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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.080 : Integrated Services Digital Network (ISDN)
|
| Number of pages | 7 |
| Replace | ITU-T Q.521 (1988) |
| Year | 1990 |
| Document history | ITU-T Q.521 (1993-03) |
| Country | Switzerland |
| Keyword | CCITT Q.521;ITU-T 521;521;ITU-T Q.521 |