Telephone Lines !

[IAmSparkytus!]

Evening all,

Need some telephone line advice - probably extremely simple...

Is there a tool you can buy (other than an actual telephone) which you can plug into your incoming telephone lines to see if its wired correctly and getting a dial tone? (Similar to an RJ45 tester with the 8 green indicators used to test 2 ends of a cable).

Can a main BT telephone socket with A and B terminals be replaced with a master socket if terminals 2 and 5 are used instead?

Cheers!

 

[buzzlightyear]

This often has Orange, White, Green and Black wires. Usually (but not always) Orange and White are the active pair and go to connections 2 and 5. In some master boxes (such as the type with a removable front section) they go to two connectors marked A and B.

 

[buzzlightyear]

Can a main BT telephone socket with A and B terminals be replaced with a master socket if terminals 2 and 5 are used instead?

Can a main BT telephone socket with A and B terminals be replaced with a master socket if terminals 2 and 5 are used instead

Orange and White are the active pair and go to connections 2 and 5. In some master boxes (such as the type with a removable front section) they go to two connectors marked A and B.

 

[7029 dave]

Like this.

 

[littlespark]

I thought it was blue to 2???

never mind

I keep an old wired telephone handset in the van for testing if I wire in an extension. Needing it less and less these days

 

[Lucien Nunes]

If you have 48-50V DC between the line pair (2 & 5) as measured with a voltmeter, unless there is a high-resistance connection it will probably work. Once you've got that far, the best test device is a phone and 17070 to test speech quality, ringing and insulation. There are special linesman's test telephones aka butt sets, but you don't need one of those to prove a line is working.

The NTE5 linebox differs from a master socket (LJU) in having terminals suitable for connecting a dropwire (rather than IDCs) on the line side, a removable panel for disconnecting the secondary sockets, and a filter on the bell wire (pin 3). Historically, master LJUs were used for the same purpose - note that a line master LJU has the surge arrestor but a PABX master does not.

 

[IAmSparkytus!]

If you have 48-50V DC between the line pair (2 & 5) as measured with a voltmeter, unless there is a high-resistance connection it will probably work. Once you've got that far, the best test device is a phone and 17070 to test speech quality, ringing and insulation. There are special linesman's test telephones aka butt sets, but you don't need one of those to prove a line is working.

The NTE5 linebox differs from a master socket (LJU) in having terminals suitable for connecting a dropwire (rather than IDCs) on the line side, a removable panel for disconnecting the secondary sockets, and a filter on the bell wire (pin 3). Historically, master LJUs were used for the same purpose - note that a line master LJU has the surge arrestor but a PABX master does not.

If you have 48-50V DC between the line pair (2 & 5) as measured with a voltmeter, unless there is a high-resistance connection it will probably work. Once you've got that far, the best test device is a phone and 17070 to test speech quality, ringing and insulation. There are special linesman's test telephones aka butt sets, but you don't need one of those to prove a line is working.

The NTE5 linebox differs from a master socket (LJU) in having terminals suitable for connecting a dropwire (rather than IDCs) on the line side, a removable panel for disconnecting the secondary sockets, and a filter on the bell wire (pin 3). Historically, master LJUs were used for the same purpose - note that a line master LJU has the surge arrestor but a PABX master does not.

Morning all,

Thanks for the replies.

My reason for posting was because I've got a ATM requiring a phone line with its existing BT master socket missing the front faceplate.
I was therefore going to replace it with a new point but didnt know if the new point would need A and B connections like the original or if I can connect the incoming line directly into terminals 2 and 5 on a point which doesn't have A and B terminals . Still unsure whether this will work but I assume it will?

 

[snowhead]

It's B.T's line and B.T.'s socket.
You need them to fix the socket and test the line or rather the Owner /Tennant of the property needs to get B.T in.

 

[IAmSparkytus!]

But when the problem could be solved at the expense of a couple of quid and a couple of punch down tool presses for a customer who has invested a lot more than that, I would like to get it sorted for him if possible without having to involve BT who will more than likely send someone to take a look, send someone else to go get the parts, and then send someone else to fit them!

 

[littlespark]

The bt master socket is BT’s property.... their responsibility.

they shouldn’t charge the customer for a repair. Unless, say, someone else has been tampering with the equipment

 

[IAmSparkytus!]

I wouldn't have thought a missing front plate would be classed as a repair though would it?

I'd guess they would more than likely send a cost for attendance and parts when the engineer reports back.

Would no doubt be cheaper and quicker for me to do it while on-site if possible. Just need to know if I would need a like for like replacement and use the same terminals!

 

[buzzlightyear]

I'd guess they would more than likely send a cost for attendance and parts when the engineer reports back.

Is the front damaged, and if saw buy a new box and front, the new bt boxes you don't need a punch down tool order one from amazon. 2019 box

 

[IAmSparkytus!]

Is the front damaged, and if saw buy a new box and front, the new bt boxes you don't need a punch down tool order one from amazon. 2019 box

No, not damaged just missing so doesnt look the best in a new shop!

Can connections 2 and 5 not be used on a standard master telephone socket rather than buying a BT one?

Cheers.