Alex@rtnVFRmedia Suffolk UKFeb 25

One (1) #telephone number successfully ported to #VOIP, one more left to go (there's 2 pairs for main and aux line, provisioned on same number but those will go to 3 channel #SIP trunk)

For some reason #Openreach have left battery on the pair (I would have thought they would want to recover capacity on the line card and it would just go dis, as there are still going to be a handful of customers remaining on #PSTN circuits.

I thought a lot of "analogue" trunks these days were literally just a SIP ATA connected to the copper pair at the Telephone Exchange (or from a street cabinet) but it looks like Openreach really are getting the last out of the old #SystemX kit!

There is no dialtone or even NU tone, just some noise..

#Telecoms #Telephony

Show threadA2 Engineering Services
@vfrmedia years ago we used to call it DC wetting - a voltage to indicate the line was in use for something even though no tones could be heard. Mostly used on Private Wires.
Feb 25 at 9:59pmWeb
Show threadAlex@rtnVFRmedia Suffolk UKFeb 26
@a2es there is 61V on the pairs for my office with a newly provided SoGEA circuit, it seems Openreach are still using this (although its strange it appears on the ceased line im the office, as thats not going to be used for anything - unless its there as a marker for the MDF at the Telephone Exchange as a reminder there's a working line card at the other end when they do decide to recover it)
Show threadA2 Engineering ServicesFeb 26
@vfrmedia It is a long time since I have worked in a telephone exchange. It was mostly Strowger and TXE4 back then. Power was supplied by huge rectifiers with large lead-acid batteries floated across them. The battery voltage was 52V, the positive was connected to earth and also the A-leg of the line and the negative was connected to the B-leg. The "wetting" that I mentioned earlier was applied to both legs of the line via a centre tapped transformer, unless the circuit used DC signalling.