13 Facts About Telex

Telex network is a station-to-station switched network of teleprinters similar to a telephone network, using telegraph-grade connecting circuits for two-way text-based messages.

Telex was a major method of sending written messages electronically between businesses in the post–World War II period.

Telex provided the first common medium for international record communications using standard signalling techniques and operating criteria as specified by the International Telecommunication Union.

Telex began in Germany as a research and development program in 1926 that became an operational teleprinter service in 1933.

Telex served as the forerunner of modern fax, email, and text messaging – both technically and stylistically.

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The country codes for the first countries to adopt Telex are single letters, while other countries have two-letter codes.

Telex billing was always by connected duration, so minimizing the connected time saved money.

Telex could be used as a rudimentary but functional carrier of information from one IT system to another, in effect a primitive forerunner of electronic data interchange.

Telex numbering plan, usually a six-digit number in the United States, was based on the major exchange where the customer's telex machine terminated.

Bell Telex users had to select which IRC to use, and then append the necessary routing digits.

Telex began in the UK as an evolution from the 1930s Telex Printergram service, appearing in 1932 on a limited basis.

Telex is still in operation but not in the sense described in the CCITT Blue Book documentation.

Telex has been mostly superseded by fax, email, and SWIFT, although radiotelex is still used in the maritime industry and is a required element of the Global Maritime Distress and Safety System.