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It's been suggested elsewhere that BT is continuously monitoring its local loop by sending test signals to detect faults before they occur. Specifically it was in response to my suggestion that BT might still have only incomplete information on line lengths.
Does openreach have such a system? It would be a surprise to me as I always assumed that openreach only cared about faults when someone actually reported them. If a line has never had some form of DSL on it and never had a fault reported I'd assume BT didn't know how long it was.
Also on the line length - is that based purely on resistance and knowledge (assumed?) of cable thickness or can the test actually time the returned pulses and be 100% sure of length?
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Andrue Cope
Brackley, UK
Edited by Andrue (Mon 16-Oct-17 12:10:36)
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No, but they have mountains of data where individual faults are located and cleared, and will direct work to repair/replace nodes/joints/ cables etc
They also have pressure monitoring systems to detect possible E side cables failing
Edited by witchunt (Mon 16-Oct-17 12:38:18)
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There�s teams working on FVR (Fault Volume Reduction), yes. The work they do is based on reports of underground joints letting in water, obsolete lineplant etc by other engineers.
There are systems that look for faults in underground joints or overhead DPs based on the automated line tests that are performed overnight. These would be faults that are exist but that haven�t been reported by end users. What I don�t know is how those tests tie in to the work that the FVR teams do, as I haven�t done much FVR work.
In answer to your question about line lengths, no the network records systems (I won�t name them) have actual measurements for cables, they aren�t based on resistance. The measurements are up to the DP only, not beyond, and are very accurate.
Edited by deleted (Mon 16-Oct-17 16:36:15)
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Register (or login) on our website and you will not see this ad.
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Most/nearly all FVR work is based on A1024's submitted.
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Ive wondered if Fibre cabs that have fans in them have automatic warning systems to alert OR if a fan fails?
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Faults cost money to fix.
If there is a catastrophic breakdown of a large cable, it costs a lot of time and money to fix. The compo the providers get can mean Openreach won''t make the money spent back in line rental for those circuits for many years.
Hence they analyse network health electrically and pneumatically. As well as reports of plant requiring attention by engineers.
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Top clip there Partial 
That's what the network needs, more Teddy boys and comma vans .....
Not so many months ago that I cleared a fault in a plugs expanding either .
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Not that long ago I found a pressure fault in a 1200pr plugs expanding! They used them on lead to poly joints. Wipe one end, plugs the other/
A clip joint is just a new fangled plugs expanding really.
Edited by deleted (Mon 16-Oct-17 18:33:36)
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Network routining 1968 style.
https://bt.kuluvalley.com/view/P0xeXZtOmyy
+1
I love these old videos
Plus not so long ago (2 - 3 jobs back) we taught you engineers electrical engineering
Paul
Edited by PaulKirby (Mon 16-Oct-17 18:56:00)
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Yes they have fan alarms, environmental , power and communication alarm monitoring, in addition to door access alarms.
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Does that apply to normal non fibre cabs too? (minus the fans as i dont believe they have fans in)
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No, PCPs have nothing
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I love these old videos
Plus not so long ago (2 - 3 jobs back) we taught you engineers electrical engineering
In my day of locating Dside faults you simply kept digging Her Majesties tarmac until you found it. You either got very good at locating faults or you got a lot of hand and back problems. My hands are not great these days.
Edited by deleted (Mon 16-Oct-17 21:56:25)
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I love these old videos
Plus not so long ago (2 - 3 jobs back) we taught you engineers electrical engineering
In my day of locating Dside faults you simply kept digging Her Majesties tarmac until you found it. You either got very good at locating faults or you got a lot of hand and back problems. My hands are not great these days.
I liked the guy in the video look where the marker post was and did the distance steps, "Yep its down there" LOL
Yeah, my joints are very bad these days  and that wasn't a pun.
Paul
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There's no active hardware in a PCP, so nothing to monitor.
 Comms is hard |
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OMG that is just so funny ! So some fool belives all that rubbish and starts to dig a hole without opening a jointing post a few feet away ! Having done track and mark for years that is 100% not how you do it and i dont belive it ever was.And as for the guarding even in the 80's we did not use it in the real world .
Thanks for posting
these comments are my own and in no way represent any company that i may or may not be linked too.
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Top clip there Partial
That's what the network needs, more Teddy boys and comma vans .....
Not so many months ago that I cleared a fault in a plugs expanding either . `
This year i cleared a fault in a lead cable , working on paper prs was fun !
As for the shoes that guy was wearing for digging ! LOL
these comments are my own and in no way represent any company that i may or may not be linked too.
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They were digging out a split coupling. It wasn't a jointing post, it was a marker for the split coupling. The marker indicated how many feet away the coupling was. Hence they stepped it out and dug on it.
Jointing posts did not exist in the 60s.
Every DP pair was connected to a pillar or cabinet. There was no need for joint boxes at the foot of the DP. as there was no need for pair diverts.
Edited by deleted (Tue 17-Oct-17 23:09:42)
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Paper core unit twin was installed up until the mid seventies. Some of it later on was very badly twisted.(I'm looking at you Belfast Cable) as twists add to overall length and copper cost. Indeed unit twin was invented as it is easier to distribute than quad or concentric.
I have worked on 1930s and earlier British quad cables that were beautifully made. And German cables looted from the enemy or gained from war reparations still holding pressure and still giving good service.
The vast majority of the main side is lead or white poly paper core. That is why it is pressurised and why it is catastrophic if the pressure is not pro-actively maintained. It only gets wet once.
Edited by deleted (Tue 17-Oct-17 23:41:03)
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