Multiplex communications – Pathfinding or routing – Through a circuit switch
Patent
1997-03-12
2000-03-07
Kizou, Hassan
Multiplex communications
Pathfinding or routing
Through a circuit switch
370421, 370463, H04L 1228
Patent
active
060349530
ABSTRACT:
A system for interfacing a plurality of analog telephones to an integrated services digital network (ISDN) line of telecommunications network is disclosed. The system comprises a plurality of line interface units connected to respective telephones and a distribution line, and a communications controller interconnects the distribution line and the ISDN line. The communications controller transmits digital data frames on the distribution line, each frame having a frame start and a plurality of control channels and voice channels of which respective voice and control channels are associated with respective line interface units. The controller can instruct each line interface unit on the control channel of that unit, to issue ringing voltage, dial tone, busy tone or ringing tone, and it selectively couples the voice channels to the ISDN line. Each line interface unit can inform the communications controller, on the control channel of that unit, of switch-hook status of the connected telephone, a dialed directory number or dual tone multi-frequency (DTMF) digits collected. It also performs analog to digital coding and decoding of outbound and inbound voice signals, respectively, between the connected telephone and the voice channel of that unit.
REFERENCES:
patent: 4445213 (1984-04-01), Baugh et al.
patent: 4932022 (1990-06-01), Kenney et al.
patent: 4970723 (1990-11-01), Lin
patent: 5062103 (1991-10-01), Davidson et al.
patent: 5127003 (1992-06-01), Doll, Jr. et al.
patent: 5185765 (1993-02-01), Walker
patent: 5305312 (1994-04-01), Fornek et al.
patent: 5341377 (1994-08-01), Ohtani
patent: 5371534 (1994-12-01), Dagdeviren et al.
patent: 5373316 (1994-12-01), Ishinabe et al.
patent: 5398249 (1995-03-01), Chen et al.
patent: 5416781 (1995-05-01), Ruiz
patent: 5420867 (1995-05-01), Price et al.
patent: 5457692 (1995-10-01), Ishinabe et al.
patent: 5574861 (1996-11-01), Lorvig et al.
patent: 5579370 (1996-11-01), Fukushima et al.
patent: 5600655 (1997-02-01), Ishinabe et al.
patent: 5613164 (1997-03-01), DiAngelo et al.
patent: 5629931 (1997-05-01), Kausel
Kizou Hassan
Nortel Networks Corporation
Slavitt Mitchell
LandOfFree
System for local voice distribution by an ISDN communications co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for local voice distribution by an ISDN communications co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for local voice distribution by an ISDN communications co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-369516