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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.20 : Transmission systems
|
| Number of pages | 5 |
| Year | 1980 |
| Document history | |
| Country | Switzerland |
| Keyword | CCITT Q.257;ITU-T 257;257 |