What does the first line of http://www.dslchecker.bt.com/adsl/adslchecker.welcome
It should be something like: Telephone Number 01aaannnnnn on Exchange XXXXXXXX is served by Cabinet 7
Does it give a cabinet number?
No, you will not need a new line from house to cabinet.
Speed: Assuming the checker gives a cabinet number then it will be dependent on the actual cable route from house to original PCP to new FTTC cabinet. If you can make a reasonable guess at the route following poles or manholes it is easier to give a ball park figure. As a guide: 200m total, will usually give a max attainable significantly over 80Mbps, and thus a sync of just under 80Mbps at around 400m the max attainable will drop to around 80Mbps with a similar sync speed. Obviously factors such as noise both atmospheric and man made will affect the speed, similarly proximity of radio transmitters, electric motors or generators (as a line passes a factory), wire gauge, aluminium or copper, your internal wiring, ...
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