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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.40 : Data communication networks
|
| Number of pages | 6 |
| Modified by | ITU-T Q.601 to Q.695 Annex A (1993-03)
ITU-T Q.601 to Q.695 Annex B (1993-03) |
| Year | 1980 |
| Document history | |
| Country | Switzerland |
| Keyword | CCITT Q.623;ITU-T 623;623 |