noun
telex; teletypewriter exchange
Abbreviation of 'teletypewriter exchange'; refers to the telex network and its messages. Now largely historical.
当時は海外との連絡にテレックスを使っていた。
Back then, we used telex to communicate with overseas offices.
Fax replaced telex for document transmission; テレックス is older and text-only.
Telegram; a single message, while テレックス is a switched network for direct typed communication.
From English 'telex', a blend of 'teletypewriter' and 'exchange'.