I want to know about bad phone wiring!

dom · 2011-02-11T14:39:00+00:00

First off - I reckon there is no better place than this to get honestdescriptions of what kind of poor-quality phone wiring installationsthere are around the country than asking about it here!Second off - I need to be upfront and say this is about my day job -and not diy phone wiring.Basically, I'm going to be testing some prototype high speed (200Mbps)modems, and as well as test rigs that match up to standard modernpractice - I also want to build a rig that reflects poor but all-too-common wiring too.I'm particularly thinking about Victorian blocks of flats (like Londontenements) that were never built with wiring in mind. So the phonewiring to the flats might be drop wires bunched together, with moreand more of them added ad-hoc as more phones were connected.Even more so if the ad-hoc wiring happens to be crammed together withmains wiring (although wiring regs says in shouldn't be!)If you can spare a couple of minutes to tell me about it (particularlyif you know the wiring layout around the building) - I'm reallyinterested!The only other way I can find out is to peer around blocks of flats,tracing wiring, making sketches and getting arrested. I'd be verygrateful if you told me about it instead!-----------Explanation for those that want to know what's going on:FYI - these are high speed modems that use the existing copper wirefrom your house/flat to the pole (or whatever - the place known as theCN - convergence node), where there's another box - followed bybonding of lines back to exchange/central office).Hence the wiring length in original copper is usually less than 100m,hence it can support much greater speeds - provided that it doesn'tpick up masses of electrical noise.For those not familiar with how this stuff works - phone drop wiresconsist of a number of twisted pairs - i.e. two insulated wirestwisted around each other into a spiral, before being laid next to theothers and the outer cable jacket applied. This improves the noiseimmunity of the wiring because...

Feb 11, 2011 20 Replies

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Dave Liquorice 15 years ago

Be aware that wires conduct in both directions. B-) Induced s*it on the house wiring *will* get back to your box.

Will the incoming line be providing POTS and data service, like broadband is provisioned now (POTS and ADSL on the same pair) or will the POTS sevice be derived in the box and use a little bit of the data service on the line?

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I want to know about bad phone wiring!

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