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Title:
Data distribution system for private automatic branch exchange
Abstract:
A data distribution system for a private branch telephone exchange for providing information to a plurality of PBX stations. Two embodiments (serial and parallel) including addressable stations are shown. Memory devices driving a plurality of displays at each station are updated in response to command signals from a controller preceded by the station address. Each station may communicate with the controller and transmit keyed-in signals or information reflecting station availability. A novel multiplexed LCD, switching matrix bypass upon controller failure circuit, and bus protection circuit upon remote power supply failure are also shown.
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Other info:
Inventors:
Mehaffey, Joseph H. (Atlanta, GA)
Szlam, Aleksander (Marietta, GA)
Application Number:
06/054146
Filing Date: 1979-07-02
Publication_date: 1981-08-25
Assignee:
SOLID STATES SYSTEMS INC
Primary Class(es):
379/136
379/142.010, 379/263, 379/290, 379/247, 379/267
Other Classes:
H04Q3/62; H04M3/64; H04Q3/64; H04M1/56; H04Q3/56
US Patent Ref:
| 3060273 | October, 1962 | Nowak et al. | 179/27G | Standby transfer control circuitry | | 3483328 | December, 1969 | Tanke | 179/7R | METHOD FOR REGISTERING SIGNAL PULSES OCCURRING ON A SIGNAL LINE IN RANDOM SEQUENCE | | 3604857 | September, 1971 | Opferman | 179/99M | LINE-ORIENTED KEY TELEPHONE SYSTEM | | 3746797 | July, 1973 | Meise, Jr. et al. | 179/18FG | TELEPHONE SWITCHING SYSTEM SCANNING AND IDENTIFICATION ARRANGEMENT | | 3787834 | January, 1974 | Elliott | 340/784 | LIQUID CRYSTAL DISPLAY SYSTEM | | 3816768 | June, 1974 | Stein | 307/296 | MEMORY PROTECTING CIRCUIT | | 3908099 | September, 1975 | Borbas et al. | 179/175.2R | Fault detection system for a telephone exchange | | 3909545 | September, 1975 | Fuchs | 179/27G | Emergency transfer circuit for use in a communication switching system | | 3919568 | November, 1975 | Minner | 307/296 | Circuit for the preferential starting of a stage of an electronic sequence having a holding circuit | | 3928732 | December, 1975 | Simon et al. | 179/27FC | Extension and line indicating display system for key telephone system | | 3935396 | January, 1976 | Barsellotti et al. | 179/99M | Key telephone system using time division and space division control | | 3996424 | December, 1976 | Agricola | 179/18J | Electronic telephone systems | | 4081614 | March, 1978 | Dahlquist et al. | 179/18AD | Supervised single link telephone system | | 4109242 | August, 1978 | Channin | 340/784 | Matrix address system using erase operation | | 4136263 | January, 1979 | Williams | 179/18AD | Telephone system having space divided speech channels and a separate time divided data highway | | 4174466 | November, 1979 | Broger et al. | 179/18AD | Multi-party telephone system allowing speech connection between extensions as between extensions and | | 4203011 | May, 1980 | Coviello | 179/99M | Computer controlled key telephone station set |
Other Refs:
Primary Examiner:
Brown, Thomas W.
Assistant Examiner:
Attorney:
Jones, Thomas & Askew
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