Fibre has recently come to my area but I'm not close enough to he cabinet to benefit. I have started to notice though that since its been available my connection has begun to deteriorate somewhat. More drop outs, slower speed and higher ping.
Could this be coincidence or related? I'm still on your standard ADSL Max
Yes it can have a negative effect on ADSL connections. I'd imagine the biggest problem would be crosstalk as all lines are in close proximity in the cabinet and ducts.
The other often overlooked effect that FTTC can have on ADSL (Indirectly) is that engineers have to mess around re-patching cables in the old cabinet for every new customer (Connecting them to the new cables going into the new cabinet).
Many cables are very old and sometimes even the slightest touch can alter the connection parameters for any DSL connection if the cable is poor/brittle.
So yes it can have a negative impact on ADSL both directly and indirectly.
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A.K.A: Chrisszzyy
Telewest (2004-2006): 256Kbps -> 512Kbps
University of Portsmouth's Horrible Network (2013 - 2014) - Supposedly 100/100Mbps
BT (2006 - Present): 8128/448 -> 22494/1211 -> 79987/20000Kbps (BT Infinity 2 on Huawei Cab)