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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.080 : Integrated Services Digital Network (ISDN)
|
| Number of pages | 30 |
| Modified by | ITU-T Q.81 AMD 1 (1991) |
| Year | 1980 |
| Document history | |
| Country | Switzerland |
| Keyword | CCITT Q.81;CCITT Q.81.1;ITU-T Q.81;ITU-T 81;81 |