Thank you for your reply, but i was asking can telephone and 100Tbase network be run in same cat5e cable.
I know the Ethernet only uses 2 pairs, i wondered whether i could put the BT telephone through the other pairs.
I have an outlet plate which has a telephone and a Rj45 socket on it.
This would give me separate telephone and internet.
Sorry if i wasn't clear, im new to this.