outcome of incorrectly wired BT jack?

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kornflake

409 posts

Ultimate Geek

#142501 14-Mar-2014 20:58

Apologies for such a short question, however if a BT jack, wired in a daisy chain configuration, was wired incorrectly. Would the dsl and the phone line still work?

InstallerUFB

840 posts

Ultimate Geek

#1005889 14-Mar-2014 21:19

Could they still work - yes

Are they likely to still work properly - No

What exactly do you mean by 'incorrectly'?

webwat

2036 posts

Uber Geek

Trusted

#1005960 14-Mar-2014 23:44

Is it a 2wire BT jack? Will have a "2" on it somewhere. Those ones need one wire to a terminal on each side but doesn't matter which slot as long as its same coloured wire to each side. Check the other jack to find out which slot to put each colour in.

If its a master jack, there are 3 wires connected and it matters which slot they go into. The incoming telecom line goes to the middle slot on each side.

Time to find a new industry!

kornflake

409 posts

Ultimate Geek

#1006078 15-Mar-2014 11:35

the jack has two slots for the blue wire and two slots for the blue/white wire. I wired the incoming pair on 1 and 3 and the "daisy chain" out going pair on 2 and 4. Is this correct? or should the incoming be on the two center slots and the outgoing pair be on the outside side slots?

Yabanize

2350 posts

Uber Geek

#1006081 15-Mar-2014 11:44

webwat: Is it a 2wire BT jack? Will have a "2" on it somewhere. Those ones need one wire to a terminal on each side but doesn't matter which slot as long as its same coloured wire to each side. Check the other jack to find out which slot to put each colour in.

If its a master jack, there are 3 wires connected and it matters which slot they go into. The incoming telecom line goes to the middle slot on each side.

Im pretty sure when I looked in our master jack the other day it only had two pairs connected, (2 wires from the incoming line and 2 wires going to the second jack point)

You think theres supposed to be a third wire? our phone still rings

Although our phone line doesnt use chorus lines, its from TelstraClear/Vodafone Cable but its still POTS

kornflake

409 posts

Ultimate Geek

#1006088 15-Mar-2014 11:57

"the jack has two slots for the blue wire and two slots for the blue/white wire. I wired the incoming pair on 1 and 3 and the "daisy chain" out going pair on 2 and 4. Is this correct? or should the incoming be on the two center slots and the outgoing pair be on the outside side slots?"

Should say the the "coloured wire slots are 1 & 2 and the coloured /white wire slots are 3 & 4. Apologies to leave this out.

InstallerUFB

840 posts

Ultimate Geek

#1006096 15-Mar-2014 12:06

kornflake: the jack has two slots for the blue wire and two slots for the blue/white wire. I wired the incoming pair on 1 and 3 and the "daisy chain" out going pair on 2 and 4. Is this correct? or should the incoming be on the two center slots and the outgoing pair be on the outside side slots?

From your discription I gather you have a PDL BT Jkpt ( the jack point fits into a standard PDL face place and has a small circuit board with 4 slot Krone strip at the back ) if so slots 1+2 are joined togther on the board and slots 3+4 are jointed together. If this is what you have then you have connected it correctly.

Bung

6477 posts

Uber Geek

Subscriber

#1006097 15-Mar-2014 12:08

kornflake: the jack has two slots for the blue wire and two slots for the blue/white wire.

So long as both wires on each side are the same colour it doesn't matter.

The 3rd wire was originally a legacy of bells and decadic diallling. It creates an imbalance that can affect ADSL so shouldbe changed to a 2 wire arrangement.

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InstallerUFB

840 posts

Ultimate Geek

#1006106 15-Mar-2014 12:22

Yabanize:
webwat: Is it a 2wire BT jack? Will have a "2" on it somewhere. Those ones need one wire to a terminal on each side but doesn't matter which slot as long as its same coloured wire to each side. Check the other jack to find out which slot to put each colour in.

If its a master jack, there are 3 wires connected and it matters which slot they go into. The incoming telecom line goes to the middle slot on each side.

Im pretty sure when I looked in our master jack the other day it only had two pairs connected, (2 wires from the incoming line and 2 wires going to the second jack point)

You think theres supposed to be a third wire? our phone still rings Although our phone line doesnt use chorus lines, its from TelstraClear/Vodafone Cable but its still POTS

3 wire jackpoints stopped being used in the 90s/00s and were replaced with 2 wire jackpoints (hence the 2 embosed on the front). As the 3 wire circuitry interfares with xDSL.
Older 3 wire jackpoints (M or E embosed ) can still be used with the 3rd wire removed (normaly the blue - terminal 3) as modern phones have the ringing components in them and dont need ringing passed around.
On a 3 wire jackpoint only slots 2 & 5 are used

Yabanize

2350 posts

Uber Geek

#1006131 15-Mar-2014 13:00

InstallerUFB:
Yabanize:
webwat: Is it a 2wire BT jack? Will have a "2" on it somewhere. Those ones need one wire to a terminal on each side but doesn't matter which slot as long as its same coloured wire to each side. Check the other jack to find out which slot to put each colour in.

If its a master jack, there are 3 wires connected and it matters which slot they go into. The incoming telecom line goes to the middle slot on each side.

Im pretty sure when I looked in our master jack the other day it only had two pairs connected, (2 wires from the incoming line and 2 wires going to the second jack point)

You think theres supposed to be a third wire? our phone still rings Although our phone line doesnt use chorus lines, its from TelstraClear/Vodafone Cable but its still POTS

3 wire jackpoints stopped being used in the 90s/00s and were replaced with 2 wire jackpoints (hence the 2 embosed on the front). As the 3 wire circuitry interfares with xDSL.
Older 3 wire jackpoints (M or E embosed ) can still be used with the 3rd wire removed (normaly the blue - terminal 3) as modern phones have the ringing components in them and dont need ringing passed around.
On a 3 wire jackpoint only slots 2 & 5 are used

Oh cool :) I thought he said master jacks have 3 wires connected but thats obviously the older ones? The master jack does have that capacitor or whatever in it though eh

Or maybe not, it seems both jacks have a yellow thing

Bung

6477 posts

Uber Geek

Subscriber

#1006193 15-Mar-2014 14:14

Master in a 3 wire circuit meant the jack with the capacitor. Early 2 wire jacks all had caps but these are no longer included in current jacks.

webwat

2036 posts

Uber Geek

Trusted

#1006981 17-Mar-2014 00:20

Bung: Master in a 3 wire circuit meant the jack with the capacitor. Early 2 wire jacks all had caps but these are no longer included in current jacks.

So the yellow capacitor is only for older jacks? Did a job today where the test capacitor was installed at the demarc, which I guess is handy for structured cabling (RJ45 jacks) so kept it connected on the phone side of the filter. Is that best practice? I expect it would enable Faults to do a line test without any phones connected.

Time to find a new industry!

Bung

6477 posts

Uber Geek

Subscriber

#1007222 17-Mar-2014 12:50

I have no idea what current policy is. Someone else here has said that the test termination can be left out.

At one time Telecom's line side had a manager from the US that wanted to stop any unnecessary truck rolls so line testing was No1 priority. There was automatic testing going on all the time trying to catch faults before they were reported. I don't think it ever succeeded as the NEAX line tester wasn't great. I think most faultmen wanted to do a site visit regardless.