BT Line Test Phone?

[BigSi]

Hi all.

I was hoping somebody on here might know a little about a BT test unit that I recently purchased. From what I can gather it’s a Commtel T-328 275A MK.4 BT phone line tester. To be honest, I don’t think that’s it’s ever been used due to the condition of the unit and leads (still in bag and tie wrapped). Despite many hours searching on-line, I haven’t found anything about it (or even any pictures).


If anybody could enlighten me on this, I would be most grateful.



Many thanks, Simon.

 

[Schneker]

Out of interest why did you buy it if you don't know anything about it?

 

[Deleted member 72666]

I think those became obsolete when the 'engineers' started asking you to whistle down the line.

 

[BigSi]

It only cost £12, and was more out of curiosity than anything else!

 

[UKMeterman]

I would suggest registering on google groups and asking here https://groups.google.com/forum/#!forum/uk.telecom

 

[UKMeterman]

Hi,
I found BT Tester 275A Mk 4 - UK Vintage Radio Repair and Restoration Discussion Forum

It is for testing PCM voice circuits, not much good unless you have the exchange to go with it...

 

[alanl]

Google Groups is just a web interface for 'Usenet' groups, and a poor one at that.
If someone were to post to uk.telecom, it'd be far easier to just use a free News server, and have a free downloaded reader on their computer.(I dont think uk.telecom will help with that tester)
You'll have to register to get access to a newsserver (or, maybe your ISP still provides one?), but once that is done, you have acces to all of Usenet, without the very poor Google interface.

 

[shanky887614]

Google Groups is just a web interface for 'Usenet' groups, and a poor one at that.
If someone were to post to uk.telecom, it'd be far easier to just use a free News server, and have a free downloaded reader on their computer.(I dont think uk.telecom will help with that tester)
You'll have to register to get access to a newsserver (or, maybe your ISP still provides one?), but once that is done, you have acces to all of Usenet, without the very poor Google interface.

does anyone still use newsgroups?

 

[Lucien Nunes]

This unit is for use inside a phone exchange. That is why it takes a -50V supply and has indications for P-wire status (the third signalling wire that follows a trunk through the switching train). You can seize and busy a circuit, monitor it over a 4-wire connection etc. I am not sure what use it would be on the end of a phone line - there were different types of testers for that. I probably have tech bumf on this one somewhere though.

 

[BigSi]

Hi,
I found BT Tester 275A Mk 4 - UK Vintage Radio Repair and Restoration Discussion Forum

It is for testing PCM voice circuits, not much good unless you have the exchange to go with it...

I did find that site, but wasn't much info on it.

 

[BigSi]

It only cost £12, and was more out of curiosity than anything else!

It also had a RED BUTTON!!!!!

 

[egg67]

Do not push the BIG RED BUTON you might start a war, as we all know telephones are the devils work and it's better to talk face to face