Dear Sir,
Are engineers have come back to inform us that the DSL frequencies are
poor on the line which is causing the issue with you not being able to
get speeds higher than 5.5mb on the line. Unfortunately the when BT
run a line test they will only check the PSTN (voice) frequencies of
the line and not the DSL. The engineer believes the cause of this is
likely to the be the internal wiring. As from the notes I can see you
have already tried going into the master socket with all other devices
unplugged and also trying different filters. This is likely to be the
best speed we will be able to get out of the line as problems with
internal wiring are not something we can provide help with. This would
need to be arranged with BT who will probely charge to get the wiring
checked out.
Kind Regards
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