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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.40 : Data communication networks
35.100.01 : Open systems interconnection in general |
| Number of pages | 19 |
| Year | 1990 |
| Document history | |
| Country | International |
| Keyword | CCITT X.637;ITU-T 637;637;ITU-T X.637 |