BT Cat 3 to Cat5 ?

[NICETOBNICE]

Hi' I have been wondering for a while if I can improve my home plug s***ds which are pretty slow at the moment. if I could run a cable form the downstairs router to a upstairs router my problem would be resolved, but unfortunately I cannot. So I was wondering if I could use the existing bt telephone line that already runs across the house ' I have heard that you can get 10mbps which is better than what I get with a homeplug, has anyone had any experience with this ? I do have all the plugs to achieve this but don't know what configuration I would need ?

[NICETOBNICE]

OK guys been looking into this a little more

I now know that I can do this and expect to receive 10BASE-T.
my problem is I'm not sure what the pin-outs on my bt plug to rj45 should be

i have 2 options
1 to use cat5 cable and cut off wire not to be used
2 use bt line 4 core

all i want to do is plug into the existing socket on the wall ?
can anyone help ?