We can tick off any extension problems surely as we're connected directly to the MK3 faceplate via a short DSL cable?
The line to the NTE5/A was only replaced five or so years ago so I don't think it will contain any non-twisted cable?
Not wishing to be provocative but both of your above questions are based on assumptions. How difficult would it be for you to actually check?
You have a
Mk 3 SSFP fitted at the
NTE5/A. As a temporary test, power down the modem, remove the lower front plate of the
NTE5/A to disconnect all extension wiring and connect a wired telephone to the socket so exposed. (The socket in the
SSFP.) Once 30 minutes have elapsed since the time that the modem was powered off, then re-energise it. Harvest a set of snapshot graphs (Bit loading, Hlog, QLN & SNR).
Whilst waiting for the 30 minutes to expire, check that each and every telephone extension socket is not "live". Look to see if there are any long forgotten junction boxes. If your service is an aerial feed then check (with binoculars) that the drop from the pole-top DP to the premises is contiguous. Check where it runs down the exterior of the building for any joins.
You will now
know the condition of the wiring, within and without.
