|AUTOMATIC OR C.B., WITH SWITCHING FACILITIES
(PLAN NUMBER WORKING)
These telephones have up to three push buttons for operating various extension schemes without the use of separate switches or a switchboard. They accommodate key units having from one to nine springsets, of the make before-break changeover (K) type (or other desired combination) which are operated by the push buttons.
For a simple extension or for re-calling, a P.B.X. operator, a 1 button telephone with 1K springset is used. For other schemes the key units have a number of springsets, the standards being 4 and 9 sets.
The three buttons on a telephone with a 4K key unit operate respectively (left to right) 2K-1K-1K springsets, while on a 9K unit, 4K-1K-4K are operated. Each contact spring is wired to a separate terminal.
On the 4K and 9K units the centre key is non-locking but the outer keys can be made either non-locking or locking. Facilities are also provided for automatically releasing a key on replacement of the handset, if necessary.
The telephones listed below contain a magneto bell, similar sets with battery bell or buzzer are available. Full details of the operating requirements should be given when ordering.
The dial for auto working has standard numbering, unless otherwise requested. A dial dummy is fitted on C.B. sets.
The standard instruments are drilled for 1 or 3 buttons, any vacant position being filled with a dummy.
A directory tray cannot be incorporated.
Black is the standard colour, but ivory, red or green sets can be supplied.
Wiring is insulated with p.v.c. insulated, nylon braided cords can be supplied if specified.
Taken from the Ericsson Catalogue No. 55
N1016 was introduced around 1955.
How to convert a N1015A to work on the UK plug and socket system
Last revised: December 21, 2019