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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.01 : Telecommunication systems in general
|
| Year | 2009 |
| Document history | |
| Country | International |
| Keyword | CCITT E.157;ITU-T 157;157;ITU-T E.157 |