|
Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
|
Thread Tools |
6th Mar 2016, 2:12 am | #1 |
Retired Dormant Member
Join Date: Feb 2016
Location: Coventry, West Midlands, UK.
Posts: 13
|
Extension Cable Damaged
Apologies in advance as the question concerns a modern problem which I'm hoping that somebody can kindly advise upon.
In short, I've snapped the extension cable which connects the main BT socket box in the hallway with an extension socket upstairs. I haven't a clue how to reconnect the wiring, but do have an additional socket. Can I use this to bridge the connection by connecting the two half one how? Many thanks. |
6th Mar 2016, 3:22 am | #2 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
|
Re: Extension Cable Damaged
|
6th Mar 2016, 1:10 pm | #3 |
Rest in Peace
Join Date: Apr 2012
Location: West London, UK.
Posts: 665
|
Re: Extension Cable Damaged
Hi Earl, check the existing connections.
Generally 4 same pin to pin connections are made, although 6 are available. However only 3 or sometimes 2 (ring signal depending on phone) are used:- 1 not used 2 to 2 3 to 3 4 to 4 5 to 5 6 not used You need check the spare box you have is a Slave (missing few Components) and not a Master (has Components). Look in existing boxes and you should see what I mean. Instead of Bill's link, I think it better explained / illustrated here:- http://www.wppltd.demon.co.uk/WPP/Wi...telephone.html Regards - Mike |
6th Mar 2016, 7:05 pm | #4 |
Rest in Peace
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
|
Re: Extension Cable Damaged
A neat solution is to use a 6-way junction box, can't remember the BT number off hand but they should be available from DIY outlets etc. They are small so unobtrusive but you may not have enough spare cable at the break to reach the terminal. If that's the case you could use two junction boxes with a bit of 6-way cable between the two. You should be ok just joining colour for colour in the cable.
Alan. |
6th Mar 2016, 9:05 pm | #5 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
|
Re: Extension Cable Damaged
I would have thought you would only need four-way cable between your two junction boxes - leaving two terminals in each box unused.
__________________
Mending is better than Ending (cf Brave New World by Aldous Huxley) |
6th Mar 2016, 9:12 pm | #6 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
|
Re: Extension Cable Damaged
I've only ever done extensions in 2-wire.
The third 'bell' wire's a legacy and not needed for any phone made since about 1980 - indeed, it can cause significant signal/throughput issues when you want to run an ADSL connection from the extension-outlet. |
6th Mar 2016, 10:51 pm | #7 | |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
|
Re: Extension Cable Damaged
Quote:
In essence, as has been said, you only need three wires for an extension. Simply open the socketc before and after the break and note the colours of the wires on terminals 2,3,5 and connect these three through. Try extension after join for dial tone and then ring house phone from mobile. No ring- check the EXACT colour markings on the wire on terminal 3, and that you have not crossed the wire colours on terminals 2 & 5. If the wires are not long enough to connect through using one box, it might be neater and cheaper ,to buy just one box and a metre of 6w telephone cable and terminate one end on terminals 1,2,3, and the others on 4/5/6, and use individual wires from the metre of cable to bridge the corresponding colours. ( e.g., if you put white/blue on terminals 1 & 6, then use same colour to connect these terminals together. |
|
7th Mar 2016, 12:26 am | #8 |
Retired Dormant Member
Join Date: Feb 2016
Location: Coventry, West Midlands, UK.
Posts: 13
|
Re: Extension Cable Damaged
Thanks for the replies, much appreciated.
The socket that I have is the one shown. Do I connect one half of the wiring into terminals 1,2 and 3 with the other half being connected to 4,5 and 6? Many thanks, Chris |
7th Mar 2016, 12:39 am | #9 | |
Heptode
Join Date: Aug 2009
Location: Liverpool, Merseyside, UK.
Posts: 705
|
Re: Extension Cable Damaged
Quote:
Cheers, Kev |
|
7th Mar 2016, 11:47 am | #10 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
|
Re: Extension Cable Damaged
Quote:
BT's 87XX series of phones weren't produced until after 1980 and many were made new after that date. Also 'approved' privately produced after 1980 phones also required the third 'bell' wire until long after then. It was a common problem with wiring used with phones made well after 1980 - I spent many years after 1980 maintaining phones/systems. The 'two wire' phones around c1980 were the 'unapproved' ones sold by the likes of Tandy and usually brought in from the USA/Far East. Often caused 'bell tinkle when used with pulse dialling. Hence the reason for the third 'bell' wire from 3 to 3 between the master socket and subsequent sockets. In recent years, with the virtual disappearance of pulse dialling phones, the bell tinkle problem has disappeared. As most ADSL filters have the capacitor to 'filter off' the bell wire incorporated within, it is possible to use just two wires. See http://www.sinet.bt.com/sinet/SINs/pdf/351v4p6.pdf for the 'official' BT way. |
|
7th Mar 2016, 12:57 pm | #11 | |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,846
|
Re: Extension Cable Damaged
Quote:
|
|
8th Mar 2016, 12:14 am | #12 | |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
|
Re: Extension Cable Damaged
Quote:
My advice was based on the idea that you may have problems with length of wires. So connect one side to terminals 1/2/3 , and the other side to 4/5/6, and use single cores from the metre length to connect LIKE colours to each other. |
|
8th Mar 2016, 4:49 pm | #13 |
Retired Dormant Member
Join Date: Feb 2016
Location: Coventry, West Midlands, UK.
Posts: 13
|
Re: Extension Cable Damaged
Many thanks for the replies
|