Phone line polarity hasn't been an issue for 20 years or more.

All approved devices had to be made compatible with either polarity, starting around the touchtone era, well on POTS stuff anyway.

 

I would still use foil on glass if required, you say it's passed it. I'd say it's proven and works well in the right situation.

God, I haven't seen or Installed foil on glass for more years thank care to remember. But your right it's well proven and when Installed properly, does a good job.

It's like batten, tube and lace, not used now but did an excellent job for many years. Jeeze my age is showing, I can still remember the first time I helped install it.

3 hours ago, sixwheeledbeast said:

Phone line polarity hasn't been an issue for 20 years or more.

All approved devices had to be made compatible with either polarity, starting around the touchtone era, well on POTS stuff anyway.

 

I would still use foil on glass if required, you say it's passed it. I'd say it's proven and works well in the right situation.

Agreed but if the foil was no longer available it couldn't be used. I see that old stuff worked well and this is a prime example that it was. But i assume 6 your not using tsi via a modem or a direct leased line etc. Times change and I think pstn for anything is past it least of all something possibly important 

12 hours ago, sixwheeledbeast said:

Phone line polarity hasn't been an issue for 20 years or more.

All approved devices had to be made compatible with either polarity, starting around the touchtone era, well on POTS stuff anyway.

 

I would still use foil on glass if required, you say it's passed it. I'd say it's proven and works well in the right situation.

Yeah all China stuff being made to spec.....

7 hours ago, al-yeti said:

Yeah all China stuff being made to spec.....

It is all made to spec al, it's just nobody knows what spec .

To be fair, I have had some good well made stuff from China in the past. It's not all cheap tat.

Edited May 29, 20196 yr by Specialist

16 hours ago, james.wilson said:

 i assume 6 your not using tsi via a modem or a direct leased line etc. Times change and I think pstn for anything is past it least of all something possibly important 

 

I would argue that's completely different a modem has speed limitations. If a modem could do broadband speeds without having to have the line engaged it may still be in use.

There are a good few companies that still prefer fax for example. The time to be received is similar to an email so it's still fit for purpose.

Must admit I was using a fax machine myself until it packed up a few weeks back & never had any complaints.

I use the test um lil buttie, it has dsl indication and a screen with onboard dtmf decoding, cli, line voltage, line current and polarity indication. tbh though I dont use pstn for intruder alarm signalling but it is still very prevalant in warden call and medical alarm signalling, and the dtmf decode has been very handy on a number of occasions. I bought a few when comtec were having a clearout at around £13+vat

Edited June 1, 20196 yr by petrolhead

Thanks, will check it out. I've got the test-um high power toner & probe kit, that's been a really good bit of kit.

Can't find anywhere in the UK selling them so far, looks a good unit though.