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- Non-Facility_Associated_Signalling abstract "Non-Facility Associated Signalling or NFAS is a Primary Rate Interface configuration whereby multiple T1 carriers share a signalling 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.NFAS is a cost-cutting measure. Customers ordering a Primary Rate ISDN service will be charged for each signalling channel. Therefore an NFAS configuration can be cheaper than Facility Associated Signalling, due to historical reasons. North American switches such as the Lucent 5ESS, and the Nortel DMS-100 did not handle common channel signalling such as ISDN on the same line card that terminated the T1 circuit. So, the telephone company needs to buy and maintain a separate signalling card for every D channel.The situation in Europe and the rest of the world is different. A Primary Rate ISDN configurations uses E1 carriers, where each carrier has 32 timeslots. 30 of the timeslots are used to carry calls, one timeslot is used for synchronization, and one timeslot is used to carry the signalling channel. The line cards in switches designed for the E1 system already include processing for the signalling timeslot. As a result, Non-Facility Associated Signalling is rarely used with E-carrier.".
- Non-Facility_Associated_Signalling wikiPageID "1029139".
- Non-Facility_Associated_Signalling wikiPageLength "2393".
- Non-Facility_Associated_Signalling wikiPageOutDegree "19".
- Non-Facility_Associated_Signalling wikiPageRevisionID "681377783".
- Non-Facility_Associated_Signalling wikiPageWikiLink 5ESS_switch.
- Non-Facility_Associated_Signalling wikiPageWikiLink Bearer_channel.
- Non-Facility_Associated_Signalling wikiPageWikiLink Broadcast_programming.
- Non-Facility_Associated_Signalling wikiPageWikiLink Category:Integrated_Services_Digital_Network.
- Non-Facility_Associated_Signalling wikiPageWikiLink Common-channel_signaling.
- Non-Facility_Associated_Signalling wikiPageWikiLink Common_Channel_Signaling.
- Non-Facility_Associated_Signalling wikiPageWikiLink D_channel.
- Non-Facility_Associated_Signalling wikiPageWikiLink Digital_Multiplex_System.
- Non-Facility_Associated_Signalling wikiPageWikiLink E-carrier.
- Non-Facility_Associated_Signalling wikiPageWikiLink ISDN.
- Non-Facility_Associated_Signalling wikiPageWikiLink Integrated_Services_Digital_Network.
- Non-Facility_Associated_Signalling wikiPageWikiLink Line_card.
- Non-Facility_Associated_Signalling wikiPageWikiLink Primary_Rate_Interface.
- Non-Facility_Associated_Signalling wikiPageWikiLink Signaling_(telecommunications).
- Non-Facility_Associated_Signalling wikiPageWikiLink T-carrier.
- Non-Facility_Associated_Signalling wikiPageWikiLink Telephone_call.
- Non-Facility_Associated_Signalling wikiPageWikiLink Timeslot.
- Non-Facility_Associated_Signalling wikiPageWikiLinkText "Non-Facility Associated Signalling".
- Non-Facility_Associated_Signalling wikiPageWikiLinkText "non-facility associated signalling".
- Non-Facility_Associated_Signalling hasPhotoCollection Non-Facility_Associated_Signalling.
- Non-Facility_Associated_Signalling wikiPageUsesTemplate Template:References.
- Non-Facility_Associated_Signalling subject Category:Integrated_Services_Digital_Network.
- Non-Facility_Associated_Signalling hypernym Configuration.
- Non-Facility_Associated_Signalling type Aircraft.
- Non-Facility_Associated_Signalling type Protocol.
- Non-Facility_Associated_Signalling comment "Non-Facility Associated Signalling or NFAS is a Primary Rate Interface configuration whereby multiple T1 carriers share a signalling 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.".
- Non-Facility_Associated_Signalling label "Non-Facility Associated Signalling".
- Non-Facility_Associated_Signalling sameAs m.03_pbn.
- Non-Facility_Associated_Signalling sameAs Q7048749.
- Non-Facility_Associated_Signalling sameAs Q7048749.
- Non-Facility_Associated_Signalling wasDerivedFrom Non-Facility_Associated_Signalling?oldid=681377783.
- Non-Facility_Associated_Signalling isPrimaryTopicOf Non-Facility_Associated_Signalling.