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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 35.110 : Networking
|
| Number of pages | 45 |
| Year | 1990 |
| Document history | |
| Country | International |
| Keyword | CCITT Q.1221;ITU-T 1221;1221;ITU-T Q.1221 |