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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.40 : Data communication networks
|
| Replace | ITU-T X.1521 (2011-04) |
| Year | 2016 |
| Document history | ITU-T X.1521 (2016-03) |
| Country | International |
| Keyword | CCITT X.1521;ITU-T 1521;1521;ITU-T X.1521 |