No dial tone, but....
... I'm looking for some advice/suggestions.
This problem is relatively new and starts by developing an intermittently noisy line
However, I find that it doesn't appear to affect the broadband greatly (though the CRC error rate increases markedly during the noisy time), even though it would be impossible to hold a conversion. At some point one phone (DECT) will have continuous noise and a corded phone will appear to be disconnected (no noise!). Anyone calling gets an instant 1571 message implying "phone in use", even when the phones are on-hook. Unplugging the filtered faceplate and re-inserting after a short delay has no effect, nor does unplugging the DECT phone from the extension, but disconnecting the extension wiring to the DECT phone at the filter resolves the problem. However, after a gap of a few days, reconnecting the extension allowed normal operation for around 3 weeks before the problem re-appeared.
The only odd item is an IDC coupler temporarily joining two CW1308 cables to form this extension wiring, but bear in mind the noise is maintained when there is no electrical load (phone) at the far end of the cables and across a filter unplug/re-plug whilst no phone is connected.
Whilst writing this, I began to think that the coupler may be the problem (it is above the ceiling, so not handy for checking) as it is for CAT5e low voltage cables with traces close together - possible insulation breakdown and recovery - but that doesn't explain why the corded phone is silent when the continuous noise is present with the DECT phone
This problem is relatively new and starts by developing an intermittently noisy line
However, I find that it doesn't appear to affect the broadband greatly (though the CRC error rate increases markedly during the noisy time), even though it would be impossible to hold a conversion. At some point one phone (DECT) will have continuous noise and a corded phone will appear to be disconnected (no noise!). Anyone calling gets an instant 1571 message implying "phone in use", even when the phones are on-hook. Unplugging the filtered faceplate and re-inserting after a short delay has no effect, nor does unplugging the DECT phone from the extension, but disconnecting the extension wiring to the DECT phone at the filter resolves the problem. However, after a gap of a few days, reconnecting the extension allowed normal operation for around 3 weeks before the problem re-appeared.The only odd item is an IDC coupler temporarily joining two CW1308 cables to form this extension wiring, but bear in mind the noise is maintained when there is no electrical load (phone) at the far end of the cables and across a filter unplug/re-plug whilst no phone is connected.
Whilst writing this, I began to think that the coupler may be the problem (it is above the ceiling, so not handy for checking) as it is for CAT5e low voltage cables with traces close together - possible insulation breakdown and recovery - but that doesn't explain why the corded phone is silent when the continuous noise is present with the DECT phone
