Indian Telephone Industries (ITI)

ITI is another imprint found on 300 type telephones; it stands for Indian Telephone Industries, a company established in 1948 with help from ATE.  Tooling for the Telephone No. 332 was exported to India and is/was used to produce these telephones (the mouldings look rather rough now).

All the components are fixed to the base plate.  There are two air vents in the base and the feet are press fit.  The terminal strip is not numbered as expected - it is numbered in a circular manner, starting lower right and anti-clockwise.

Typical base markings for an Indian example are:- DJL 11044-A8. Manufactured by Indian Telephone Industries. Bangalore B 71/1 INDIA.

The Handset will most probably have ITI stamped centrally on the handle.

The picture below gives a good indication of the colour range available:-

Top row - Mushroom, Peach, Powder Pink, Ivory.
Bottom row - Red, Light Green, Powder Blue, Black.

The ITI dial is based on the ATM No. 24C dial and therefore the finger stop will always be some distance from the digit 0.

Indian Dial - Front Indian Dial - Rear

Conversion Information for Plug and Socket working in the UK
This UK conversion information refers to the ITI 332 with 13 terminals and the large cylindrical capacitor.  Converted phones should not be connected to any network provider in the UK.  The old line cord is discarded and a new style line cord with plug one end and spade terminals the other installed.

  1. Remove the existing line cord from terminals 6 & 8.
  2. Remove the metal link between terminals 5 and 6.
  3. Insert a 3.3k resistor between terminals 5 and 6.
  4. Link terminals 8 and 9 together.
  5. Check that terminals 11 and 12 are linked.
  6. Connect the red of the new line cord to terminal 8.
  7. Connect the white of the new line cord to terminal 6.
  8. Disconnect the orange wire from the capacitor.
  9. Connect the orange wire to the new blue line cord spade and insulate.
  10. Insulate the green wire of the new line cord - it is not connected to anything.
  11. Connect a rectifier element across terminals 1 and 2.

This is the circuit diagram of the above phone

ITI 332 Base Plate

Note the two vents and push fit rubber feet
 

 ITI 332 Internal view

The round capacitor may be replaced by a small oblong capacitor.  The rubber fixings are left in situ.  The circuit may also be different the later model.

Beware - The terminals on the connection plate number 1 to 13, starting lower right to left and then top left to right.  See below.

     7     8     9     10     11       12     13
6 5 4 3 2 1

Additional Pictures

Front view Base View
This set is a late reproduction and the imprint on Handset stands out and is not recessed

General information on GPO 300 type telephones

Adjustment of Magneto bells

Labels that fit in the sliding tray

Identifying a reproduction and collectors information

 

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: March 11, 2016

FM