D side (UK telephone cabling)

D-Side is the telephone cabling which is connected from the BT Primary Connection Point (PCP) telecoms cabinet to a point close to a residence or business known as the "Distribution Point" (DP) and consists of multiple pairs of copper wires. It may pass through a BT Secondary Connection Point (SCP) telecoms cabinet, sometimes known as pillars, en route to the DP(s).

In the event of a broadband or phone line problem, replacing the D-Side line pair is one potential correction that might be made.

D-Side is a shortening of the term "distribution side" of the telephone network. Conversely E-side is the "exchange side" of the telephone network between the cabinet and the telephone exchange.