Hierarchical data transmission system
AssigneeFujitsu Limited
InventorsMasakazu Mori, Takeo Fukushima, Naonobu Fujimoto
Life of this patent
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Abstract
A hierarchical data transmission system is comprised, on the transmitter side, of pre-group multiplexers and a main-group multiplexer and, on the receiver side, of a main-group demultiplexer and pre-group demultiplexers. The main-group multiplexer is fabricated as a parallel-serial converting unit, and the main-group demultiplexer is fabricated as a serial-parallel converting unit. Each of the pre-group multiplexers produces a pre-group data train having a sub-data signal which is also utilized for distinguishing one pre-group data train from another. Each of the pre-group demultiplexers is provided with a discriminator operative, by using the sub-data signal, to distinguish one received pre-group data train from another.
Claims18
A hierarchical data transmission method for a system comprising:
- a transmitter for providing a plurality of pre-group data trains, each pre-group data train composed of a main-data signal and a sub-data signal multiplexed with the main data signal;
- a receiver for reception of a main group data train and for reproduction of the pre-group data trains;
- and a transmission line connected between the transmitter and receiver, the method comprising the following steps:
- (a) forming, in the transmitter, a plurality of pre-group data trains such that the pre-group data trains contain therein individual sub-data, the sub-data including an individual signal pattern identifying each corresponding pre-group data train;
- (b) multiplexing, in the transmitter, the pre-group data trains into a main-group data train to be provided to the transmission line, by applying a parallel-serial conversion to the pre-group data trains;
- (c) receiving, in the receiver, the main-group data train and demultiplexing the received main-group data train into a plurality of pre-group data trains, by applying a serial-parallel conversion to the received main-group data train;
- and
- (d) detecting, in the receiver, the individual signal patterns of each of the demultiplexed pre-group data trains and discriminating the pre-group data trains from each other in dependence on the individual signal patterns.
A hierarchical data train system, comprising:
- a transmitter for providing a plurality of pre-group data trains, each composed of main-data and sub-data multiplexed with said main data;
- a receiver for reception of the mulitplexed data train and reproduction of the pre-group data trains;
- and
- a transmission line connected therebetween;
- the transmitter comprising N (where N is an integer larger than or equal to 2) pre-group multiplexer means and main-group multiplexer means, where each of said pre-group multiplexer being means for forming the sub-data including an individual signal pattern which is different from that of the sub-data signal contained in other pre-group data trains, and the main-group multiplexer means being for performing a parallel-serial conversion with respect to the N pre-group data trains to provide said main-group data train, serially multiplexed, to the transmission line;
- and
- the receiver comprising main-group demultiplexer means, N selector means, N pre-group demultiplexer means, and N discriminator means one being provided for each said pre-group demultiplexer means, where the main-group demultiplexer means being for performing a serial-parallel conversion with respect to the main-group data train serially multiplexed as supplied from the transmission line to reproduce the N pre-group data trains, the selector means being for selecting a proper one of the individual pre-group data trains under control of the respective discriminator means, and the discriminator means being for detecting whether the pre-group data train, now selected, is a proper or an improper data train using said individual signal pattern corresponding to the pre-group data train.
a data transmission system, comprising:
- first means for multiplexing first data signals, inserting a first identifying signal in said multiplexed first data signal and producing a first output;
- second means for multiplexing second data signals, inserting a second identifying signal different from the first identifying signal in said multiplexed second data signals and producing a second output;
- parallel-to-serial converting means for combining the first and second outputs;
- a transmission path carrying the combined first and second outputs;
- serial-to-parallel converting means for separating the combined first and second outputs;
- first selecting means for selecting the first output in dependence on the first identifying signal;
- second selecting means for selecting the second output in dependence on the second identifying signal;
- and
- first and second demultiplexing means for demultiplexing the first and second data signals from the first and second outputs.
Dependencies are inferred from the claim text.