SWITCHBOARD No. N115
Indicator Signalling with Automatic or C.B. exchange lines
This indicator signalling switchboard extends the capacity range of desk-top cordless units to five exchange lines and 20 extensions. Seven connecting circuits are provided.
By the use of miniature keys and indicators, and lightweight structural materials, the size and weight are kept to the minimum.
An improved form of construction contributes to the switchboard's modern appearance and
provides increased access to equipment for maintenance.
Construction and Finish
Replaceable plastic laminated panels enclose the equipment. The back and top are a single sheet which clips in at the top and can be removed to obtain access to the rear equipment after releasing three captive screws at the bottom. The switchboard 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.
The appearance is enhanced by black indicators and a black handset and cord. A dial
dummy instead of the dial
The equipment has full tropical finish; i.e. coils are impregnated and metal parts specially finished.
Conductors are insulated with p.v.c., which is moisture-proof and not subject to fungoid growth or attack by insects.
An internal terminal field permits direct termination of incoming lines. Alternatively, a flexible connecting cord and cable distribution box can be supplied.
The handles of the associated keys are tipped with red or green inserts to match; this facilitates accurate operating and enables operated keys to be instantly discerned.
The dial has standard numbering and a 2:1 break/make pulse ratio. The hand generator is of the rotating-magnet type, but can be replaced or supplemented by a transistor ringing unit if specially ordered. Relays and battery-feed retards are Type N30000 (BPO 3000).
Also included are an alarm buzzer and cut-off key, and a plug-in light-weight handset
with capsule receiver and coiled cord. In lieu of, or in addition to, the handset, a
lightweight headset can be supplied.
All were supplied in two-tone grey.
Last revised: October 12, 2019