What is advantages and disadvantages of telex?

Answer 1

telex has almost disappeared, superseded by the fax machine and email.

The advantage over telegraph is that ordinary people could read the output (Latin alphabet cf. Morse Code), and over the telephone that there was a written record and the recipient did not need to be present to receive a message.

The disadvantages are, I think, that it is expensive and requires special phone connections.

Answer 2

telex alomost disparate supperseded by the fax machine and email.