plugs.

E: And Dillb is thinking along the same lines

 

[Dcf]

remember there is 2 standards to connect to 586a and 586b
both of these will probably be marked on the outlet
it is very easy to get mixed up if they are both marked up on the outlet

 

[Dcf]

great minds think alike lucien

 

[tazz]

Null crosswork could be the answer, but a network tester would show they null pair

 

[nethystevo]

Right I've just had a thought, I have one end a socket and one end a plug, will this still work? Also I'm using both 568A on both ends.

 

[nethystevo]

this is the tester I'm using.

 

[tazz]

Looks like a null paired there....now which pair 1-8 are either not in sequence or not showing..?

 

[nethystevo]

Im afraid that's all the info this tester gives me that can be seen in the picture,

 

[Plonker 3]

Have you proved you both your test leads by plugging them directly into the tester and recieving unit?

 

[nethystevo]

I've taken a shop bought cable and tested that just incase but it says that cable is fine, would it mater that it's a plug on one end and a socket on the other?

 

[Plonker 3]

You need to prove the cable you are plugging into the ends you have made off

 

[nethystevo]

I'll swap the socket for a plug quickly and test it

 

[Plonker 3]

But the socket needs to be connected up exactly the same as the plug, you may correct the fault without actually realising it by doing that.

 

[nethystevo]

I have the socket connected up in the "a" terminals but I have already tried it in the "b" as well.

 

[tazz]

ok first thing, prove your test cables, plug test rj45 cable in transmitter and receiver and hopefully all should show connected. if all ok then move on to your installation, remove pairs one at a time until connected shows, but 2 pair numbers do not lite....swop the non lite pairs, to hopefully show connect.

 

[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