Data transmission method, data transmission apparatus and data transmission system using this method

• US 20060007962A1
• Filed: 07/07/2004
• Published: 01/12/2006
• Est. Priority Date: 07/07/2004
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Enjo, Masayuki, Kawanami, Masashi
• Granted Patent: US 7,706,380 B2
• Time in Patent Office: Days
• US Class Current: 370/535
• CPC Class Codes: H04J 3/0602 Systems characterised by the synchronising information used
• CPC Class Codes: H04J 3/062 Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers pulse-stuffing H04J3/07; asynchronous-synchronous conversion H04L5/24; speed conversion H04L25/05; speed conversion in computers G06F5/06
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver

Abstract

A data transmission method includes a step of dividing each data into two or more low-speed data so as to create two or more sequences of low-speed data which are separated by no-signal intervals, a step of adding a fixed pattern for detecting a head or an end of each low-speed data included in each of the two or more sequences of low-speed data to each of the no-signal intervals included in each of the two or more sequences of low-speed data so as to create two or more sequences of fixed-pattern-added low-speed data, and a step of transmitting the two or more sequences of fixed-pattern-added low-speed data to the transmit station connected to the other network.

Claims

1. A data transmission method of transmitting a high-speed data signal, in which two or more data are disposed and separated by no-signal intervals each having a predetermined data length, from a transmit station connected to a network to a receive station connected to another network, said method comprising:

a dividing step of dividing each of said plurality of data into two or more low-speed data so as to create two or more sequences of low-speed data which are separated by no-signal intervals each having the predetermined data length;

a fixed-pattern adding step of adding a fixed pattern for detecting a head or an end of each low-speed data included in each of said two or more sequences of low-speed data to each of said no-signal intervals included in each of said two or more sequences of low-speed data so as to create two or more sequences of fixed-pattern-added low-speed data; and

a transmitting step of transmitting said two or more sequences of fixed-pattern-added low-speed data to said transmit station connected to said other network.

2. The data transmission method according to claim 1, wherein said fixed-pattern adding step is the step of, when control data is provided to the head or end of each low-speed data included in each of said two or more sequences of low-speed data in advance, overwriting the control data with a fixed pattern for detecting the head or end of each low-speed data, and adding a fixed pattern for detecting the end or head of each low-speed data to the end or head of each low-speed data.

3. The data transmission method according to claim 2, wherein the fixed patterns added to the head and end of each low-speed data included in each of said two or more sequences of low-speed data are of different types.

4. The data transmission method according to claim 2, wherein the fixed patterns added to the head and end of each low-speed data included in each of said two or more sequences of low-speed data are of an identical type, and said fixed-pattern adding step is the step of alternately adding two different types of fixed patterns to the head and end of each low-speed data included in each of said two or more sequences of low-speed data.

5. The data transmission method according to claim 2, wherein the fixed patterns added to the head and end of each low-speed data included in each of said two or more sequences of low-speed data are of different types, and said fixed pattern adding step is the step of alternately adding four different types of fixed patterns to each of the head and end of each low-speed data included in each of said two or more sequences of low-speed data.

6. A data transmission apparatus comprising:

a data dividing unit for receiving a high-speed data signal, in which two or more data are disposed and separated by no-signal intervals each having a predetermined data length, and for dividing each of said plurality of data into two or more low-speed data so as to create two or more sequences of low-speed data which are separated by no-signal intervals each having the predetermined data length;

a fixed-pattern adding unit for adding a fixed pattern for detecting a head or an end of each low-speed data included in each of said two or more sequences of low-speed data to each of said no-signal intervals included in each of said two or more sequences of low-speed data so as to create two or more sequences of fixed-pattern-added low-speed data; and

a transmitting unit of transmitting said two or more sequences of fixed-pattern-added low-speed data to a network on a receive side.

7. A data transmission system for transmitting a high-speed data signal, in which two or more high-speed data are disposed and separated by no-signal intervals each having a predetermined data length, from a transmitting system connected to a network to a receiving system connected to another network,

said transmitting system including a data dividing unit for dividing each of said two or more data into two or more low-speed data so as to create two or more sequences of low-speed data which are separated by no-signal intervals each having the predetermined data length, and a fixed-pattern adding unit for adding a fixed pattern for detecting a head or an end of each low-speed data included in each of said two or more sequences of low-speed data to each of said no-signal intervals included in each of said two or more sequences of low-speed data so as to create two or more sequences of fixed-pattern-added low-speed data,

and said receiving system including a receiving unit for receiving said two or more sequences of fixed-pattern-added low-speed data, a fixed pattern removing means for removing the fixed patterns from each fixed-pattern-added low-speed data included in each of said two or more sequences of fixed-pattern-added low-speed data so as to extract said two or more sequences of low-speed data, and a reproducing means for reproducing said two or more high-speed data from said two or more sequences of low-speed data extracted by said fixed pattern removing means, and for sending out said two or more high-speed data onto said other network.

8. The data transmission system according to claim 7, wherein said network is disposed in a station and said other network is disposed in a train which stops at or passes the station.