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IT 1101 - IT 1202, IT 2101 - IT 2212,

In 1955 GEC renumbered all their telephones with the prefix TEL.  The IT1101 - IT1202 and IT 2101 - IT2212, which were the 1947 part numbers for the this series of phones, were part of this renumbering.  Please see the table below for more information.


The principal aim of telephone designers has always been to raise the convenience of telephone conversation to the same level of facility as exists in normal direct conversation between two people. The G.E.C. Loudspeaking Master Station, with which the use of a handset is not necessary, brings its user much nearer to that objective than does any other telephone instrument.

It enables telephone conversation to proceed while allowing the user complete freedom to move about the room, or to make notes and consult references. Both hands are free. There is as little restriction as if the other party were in the same room.

This loudspeaking instrument is supplied as part of an inexpensive but highly-efficient intercommunication telephone system, which is particularly suited to the requirements of the business organisation of limited size. In large organisations, the system is invaluable as an auxiliary to the main telephone system, to provide directors and executives with immediate communication with their close associates.

By means of his Master Station, the executive can dominate the system, exercising complete priority in communication. He can get through to any substation, whether or not it is engaged, and he can obtain conference facilities when required.

Two sizes of instrument are available - one to provide for systems up to II stations and the other up to 21 stations - either of which can include one, two or three master stations. All parties can engage in separate simultaneous conversations. The high performance is obtained without the use of amplifiers.

The Loudspeaking Master Station is housed in a polished wood cabinet of pleasing design. The highly-sensitive microphone and loudspeaker are mounted behind a fluted grill, at the front. The switches for calling the other parties on the system are identified by names on plastic labels, which can be easily changed if desired.

Mounted at the side of the cabinet is a special G.E.C. handset, finished to match the cabinet, which can be used when conversation on the loudspeaker is not desired.

The System can include 3 master stations, with Substations making a total of 21, all with full intercommunication.

Simplicity of Operation
TO INITIATE A CALL FROM A MASTER STATION, the switch designated by the name of the required party is depressed. No further manual action is necessary until the switch is restored at the conclusion of the conversation.

Two or more stations can be called simultaneously for conference purposes, and additional stations can be brought into a conversation at any time.

When the call is received by the substation, a panel on the substation set is illuminated, and a buzzer note is heard. This buzzer note is continuous, as distinct from the usually intermittent note when another substation is calling. The called substation is therefore given both audible and visual warning that a priority call from a Master Station is coming through. Should the substation be already engaged, no buzzer note is heard, but the panel is illuminated, indicating that a priority call is waiting. By pressing a button, the substation can immediately bring in the Master Station.

WHEN A CALL IS RECEIVED BY A MASTER STATION, warning is given by a buzzer note. At the same time the panel bearing the name of the calling station is illuminated. To complete the connexion, the switch associated with the calling station is depressed. Should the Master Station be already engaged a buzzer note is not heard, but the name panel will still glow. For quiet surroundings, the touch of a switch cuts off the buzzer and calls are then signalled by clicks.

When the Master Station user desires a more intimate conversation, he can transfer to the handset by the simple action of lifting it from its position at the side of the cabinet. The loudspeaker is then cut off automatically.

IT 1101 - 10 Line Master - Standard
IT 1102 - 20 Line master - Standard
IT 2109 - 20 Line Substation for use with 3 Masters.
This set has 20 push buttons and lamp panels for three Master Stations.
It has a plastic case and is suitable for table or wall.


(Catalogue numbers in brackets are the new 1955 catalogue numbers)

LOUDSPEAKING MASTER-SET Standard Finish Tropical Finish
10 line 20 line 10 line 20 line
IT 1101



Standard Finish Tropical Finish
10 line 20 line 10 line 20 line
Table Wall Table Wall Table Wall Table Wall
1 Loudspeaking Master Set IT 2101
IT 2104 IT 2107
IT 2110 IT 2201
IT 2204 IT 2207
IT 2210
2 Loudspeaking Master Sets IT 2102
IT 2105 IT 2108
IT 2111 IT 2202
IT 2205 IT 2208
IT 2211
3 Loudspeaking Master Sets IT 2103
IT 2106 IT 2109
IT 2112 IT 2203
IT 2206 IT 2209
IT 2212

TEL/1D, TEL/2D, TEL/3D and TEL/4D were superseded by TEL/11D, TEL/12D, TEL/13D and TEL/14D

This series of telephones was introduced in 1947.

Click here for a GEC Current Comments article

Taken from the GEC Catalogue Leaflet ITL 2


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Last revised: November 26, 2021