A lot of openreach engineers about due they claim to the old bulk aluminum phone cable from the exchange to the old pcp cabinet causing problems..
I assume that there is a copper wire from the new fibre cabinet to the old pcp cabinet In which case there is a copper aluminum connection which in damp conditions could be problematic
I assume that the copper wire from the pcp cabinet to my house has not been touched.
On FTTC there is a patch panel installed in the PCP and your phone line from the exchange is connected to that.
That patch panel has two copper pairs per user between it and the FTTC cabinet. One pair carries the phone signal between the two cabinets. The other carries the combined signals between them.
At the FTTC cabinet is a DSLAM where the fibre signal from the headend exchange (which may be different from your phone exchange) is converted to VDSL2 and merged with your phone signal, and vice versa on the return journey. Loads of filtering at the FTTC cabinet.
The second copper pair carries that combined signal back to (or from depending on the direction) the PCP and the copper from your house to there is connected to the return port on the patch panel.
There is far less chance of the aluminium causing trouble than there was before you had FTTC on your circuit.
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