I will do my best to explain the internal side...
BT incoming pair to rear of LJ2/1A - nothing plugged in the front of it.
Cat5e blue pair from rear of LJ2/1A to NTE5 input connector.
NTE5 has MK3 fitted - nothing plugged into the front of it.
Cat5e blue pair from MK3 A/B connector to upstairs RJ45 outlet - modem connected here.
Cat5e blue pair from MK3 2/5 connector to living room double-outlet extension - cordless phone and sky box
Cat5e blue pair from living room double-outlet extension to kitchen single-outlet extension - corded phone
There are no ring-wire connections at any point, and nothing else is connected prior to the NTE5 test socket.
Edited by davepusey (Sat 08-Oct-16 15:16:16)