EP0229684A2
Expired / Lapsed
EP
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Data framing system for time division multiplexing transmission
Assignee: Toshiba Corp
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Filing: 1987-01-02
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Granted: —
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Expires: 2007-01-02
Abstract
Abstract A central station (l) and a plurality of local stations (2₁ - 2 n ) are coupled through a signal transmission path (3, 4). Data signals (DOl - DOn; DIl - DIn) addressed to local stations, to which terminal devices such as telephone sets are coupled, are transmitted over the signal transmission path on a time-division multiplexing basis. Each local station sends the data signal onto the signal transmission path at a timing depending on a measured transmission delay time of a signal on the signal transmission path between itself and the central station. One transmission frame consists of subframes of data signals addressed to the local stations and a window frame for transmission delay time measurement. A maximum network length depends on the time duration of the window frame. In order to extend the time duration of the window frame and to increase the maximum network length, data signals for the same terminal device coupled to a local station are multiplexed in one time slot of a subframe.
Inventors
- 👤 Hiroshi C/O Patent Division Kobayashi
- 👤 Hideaki C/O Patent Division Haruyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:02
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682; H04L; H04L12/00; H04L12/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
A communication network system comprising: a central station (l); a plurality of local stations (2₁, 2₂,..., 2 n ) to each of which at least one terminal device (5) is coupled; and a signal transmission path (3, 4) connected between said central station and said local stations, said central station being arranged to send information signals (DOl - DOn) addressed to terminal devices coupled to said local stations onto said signal transmission path during one transmission frame period on a time-division multiplexing basis, information signals for one local station forming one subframe having at least one time slot, and said local station each being arranged to send an information signal (DIl - DIn) onto said signal transmission path toward said central station at a timing depending on a measured transmission delay time of said signal transmission path between itself and said central station, characterized in that said central station (l) and said local stations (2₁ - 2 n ) are each arranged to multiplex information signals for one terminal device which are generated, in a plurality of periods of a fundamental signal for time-division transmission of information signals, in one time slot in a subframe, and send the multiplexed information signals onto said signal transmission path (3, 4).
Claim 2
Dependent Claim
208 words
A communication network system comprising: a central station (l); a plurality of local stations (2₁, 2₂,..., 2 n ) to each of which at least one terminal device (5) is coupled; and a signal transmission path (3, 4) connected between said central station and said local stations, said central station being arranged to send information signals (DOl - DOn) addressed to terminal devices coupled to said local stations onto said signal transmission path during one transmission frame period on a time-division multiplexing basis, information signals for one local station forming one subframe having at least one time slot, and said local station each being arranged to send an information signal (DIl - DIn) onto said signal transmission path toward said central station at a timing depending on a measured transmission delay time of said signal transmission path between itself and said central station, characterized in that said central station (l) and said local stations (2₁ - 2 n ) are each arranged to multiplex information signals for one terminal device which are generated, in a plurality of periods of a fundamental signal for time-division transmission of information signals, in one time slot in a subframe, and send the multiplexed information signals onto said signal transmission path (3, 4).
Claim 3
Independent Claim
44 words
A system according to claim l, characterized in that one transmission frame of information signals transmitted over said signal transmission path consists of a plurality of subframes assigned to the respective local stations, and a subsequent window frame adapted for transmission delay time measurement.
Claim 4
Dependent Claim
29 words
A system according to claim 2, characterized in that a time duration of the window frame is set longer than a maximum delay time of said signal transmission path.
Claim 5
Independent Claim
100 words
A system according to claim l, characterized in that one transmission frame of information signals transmitted from said central station (l) to said local stations (2₁ - 2 n ) includes a subframe of address data for designating one local station, and each of said local stations designated by the address data is arranged to send a test signal for transmission delay time measurement onto said signal transmission path, said test signal being sent back from said central station to the sending local station in order to measure a transmission delay time between said local station and said central station.
Claim 6
Independent Claim
26 words
A system according to claim l, characterized in that the fundamental signal for time-division transmission has a period depending on a sampling rate of information signals.
Claim 7
Independent Claim
26 words
A system according to claim l, characterized in that unit data signal transmitted over said signal transmission path includes audio information (B) and control information (D).
Claim 8
Dependent Claim
18 words
A system according to claim 6, characterized in that two channels (2B) are assigned to the audio information.
References Cited (Backward Citations)
No citation records indexed.
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