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This Recommendation contains provisions regarding the use of display screens in telex machines..
| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.050.30 : Equipment for telex, teletext, telefax |
| Number of pages | 2 |
| Replace | ITU-T S.21 (1988) |
| Year | 1990 |
| Document history | ITU-T S.21 (1993-03) |
| Country | Switzerland |
| Keyword | CCITT S.21;ITU-T 21;21;ITU-T S.21 |