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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.40 : Data communication networks
|
| Number of pages | 41 |
| Replace | ITU-T X.121 (1996-10) |
| Year | 2000 |
| Document history | ITU-T X.121 (2000-10) |
| Country | Switzerland |
| Keyword | CCITT X.121;ITU-T 121;121;ITU-T X.121 |