Does VM suffer from subsidence issues?
 

Someone who used to work on a cable system in the past has told me this:

'To be honest, the overhead one was far better - as the underground one suffered from subsidence, with the entire estate slowly sliding further down the hill - pulling wall boxes off houses and dragging them under ground, and even snapping cables.'

Does the modern system have the same problem? You'd think it would, but i've never heard of any incidents.

He also said that their system used 60 to 65V (said to be the same as the UK telephone system) Is this enough to give you a bad electric shock? What does the modern day VM system use?

Re: Does VM suffer from subsidence issues?
 

In my 12 years in the industry, working on a predominantly underground network (eg distribution tabs underground not just cables) I’ve never heard of a network subsiding and taking down wall boxes cabinets etc. There are cases where ducts etc have collapsed for various reasons, but not just due to being underground. The telephone network runs on 48v DC, and the HFC network is 60v AC, but the AC the will not be passing through customer drop cables, only down trunk coax to power amplifiers. The FTTP network is completely passive after the hub cabinet in the street

Re: Does VM suffer from subsidence issues?
 

The problem there is the other way around by the sounds of it - the estate has the problem causing issues with the ducts and underground infrastructure. They probably had the same issues with any other utilities such as water or electricity.

Re: Does VM suffer from subsidence issues?
 

Yes, it was the estate that was subsiding. I should have been more clear.

Re: Does VM suffer from subsidence issues?
 

I think you've answered your own question

Re: Does VM suffer from subsidence issues?
 

The UK Telephone system works on 50v DC (at least the BT exchanges do, I would think VM are the same).

Re: Does VM suffer from subsidence issues?
 

No it’s not. Most of the cable kit works at 48v, and some of the older Nokia kit works as low as 37v, which is why some customers with older phones used to have issues switching to cable when it first came out in the UK.

Re: Does VM suffer from subsidence issues?
 

How so?

---------- Post added at 12:34 ---------- Previous post was at 12:32 ----------

Would these voltages be enough to give you a shock? Could they be dangerous?

---------- Post added at 12:35 ---------- Previous post was at 12:34 ----------

Passive??

Re: Does VM suffer from subsidence issues?
 

This so

---------- Post added at 16:41 ---------- Previous post was at 16:37 ----------

The VMT1 Cab receives the light from H/E, there is power in this cab and once the optical light leaves this cab to feed the L3 Nodes and L4 Distribution cabs there is no power at all involved, so is called,"Passive"

Re: Does VM suffer from subsidence issues?
 

If it's the estate that 's subsiding then everything on the estate will presumably subside, not just the telecomms infrastructure.

Re: Does VM suffer from subsidence issues?
 

Yes exactly

Re: Does VM suffer from subsidence issues?
 

Rather obvious to everyone except Richard.

Re: Does VM suffer from subsidence issues?
 

Away with your rudeness.

Thank you to everyone else. Are there any cases where this affects Virgin Media infrastructure?

Re: Does VM suffer from subsidence issues?
 

See post 2

Re: Does VM suffer from subsidence issues?
 

If the whole estate was subsiding Virgin cables would be the least of my worries.. I incidentally live on a hill so if my house started subsiding so would Gas & Water mains making it very dangerous indeed.