GEC No. 5100 Type

Click here for an article from GEC Current Comments

PRIVATE AUTOMATIC EXCHANGES
No. 5100 TYPE

THIS small G.E.C. unit has an ultimate capacity for 25 lines, but can be equipped with as few as 10 extensions.  It can be fixed on a shelf or table, but is particularly adapted for wall mounting, the backboard being provided with battens for this purpose.  The apparatus is mounted on a metal framework hinged to the backboard so that it can be swung forward to facilitate inspection of the wiring.  It is suitably protected against dust or damage by a wood cover.

The unit is very compact, being only 23" high, 16" wide, and 10.5" deep, and can consequently be fitted practically anywhere.

Telephone suitable for use with the No. 5000 type P.A.X. is the Cat No. 90 (DC Ringing). Only a triple conductor is necessary to connect the instruments to the switchboard.

POWER PLANT
A 12 volt current is required, and the following power plants are suitable:-

D.C. SUPPLY UP TO 250 VOLTS
Two sets of "Mass" type batteries, each consisting of 6 cells and having a capacity of 70 ampere hours on slow discharge. A control panel fitted with necessary switches and fuses to enable one battery to be on discharge whilst the other is charging, and a small lamp resistance panel fitted in an adjacent position.

A.C. SUPPLY UP TO 250 VOLTS
One set of "Mass" type batteries, as above. One Dry Plate Rectifier with charging rate 0/0.2 ampere. A control panel fitted with necessary fuses.
 

12 Volt Rotary System (DC Ringing)

Taken from the GEC Private Automatic Telephone Exchanges No. 18 (1932)

Last revised: November 25, 2021