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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.01 : Telecommunication systems in general
|
| Number of pages | 4 |
| Replace | ITU-T S.1 (1988) |
| Year | 1990 |
| Document history | ITU-T S.1 (1993-03) |
| Country | Switzerland |
| Keyword | CCITT S.1;ITU-T 1;1 |