"Dave Plowman" wrote
| I've got phone sockets in every room - two in some - and I didn't
| take particular care when installing the cable. And this
| computer is on the very last socket on the chain. Rather than
| provide filters everywhere, I'd like to put the router in the cellar
| where the line comes in,

Eminently sensible.

| with just the one filter before it, then run Cat5 to both the
| computers up the side of the house. Anything wrong with this plan?

You've got the filter in the wrong place :-) The filter blocks the broadband
signal.

The line needs to be split:



|------ ROUTER ------- PC
| / HUB ------- PC
LINE -----
|
|-------FILTER ------- PHONES


Owain