EP0132464A1
Expired / Lapsed
EP
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Video and data distribution module with subscriber terminal
Assignee: Manitoba Telephone System
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Filing: 1983-07-15
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Granted: —
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Expires: 2003-07-15
Abstract
Abstract A subscriber data distribution system (RVDM) comprising first means for translating data received from a transmission line (2) and transmitting the data to a subscriber terminal (STU) via a subscriber drop, second means for translating data received from a subscriberterminal and transmitting the data to the transmission line, the first and second means including means for isolating the transmission line from the subscriberterminal, and for regenerating the data transmitted both to and from the subscriber terminal.
Inventors
- 👤 Irving Gimple
- 👤 William Rodman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:12
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/068; H04L; H04L12/00; H04L12/28; H04L12/2801; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/17345; H04N7/17354
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
(1) A digital data transmission system comprising a central station including means for transmitting and receiving digital data signals in a format having a series of frames each having a plurality of time slots and each time slot having a plurality of bits, a plurality of remote subscriber terminal units each including means for transmitting and receiving digital data signals in said format, a plurality of remote receiving stations, each receiving station having connected thereto a plurality of said subscriber terminal units, and tree-type transmission means interconnecting said central station with each of said receiving stations, characterized in that each receiving station including means for receiving digital data signals in said format from said central station and from said subscriber terminal units connected thereto and for regenerating from said received data signals new data signals in said format and means for transmitting said new data signals to said subscriber terminal units and to said central station respectively.
Claim 2
Dependent Claim
43 words
(2) A system as defined in Claim 1 wherein said transmitting means includes means for scanning each of the subscriber terminal units in sequential time slots and means for transmitting said data signals to respective subscriber terminal units in time slots allocated thereto.
Claim 3
Dependent Claim
68 words
(3) A system as defined in Claims 1 or 2 wherein the format includes data signals designated as address, data and control signals, wherein the transmission means of each receiving station includes means for stripping of the control signals and integrating new control signals with regenerated data signals, and means for transmitting the new control signals and regenerated data signals to designated ones of said subscriber terminal units.
Claim 4
Dependent Claim
38 words
(4) A system as defined in Claim 3, including means for modulating the data signal and new control bits on an outgoing carrier for transmission to the subscriber drops, the outgoing carrier being derived from the incoming carrier.
Claim 5
Dependent Claim
149 words
(5) A system defined in any preceeding claim wherein each said receiving station includes means for receiving data signals from the individual subscriber terminal units modulated on a second carrier each during the predetermined time slots, means for demodulating the second carrier to derive demodulated data bits, means for applying the demodulated data bits to a controller, the controller being adapted to reformat the demodulated data bits and to write them at first predetermined times designated by the controller into a memory, means for reading the memory at times delayed from the first predetermined times, and means for applying the data from the memory to a modem for modulation on an outgoing carrier and application to the transmission means, the delay being predetermined to .-place the outgoing data in bit synchronization and in a predetermined frame with the incoming data at a remote location connected to the transmission lines.
Claim 6
Dependent Claim
72 words
(6) A system as defined in Claim 5 further including a plurality of television channel converters having inputs connected to the transmission means for reception of CATV signals, individual outputs thereof connected to corresponding subscriber terminal units, control inputs of the converters being connected to the receiving stations for controlling individual channels applied to the subscriber terminal units upon reception of a converter selection control signal from a corresponding subscriber terminal unit.
Claim 7
Dependent Claim
172 words
(7) A system as defined in any preceeding claim in which each subscriber terminal unit is comprised of: (a) a modem for receiving data signals modulated on the incoming carrier having a first frequency, for deriving a bit clock signal from the incoming carrier and for transmitting data signals on an outgoing carrier having a second frequency, (b) means for applying the received data signals to a bus system, (c) means for connecting a plurality of ports to the bus system, the ports being adapted to connect data generating apparatus to the bus system, when enabled, (d) control means connected to the bus system and to the means for connecting a plurality of ports for controlling the operation of the ports, and for generating said outgoing data signals in response to the application of control signals from the ports generated by said data generating apparatus to the bus system, in synchronization with said bit clock, and (e) means for applying outgoing data signs to the modem for modulation on the outgoing carrier.
Claim 8
Dependent Claim
40 words
(8) A system as defined in Claim 7, in which the means for connecting a plurality of ports to the bus system is comprised of a plurality of switches enabled from the bus system under control of the control means.
Claim 9
Dependent Claim
99 words
(9) A system as defined in Claim 8, further including a codec connected in a circuit to the modem for received data signals therefrom, a subscriber line interface circuit connected to the codec and having a tip and ring lead for connection to a telephone set, means for detecting supervisory signals generated by a telephone set connected between the tip and ring lead and a read port connected to the bus system, and a write port connected between the bus system and the subscriber line interface system for generating ringing signals for application to the tip and ring lead.
Claim 10
Dependent Claim
79 words
(10) A system as defined in Claims 8 or 9, in which said ports are adapted to receive data from at least ,-one of a load activity indicator, an energy meter, a keypad, a keyboard, a telephone supervisory state sensor, a fire alarm, a smoke alarm, and a plurality of burglar alarm switches, and to apply control signals to at least one of a load controller, an alphanumeric and/or illuminated display, a telephone control apparatus, and a data terminal.
Claim 11
Dependent Claim
57 words
(11) A system as defined in any of Calims 7 to 10, in which the means for connecting a plurality of ports to the bus system is comprised of a master UART, having an asynchronous bus connected to a plurality of remote addressable UARTs, further including means for connecting said data generating apparatus to the addressable UARTs.
Claim 12
Dependent Claim
93 words
(12) A system as defined in Claim 10, in which the means for connecting a plurality of ports further includes at least one write port and at least one read port, the read port being comprised of a plurality of switches enabled from the bus system under control of the control means, the write port being under control of the control means for receiving data addressed to the write port and applying said data to a terminal including are means for display of and control by said data addressed to the write port.
Claim 13
Dependent Claim
72 words
(13) A system as defined in any preceeding claim, in which the transmitting means of each receiving station is arranged to transmit data in a predetermined time slot unique to the respective terminal in one frame of said format, and in which the transmitting means of said respective terminal unit is arranged to transmit data in the same time slot and the same frame number of a later following sequence of frames.
Claim 14
Dependent Claim
108 words
(14) A system as defined in Claim 13, wherein each terminal unit includes means for storing the data for transmission for a controllable period of time, means for applying said data to the storing means via a switch, means under control of the controlling means for generating time slot controlling signals, and for applying the time slot controlling signals to the switch for controlling the application of the data to the storing means within predetermined time slot periods, and means for setting the storage time sufficient to delay the data to a period whereby it arrives at the receiving station in the same time slot and frame number.
Claim 15
Dependent Claim
157 words
(15) A system as defined in Claim 14, in which the data signals are divided into frames of data words, and including a sequence of frame bits, the frame bits having a predetermined bit pattern, the data signals including control signals in a predetermined frame, means for applying the control signals to the bus system when strobed by the bit clock and by signals designating the predetermined frame, means for deriving bits from the bit clock at a frame bit rate, means for comparing the derived bit pattern with a predetermined pattern stored in the control means, means for shifting the derived frame bit rate by one bit in the event the derived bit pattern does not match the predetermined pattern, means for counting frame bits to derive a frame count, and means for generating said time slot controlling signals from the means for deriving bits from the bit clock and the means for counting frame bits.
References Cited (Backward Citations)
EP0003823A2
Cited
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