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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.20 : Transmission systems
|
| Number of pages | 38 |
| Year | 1990 |
| Document history | |
| Country | International |
| Keyword | CCITT T.121;ITU-T 121;121 |