12 or 25-line
These magneto switchboards are suitable for organisations requiring either 12 lines and 5 connecting circuits or 25 lines and 7 connecting circuits.
The 12-line switchboard (shown right) has a sloping panel giving excellent visibility for operation. The French-grey switchboard cover is a one-piece moulding of a durable copolymer plastic. It drops easily into position and is firmly retained by its leading edge beneath the front of the elephant-grey face panel, and by two screws in the rear of the baseplate. Removal of the cover exposes a 3-section chassis which can be opened book-fashion to permit inspection of wiring and components. Each vertical row of keys is removable as a unit. The appearance of the switch- board is enhanced by the elephant- grey handset and by indicators which display a green number against a white background when operated.
The 25-line switchboard (shown right) makes full use of lightweight
structural materials in conjunction with miniature keys and indicators. The basis of
construction is a light but rigid welded steel frame surmounting a hardwood base. The case
is formed of replaceable plastic laminated panels, the top and back being a one-piece
wrap-over, giving easy access to rear equipment on the release of three captive screws.
The key panel, tilted for optimum display of operated keys and indicators, can be swung
down to provide full access to internal wiring. Each vertical row of keys is removable as
a unit for springset inspection.
The board is attractively coloured; the equipment panel, covered with grained, dove-grey p.v.c. above the black bottom strip and base, tones well with the buff side and rear panels, which are outlined by bronzed metal strips. Black indicators and a black handset and coiled cord complete the overall visual effect.
Two 3V batteries, one for the operator's telephone circuit and one for the audible alarm circuit, are required. They are supplied only when specially ordered. When a transistor ringing unit is fitted, the audible alarm battery should be 6V.
|Equipment Item||Code No.||Height in (mm)||Width in (mm)||Depth in (mm)||Weight lb (kgs)|
|12-line PMBX||N569||7.75 (196)||21.5 (541)||14 (355)||23 (10.4)|
|25-line PMBX||N566||12.5 (317)||23 (584)||9.5 (241)||56 (25.4)|
Plessey Publication No. 7160 (1971)
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