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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.20 : Transmission systems
|
| Number of pages | 10 |
| Cross references | GB/T 17904.2 (1999), NEQ |
| Year | 1990 |
| Document history | |
| Country | Switzerland |
| Keyword | CCITT Q.921bis;ITU-T 921;921;ITU-T Q.921bis |