Single cored wiring

Hi.

I have rather a strange problem, My SNR is actively dropping, over the last 7 months as a result, my synch rate has also been dropping, I am now down to 4.5mb from 6mb
I have done everything I can on my side of the wiring, i bought a XTE-2005 Master Faceplate, I also bought a Belkin F3L900-15-ICE-S RJ11 cable, but still my SNR is dropping.

Ring line is disconnected, tried different three different routers, all same result.

I then look at the wiring to the master socket, it is the really old single core 0.4m wiring, as can be seen in this pic on the right hand side http://www.telephonesuk.co.uk/images/52a.jpg
The master socket itself is a basic BT single socket box.

Could that be the cause of my steadily decreasing SNR, if so, do you think BT would replace this wiring if asked?

Please ignore me, I used to be a software engineer. To me that looks like excellent wiring. How could it be changed to be better?

I mean the actual wires, not the wiring job.

The wires involved are around thirty years old.

Maybe see post same forum entitled re bT Master socket i posted a link on my post maybe you could look there.

Looks to me like you have a reasonable speed. The fact that the wiring is 30 years old is neither here nor there. The only concern I would have is whether the A and B wires are being carried over a pair, or whether they are split between pairs. As for your SNR, expect it to fluctuate, and post your line stats if you want informad comment.

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I mean the actual wires, not the wiring job.

The wires involved are around thirty years old.

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Copper doesn't age (fortunately for BT !). The PVC insulation can break down, but BT use such generous specifications this is very unlikely too.

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The only concern I would have is whether the A and B wires are being carried over a pair, or whether they are split between pairs.

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Never heard that before. Do you mean that A&B can sometimes be split across twisted pairs all the way back to the exchange? Very bad for crosstalk.

The large bundles I have seen in the ducts don't appear to contain twisted pairs. I believe you only get that the with newish drop wires.

The cables are made of individual pairs of wires which are twistd along their length. Multiple pairs are then twisted together to form the cable.
Only twisted pair cable is used now, all the way between exchange and customer.
A split pair is where one wire from 2 different pairs are used to make a circuit, which is bad news .

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A split pair is where one wire from 2 different pairs are used to make a circuit, which is bad news .

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...and is a very rare fault.

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The cables are made of individual pairs of wires which are twistd along their length. Multiple pairs are then twisted together to form the cable.
Only twisted pair cable is used now, all the way between exchange and customer.

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Is this true with old wiring though? Perhaps bundles that existed before ADSL?

The comms cables I look after at work are now getting upto 100 years old in places and are twisted pair. The basis of telephony requires that there be some twist involved in the pairs to remove crosstalk etc.

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Do you mean that A&B can sometimes be split across twisted pairs all the way back to the exchange?

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No, I am thinking that this is something the OP might want to check in his own wiring. even with an extension, it may be bad news.

Yep. Even the old lead and paper stuff is twisted pairs.

The 150 metres recently replaced from the road to my final drop is not twisted pair but two wires in parallel. I believe it is mild steel copper coated.

It was manually twisted on install

So BT are twisting its customers?

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So BT are twisting its customers?

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No, just employing people to screw up their kit.