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There is a facility available on most BT lines and on SKY lines, to test the lines for excess noise in the AUDIO Spectrum; but which if present, of ten affects ADSL and VDSL.
With the simplest, preferably corded phone available to you, plug it in to the Master Socket, also often described as an NTE, Network Terminating Equipment, preferably directly without the usual "dangly" xDSL/Modem Filter.
With recent NTEs, this may involve taking off the top which generally has a built-in equivalent, giving access to the otherwise hidden Test Socket.
Plug the old, simple, corded phone in.
On hearing the Dial Tone, Dial 17070
Assuming you get an answer, select Option 2 on BT or Option 4 on SKY, both described as "Quiet Line Test".
Basically, the line should go very Quiet, with possibly an extremely faint constant hum at most.
Listen for at least 5 repetitions of the QLT announcement, about 1 minute total.
(The SKY one is slightly different but achieves similar results.)
Hopefully your line will be "quiet"/clean.
If you hear "SNAP - CRACKLE - POP" or Engineering Tones etc, report is a PHONE LINE Fault to your PHONE Supplier - ie the Company that you pay PHONE Line Rental and any Call Charges to.
AVOID mentioning Broadband in any shape or form.
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If the Line is quiet, reconnect it back to normal, then try the QLT again from any sockets within your house.
If quiet - good.
If noisy, you need to try to locate the source, as generally it will be either faulty equipment somewhere in your house, or faulty phone or electric wiring or possibly induced from TV sets etc.
This may involve working progressively through any such equipment, switching off and preferably unplugging individual items, until hopefully you find the cause.
As the "noise" is not coming in on the phone line, it is for you to sort it out, although your local computer shop may offer the service, at a cost.
It may seem a nuisance and lengthy procedure - it generally is actually very short, from a few minutes to possibly an hour.
And it is highly advisable to sort such aspects out BEFORE upgrading to VDSL - the much higher frequencies involved are much more affected by such faults.
If you check the BT and SKY Web sites, the QLT is mentioned very early in their fault-finding procedures for Customers.
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