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Non-Facility Associated Signalling
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Geliefert zwischen Mo., 17.11.2025 und Di., 18.11.2025
Details
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Non-Facility Associated Signalling or NFAS is a Primary Rate Interface configuration whereby multiple T1 carriers share a signaling channel (or D channel). A T1 circuit typically carries 24 individual timeslots. Each timeslot in turn carries a single telephone call. When a T1 circuit is used to carry Primary Rate ISDN one of the timeslots is used to carry the D channel. A single Primary Rate ISDN circuit is thus sometimes described as 23B + D. There are 23 bearer channels carrying voice or data, and one D channel carrying the Common Channel Signaling. In an NFAS configuration, multiple T1 circuits share a single D channel, with an upper limit of 20 T1 circuits in a single NFAS configuration. A full NFAS configuration can then be described as 479B + D. There is one problem; a failure on the T1 trunk carrying the D channel will also affect all 19 other trunks. The solution is D channel backup where a second D channel is configured on another trunk. In the event of failure the backup D channel takes over the signalling. So the final configuration is 478B + D + D-backup.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786131276798
- Genre Technik
- Editor Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
- Anzahl Seiten 84
- Herausgeber Betascript Publishing
- Größe H220mm x B220mm
- EAN 9786131276798
- Format Fachbuch
- Titel Non-Facility Associated Signalling
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