BT Archives

Events in Telecommunications History

1971

Transatlantic dialling was extended. Six British cities (Birmingham, Edinburgh, Glasgow, Liverpool, London and Manchester) were able to dial direct to the whole of the mainland of the USA by dialling 0101 followed by the USA area code and local number.

Confravision, the world's first public bothway television system giving conference facilities to groups of people in different cities, was made available by the Post Office at its studios in Birmingham, Bristol, Glasgow, London and Manchester.

In July the Post Office announced the development of the 1+1 subscribers carrier system by means of which two subscribers could speak simultaneously on one line.

The last Director exchange converted to STD (Ilford Central).

The first TXK2 exchange was opened at Nutfield Ridge, Surrey.

The first TXK3 exchange was opened at North Cheam, Surrey. The first production TXK3 exchange was opened at Liberton, Edinburgh.

The introduction of decimal coinage resulted in a fundamental change in the design of the payphone coinbox mechanism. Built to take up to three different duodecimal coins in the value ratio 1:2:4 it now had to be modified to a 1:2:5 value ratio.

The Viewdata (Prestel) idea was conceived by Sam Fedida at the Post Office Research Laboratories at Dollis Hill, London.

The Dataplex 1 service (FDM) was introduced.

The first direct submarine cable link was laid between the UK and Spain.

Gardening and Bedtime Story Services were introduced as an addition to the range of recorded information services provided by Post Office Telecommunications.

Transit Network opened with the connection of Kingsbridge, Wolverhampton and Worcester.

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