1) Central 2) Exchange 3) Patchboard 4) Plugboard 5) Telephone exchange 6) Telephone installation 1) Panel 2) Patchboard 3) Plugboard 
(from the article `telephone and telephone system`) ...wires between all the instruments. In 1878 the first telephone exchange was installed in New Haven, Conn., permitting up to 21 customers to reach ...
part of a manual or manually supervised exchange at which the interconnection of circuits is manually controlled
[n] - telephone central where circuits are completed with patchcords
Console from which the lighting is controlled.
patchboard noun telephone central where circuits are completed with patchcords
a structural unit on which are mounted switches and instruments necessary to complete telephone circuits manually. · Also calleda panel of switches, dimmers, etc., for controlling the lighting on a stage or in an auditorium.