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Around 1979, Post Office Telephones introduced thePlug and Socket (PST)method of connection. This document explains how to convert many old British telephone instruments to PST working. The following information assumes that a standard new plan BT line cord (light grey, flat plastic (ridge on one...
10.2 Using d test telephone on an extension which is terminated at the distribution point, seize each connect circuit in turn by taking the test telephone 'off hook' and ascertain that dial tone is received. The first connect circuit to be seized is the top circuit on the first ASU in car...