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 No. 4002-A - SELECTOR SET
This
is a combined Selector and Telephone Set designed for use as a way station on
continuously manned traffic control lines (pictured to the right).
It houses one 4304-A Selector (which must be ordered
separately).
Weight - 8.75lb. (3.97kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)
No. 4002-B SELECTOR SET
This set is similar to the 4002-A but is provided with a protector and line
looping key for calling control. It houses one 4304-A Selector (which must be
ordered separately).
Weight - 8lb. 14oz (4kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)
No. 4002-C SELECTOR SET
This is similar to the 4002-A except that no protector is fitted and the
ring-back tune is removed from the line when the microtelephone is fitted from
the switch hook.
The terminal strip for making external connection is fitted
outside the case and may be provided with an insulated cover if ordered
separately. It houses one 4304-A Selector (which must he ordered separately).
Weight - 8lb. 14oz. (4kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)
No. 4002-D SELECTOR SET
The 4002-D Selector Set is a Traffic Control Way Station Set designed for use in
conjunction with a 4304-A Selector on tines of up to 50 miles in length. having
a maximum of 20 Sets bridged across the tine. This Set is not suitable for
use where General Call or Group Calling is required.
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)
No. 4002A is taken from:-
STC Catalogue for Railway Systems Apparatus, D/DT. 17D1, Edition 1 (1957)
Circuit diagram
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STC TELEPHONE No. 4002