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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.20 : Transmission systems
|
| Replace | ITU-T P.57 (2009-04) |
| Year | 2011 |
| Document history | ITU-T P.57 (2011-12) |
| Country | International |
| Keyword | CCITT P.57;ITU-T 57;57;ITU-T P.57 |