JP2002009872A - Data transmitting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem such that communication is impossible in a conven tional data transmitting system since the constitutions of transmission lines differ and the formats of data differ if the transmitting devices of different systems are connected and data is to be transmitted between terminals. SOLUTION: The transmitting device 1 transmitting data to which are information byte is added to every data word by a duplexed transmitting line and the transmitting device 2 transmitting data constituted only of the data word by the simplex transmission line are connected through an interface 10. The interface 10 deletes or adds the information byte and it is adjusted to the system of outputted data of the transmitting device. Thus, data transmission between the transmitting devices different in the systems is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system configured to perform data transmission between transmission apparatuses of different systems.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a conventional data transmission apparatus. In FIG. 11, 1 is a transmission device, 3 is a node device that is connected via a double optical transmission line, processes data of a terminal, and 4 is an optical fiber cable,
A double transmission line 5 that enables data transmission even if one of the terminals is disconnected is a terminal connected to the node device 3. Figure 1
2 is a configuration diagram showing another conventional data transmission device.
In FIG. 12, 2 is a transmission device, 7 is a node device that performs data processing, 8 is a single transmission line composed of optical fibers, and 9 is a terminal connected to the node device 7.

The format of data transmitted by the transmission apparatus 1 shown in FIG. 11 has a configuration as shown in FIG. 2, in which one byte of information (data word) output by each terminal 5 corresponds to one byte of information. Bytes are appended. Figure 1
The format of the data transmitted by the transmission device 2 shown in FIG. The transmission device 1 and the transmission device 2 perform data transmission between terminals in the respective data transmission devices.

As techniques related to such a conventional transmission apparatus, Japanese Patent Application Laid-Open No.
No. 172448.

[0005]

The above-mentioned prior art has the following problems. Even if the transmission apparatus 1 and the transmission apparatus 2 are connected to perform data transmission between the terminal 5 and the terminal 9, the communication is performed because the transmission paths 4 and 8 have different configurations and the data formats are different. Was impossible.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data transmission system in which data transmission apparatuses having different configurations are connected to each other so as to be able to transmit and extend a communication network.

[0007]

A data transmission system according to the present invention has a plurality of first node devices connected by a first transmission line, and one information byte is added to each data word. A first transmission device that transmits the first data between the first node devices, and a plurality of second node devices connected by a second transmission path, and includes only data words. A second transmission device for transmitting the second data between the second node devices; and a plurality of first transmission devices connected to one of the plurality of second node devices and connected via the first transmission path. An interface unit connected to one of the node devices,
The first data is converted into second data by deleting information bytes from the first data, and the first data is converted into first data by adding information bytes to the second data.

A transmission line connected to the plurality of second transmission devices via the interface unit and selecting one of the plurality of second transmission devices and connecting to the first transmission device. It has a selection unit. Also, the interface unit counts the number of bytes of the data word of the second data converted from the first data,
It has an information byte position detector for detecting the position of the information byte.

Further, when the signaling information is included in the information byte of the first data, the interface unit converts the signaling information into the last bit of the data word and converts it into the second data. The information byte of the first data includes information indicating the presence or absence of signaling information.

The first transmission line is a duplicated transmission line, and the interface unit includes an information byte verification unit for verifying information bytes of the first data transmitted from the first transmission device. The first data of one of the duplicated transmission lines is selected according to the test result of the information byte verification unit. Furthermore, the interface unit has a state machine for processing the test result of the information byte test unit.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram showing a data transmission system according to Embodiment 1 of the present invention. In FIG. 1, 1 is a transmission device (first transmission device), 2 is a transmission device (second transmission device), 3 is a general node device (first node device) in the transmission device 1, 4
Is a transmission line (first transmission line) of the transmission device 1 which is double-configured using an optical fiber cable, 5 is a terminal connected to each node device 3, and 7 is a general node device in the transmission device 2 ( Reference numeral 8 denotes a single transmission line (second transmission line) constituted by the optical fiber cable of the transmission device 2, and reference numeral 9 denotes a terminal connected to each node device 7. 1
Reference numeral 0 denotes an interface unit connected to the node device 7 and connected to the node device 3 via the transmission path 4.

The transmission device 1 transmits first data having a configuration in which one byte of information bytes is added to each data word as shown in FIG. The transmission device 2 transmits the second data composed only of the data word without the information byte. FIG. 2 is a diagram showing a data format of the data transmission device according to the first embodiment of the present invention.
FIG. 2 shows a structure in which one data word is added with one information byte at the end thereof, regardless of the data size. FIG. 3 is a configuration diagram of the information byte in FIG. In FIG. 3, bit 0 is FAIS indicating a transmission line abnormality, bit 1 is ST for transmitting signaling, bit 2 is RV (not used), bit 3 is S for transmitting a request signal, and bit 4 is AV (not used). , Bit 5 for detecting a bit error, bit 6 for BAIS for transmitting a game alarm, and bit 7 for P for transmitting data parity.

FIG. 4 is a configuration diagram showing an interface unit of the data transmission system according to the first embodiment of the present invention.
In FIG. 4, reference numeral 4 denotes a duplicated transmission line, 7 denotes a node device of the transmission device 2, and 11 converts an optical signal input through the transmission line 4 into an electric signal for each of the double transmission lines 4. An O / E conversion unit, 12 is an information byte deletion unit that deletes information bytes from data converted from an optical signal to an electric signal input via the transmission line 4, and 13 is an information byte position indicating the position of the information byte An instruction unit, 14 is a transmission line
An information byte verification unit for verifying an information byte of data converted from an optical signal to an electric signal input through the interface, and outputs a signal for switching to another system when an error occurs. Reference numeral 15 denotes a selection unit that selects data to be output to the data bus based on a signal from the information byte verification unit 14, and 16 denotes an output instruction unit that generates an output instruction from a data word identification signal. 17 is an indicating unit for indicating a data word, 18
Is an information byte adding unit for adding an information byte to the data from the data bus 18;
Reference numeral 0 denotes an E / O conversion unit that converts the data to which the information byte has been added by the information byte addition unit 19 from an electric signal to an optical signal and outputs the converted signal to the transmission line 4.

Next, the operation will be described. The optical signal from the optical transmission line 4 in FIG. 1 is converted by the O / E converter 11 into an electric signal for each of the double transmission lines. The converted electric signal is input to the information byte deletion unit 12, and the information byte added to the last part of the data word is deleted. The position of the information byte is output from the information byte position indicating unit 13 by setting, for example, information byte = 1 and data = 0 for each byte by software.
The information byte of the converted electric signal is examined by the information byte examining unit 14 to determine which data of the two transmission paths 4 should be selected for the data word to be output to the data bus 18. In accordance therewith, the selection unit 15 selects data. As the selected data, only the data word specified by the instruction unit 17 is output to the data bus 18 by the output instruction signal generated by the output instruction unit 16 from the identification signal of the data word.

Conversely, data from data bus 18 is:
An information byte is generated and added by the information byte adding unit 19, and is output to two E / O conversion units 20. The E / O conversion unit 20 converts the data (electric signal) from the information byte addition unit 19 into an optical signal and outputs the optical signal to each of the two transmission paths 4. In the first embodiment, the data bus 18 generally used for connecting the node device and the terminal includes:
By connecting the interface unit shown in FIG. 4,
Perform communication between different transmission devices.

According to the first embodiment, it is possible to perform data transmission between two types of data transmission devices having different systems without changing the data transmission device.

Embodiment 2 FIG. In the first embodiment, the signal indicating the position of the information byte is generated by setting software, but the second embodiment relates to a method of generating the information byte without using software. FIG. 5 is a configuration diagram showing an interface unit of the data transmission system according to the second embodiment of the present invention. In FIG. 5, 4, 7, 1
1, 12, 14 to 20 are the same as those in FIG. Reference numeral 22 denotes a change point detection unit that detects a change point of the data word identification signal, 23 denotes an address count unit that counts the address of a memory that stores the data word, and 24 denotes a byte number count unit that counts the number of bytes of the data word. . 25 is a memory for holding the number of bytes of each data word, 26 is a byte number counting unit for counting the number of bytes of the data word + 1, and 27 is an address counting unit for counting the address of the data word counted by the byte number counting unit 26. is there. 22 to 27 constitute an information byte position detecting unit.

As shown in FIG. 5, a change point of the data word identification signal is detected by the change point detection unit 22 from the data input from the optical transmission line 4 and output to the data bus 18, whereby the address is determined. The count unit 23 and the byte count unit 24 count the address and the number of bytes, and hold the number of bytes of each data word in the memory 25. Based on the value held in the memory 25, the address count unit 27 and the byte count unit 26 output each data word configuration as the number of bytes + 1, and output the last part as an information byte position.

In the second embodiment, there is an effect that software for designating an information byte position is not required, and it is not necessary to reset when a data word changes.

Embodiment 3 Embodiment 3 relates to transmission of signaling. Signaling is a signal for transmitting telephone on-hook / off-hook information. FIG. 6 is a diagram showing data processing in the interface unit of the data transmission system according to the third embodiment of the present invention. FIG. 7 is a diagram showing data processing in a terminal of the data transmission system according to the third embodiment of the present invention.

In the transmission device 1, signaling transmission is performed by:
This is performed by bit 1 (ST) of the information byte shown in FIG. On the other hand, in the transmission device 2, signaling is transmitted once in a plurality of frames, and LSB (Least Significance) of data is transmitted.
ficant Bit). Therefore, in order to perform communication between the transmission device 1 and the transmission device 2, transmission is performed by the following method. When transmitting the data from the transmission path to the data bus (from the transmission device 1 to the transmission device 2), as shown in FIG. 6, the bits of the information byte ST are set at the end of the data word in the interface section. The output is replaced with the LSB of the data. At this time, in the terminal of the transmission apparatus 1, the terminal using the signaling puts a signaling signal on the information byte ST of the data word of the own station, and the terminal not using the signaling, as shown in FIG. The LSB of the last part of the data (one byte before the information byte) is transmitted on the information byte ST.

At the time of transmission from the data bus to the transmission path side (from the transmission device 2 to the transmission device 1), signaling by replacing data for each of a plurality of frames is placed in the information byte ST by the interface unit. In the transmission device 1, the terminal using the signaling uses the ST of the transmitted information byte.

According to the third embodiment, communication between terminals between transmission apparatuses of different systems requiring signaling transmission is also possible.

Embodiment 4 Embodiment 3 describes a signaling transmission method, but Embodiment 4 relates to another signaling transmission method. FIG.
FIG. 14 is a diagram showing processing of information bytes in the data transmission system according to the fourth embodiment of the present invention. When transmitting signaling from the transmission device 1 to the transmission device 2, the information byte ST
In addition, the information byte R which was not used in the fourth embodiment
Transmit using V. As shown in FIG.
When the terminal outputs the signaling, the value of the RV of the information byte carrying the signaling to the ST is set to “1”,
Otherwise, the value of RV is set to “0”. The interface unit replaces the LSB of the data with ST when the value of RV is “1”, and transmits the data as it is when the value of RV is “0”.

According to the fourth embodiment, a terminal that does not use the signaling of the transmission device 1 can perform signaling transmission between the transmission device 1 and the transmission device 2 without adding new processing.

Embodiment 5 In the first embodiment, when performing the information byte test, there is no place to hold the test result, so that the process itself needs to be considerably limited, such as immediately performing a process such as transmission path selection based on the result. In the fifth embodiment, a description will be given of a method of expanding a processing capacity by connecting a state machine based on a test result for each data word to an information byte test unit in an information byte test.

FIG. 9 is a configuration diagram showing an interface unit of a data transmission device according to a fifth embodiment of the present invention.
In FIG. 9, 4, 7, 11 to 20 are the same as those in FIG. 29 is a state machine, and 30 is a memory for holding a state. In the data transmission system configured as described above, the state machine 29 is operated based on the test result of the information byte test unit 14 for each data word and the state up to the previous frame read from the memory 30 to advance. The state is written to the memory 30. The transmission path selection process is performed based on the state.

According to the fifth embodiment, for example, when the error is 3
Complex processing such as processing for switching the transmission path when frames or more occur consecutively is possible, and the processing capability can be expanded.

Embodiment 6 FIG. The sixth embodiment relates to a case where a plurality of transmission devices 2 are connected to the transmission device 1 according to the first embodiment. FIG. 10 is a configuration diagram showing a data transmission device according to the sixth embodiment of the present invention. In FIG. 10, 1 to 10 are the same as those in FIG. Reference numeral 31 denotes a transmission path selection unit for selecting the transmission path 4, to which a plurality of transmission paths 4 to which the transmission apparatus 2 is connected are connected. A transmission line setting unit 32 sets the transmission line selected by the transmission line selection unit 31. FIG.
Then, the transmission path setting unit 32 sets which transmission path 4 among the plurality of transmission paths 4 is to be selected.
The transmission path 4 set in the transmission path setting unit 32
Is selected to connect to the node device 4 of the transmission device 1.

According to the sixth embodiment, it is possible to connect a plurality of transmission devices, and it is possible to easily expand the transmission devices.

[0031]

Since the present invention is configured as described above, it has the following effects. A first node device that has a plurality of first node devices connected by a first transmission path and that transmits first data to which one byte of information byte is added for each data word between the first node devices; A second transmission device that has a transmission device and a plurality of second node devices connected by a second transmission path, and that transmits second data including only data words between the second node devices. And an interface unit connected to one of the plurality of second node devices and connected to one of the plurality of first node devices via the first transmission line. Is configured to delete the information byte from the first data and convert it to the second data, and to add the information byte to the second data and convert it to the first data. Data transmission between different transmission devices It can be.

A transmission line connected to the plurality of second transmission devices via the interface unit and selecting one of the plurality of second transmission devices and connecting to the first transmission device. Since the selection unit is provided, a plurality of transmission devices can be connected to perform data transmission. The interface unit has an information byte position detection unit that detects the position of the information byte by counting the number of bytes of the data word of the second data converted from the first data. The instructions can be provided by hardware.

Furthermore, when the information byte of the first data contains signaling information, the interface unit converts the signaling information into the last bit of the data word and converts it into the second data. Signaling can be transmitted between the transmission devices. In addition, since the information byte of the first data includes information indicating the presence or absence of signaling information, it is possible to determine the presence or absence of signaling information.

The first transmission line is a duplicated transmission line, and the interface unit includes an information byte verification unit for verifying the information byte of the first data transmitted from the first transmission device. Since the first data of one of the duplexed transmission paths is selected according to the test result of the information byte verification unit, the transmission path for each data word can be selected. Furthermore, since the interface unit has a state machine that processes the test result of the information byte test unit, it is possible to perform complicated processing of the test result.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a data transmission system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a data format of a data transmission device according to the related art and the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an information byte of FIG. 2;

FIG. 4 is a configuration diagram illustrating an interface unit of the data transmission system according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram showing an interface unit of a data transmission system according to a second embodiment of the present invention.

FIG. 6 is a diagram showing data processing in an interface unit of a data transmission system according to a third embodiment of the present invention.

FIG. 7 is a diagram showing data processing in a terminal of the data transmission system according to the third embodiment of the present invention.

FIG. 8 is a diagram illustrating processing of an information byte in a data transmission system according to a fourth embodiment of the present invention.

FIG. 9 is a configuration diagram illustrating an interface unit of a data transmission device according to a fifth embodiment of the present invention.

FIG. 10 is a configuration diagram illustrating a data transmission device according to a sixth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a conventional data transmission device.

FIG. 12 is a configuration diagram showing another conventional data transmission device.

[Explanation of symbols]

1, 2 transmission device, 3, 7 node device, 4, 8 transmission line, 9 terminal, 10 interface unit, 11 O / E
Conversion section, 12 information byte deletion section, 13 information byte indication section, 14 information byte verification section, 15 selection section, 16
Output instruction unit, 17 instruction unit, 18 data bus, 19
Information byte adding section, 20 E / O conversion section, 22 change point detecting section, 23, 27 address counting section, 24, 26
Byte count section, 25, 30 memories, 29 state machines.

Claims (7)

[Claims] An apparatus comprising: a plurality of first node devices connected by a first transmission line, wherein first data to which one byte of information byte is added for each data word is transmitted between the first node devices. The first transmission device to transmit in, having a plurality of second node devices connected by a second transmission path, between the second node device the second data composed only of the data word A second transmission device for transmitting, connected to one of the plurality of second node devices and connected to one of the plurality of first node devices via a first transmission path. The interface unit converts the first data by deleting information bytes from the first data and converting the first data into second data, and adding the information bytes to the second data and converting the first data into first data. Data characterized by being configured in Data transmission system. 2. A transmission connected to a plurality of second transmission devices via an interface unit and selecting one of the plurality of second transmission devices and connecting to the first transmission device. The data transmission system according to claim 1, further comprising a route selection unit. 3. An information byte position detector for detecting a position of an information byte by counting the number of bytes of a data word of the second data converted from the first data. Claim 1
Alternatively, the data transmission system according to claim 2. 4. When the information byte of the first data includes signaling information, the interface unit replaces the signaling information with the last bit of the data word and converts the signaling information into the second data. Claim 1
The data transmission system according to claim 3. 5. The data transmission system according to claim 4, wherein the information byte of the first data includes information indicating the presence or absence of signaling information. 6. The first transmission line is a duplicated transmission line, and the interface unit includes an information byte verification unit that verifies information bytes of first data transmitted from the first transmission device. 6. The method according to claim 1, wherein the first data of one of the duplexed transmission paths is selected according to a test result of the information byte verification unit. Data transmission system according to the item. 7. The data transmission system according to claim 6, wherein the interface unit has a state machine that processes a test result of the information byte test unit.