JPH0342838B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a digital data dedicated machine,
The present invention relates to a branch connection device for performing multipoint communication.

[Conventional technology]

In a digital data dedicated line, data and control signals are transmitted in envelope units. 1st
The figure is a bit configuration diagram of the envelope, where F is a framing bit, _D1 to _D6 are data bits, and S is a stator bit on which control signals are multiplexed.

In order to realize the multi-point communication function, the branch connection device monitors the state of status bits to control the blocking and passing of data between multiple lines in envelope units.

Conventional branch connection equipment has a control information memory that holds control information for blocking and passing data for each line group that performs multipoint communication, and the control information in this information memory and the current state from the status bits of the current envelope. The device was equipped with a connection control circuit that creates control information for the envelope, and a connection switch that uses this control information to block or pass data.

FIG. 2 is a configuration diagram of a conventional branch connection device with three branches, in which input terminals a, b, c and output terminals a', b', c' are connected to a connection switch 15.
This connection switch is connected to the connection control circuit 12 by a control line. This connection control circuit 12 is connected to an input terminal side line and a control information memory 13 by a control line.

The operation of the device will be explained below.

Data input to input terminals a, b, and c are either blocked by the state of the status bits in envelope units, or are connected to output terminals a', b', and c' and branched. For example, input terminal a,
If all status bits of b, c are off, all data is blocked and output terminals a', b',
No signal is connected to c′. If only the status bit of input terminal a turns on,
This terminal is determined to be the main station, and the connection switch 15
Data at input terminal a is output to output terminals b' and c'. Next, if the status bit of input terminal b turns on while the status bit of input terminal a remains on, this terminal is determined to be the slave station that made the connection request, and the connection switch 15 connects input terminal b to the slave station. Connect to output terminal a′. Remaining as it was until now,
Next, even if the status bit of input terminal c is turned on, since a connection has already been made between the master station and the slave station, data at input terminal c is blocked. In this way, this branch connection device performed multipoint communication.

FIG. 3 is an example of a connection between a conventional branch connection device and a time-division line editing device. Data from terminals 1 to 6 is connected to a time division line editing device comprising a multiplexing circuit 7, a demultiplexing circuit 8 and a time division switch 9. The time division line editing device connects each terminal to the branch connection device, but since the input and output of the time division switch is in the time division multiplex format, it cannot be directly connected to the conventional branch connection devices 18 and 19.

Therefore, a branch connection device separation circuit 17 is provided on the output side for the branch connection device of the time division switch, and this circuit separates the branch connection device 1 into terminals.
8 and 19. Similarly, branch connection device 1
The signals g to l from the outputs of 8 and 19 are converted into a time division multiplex format by the branch connection circuit multiplexing circuit 16 and input to the time division switch 9. Here, terminals 1 to 3 are connected to the branch connection device 18, and terminals 4 to 3 are connected to the branch connection device 18.
6 are accommodated in the branch connection device 19, and each constitute a branch line. The symbols a to l attached to the connection lines in FIG. 3 indicate that signals from the same terminal are passed when the symbols are the same.

[Problem that the invention seeks to solve]

In such a conventional branch connection device, in order to connect with a time-sharing type line editing device, it is necessary to add a demultiplexing circuit and a multiplexing circuit to the line editing device, and it is also necessary to add a demultiplexing circuit and a multiplexing circuit to the line editing device. This method requires as many branch connection devices as the number of line groups to be processed, and also has the disadvantage that the wiring between the branch connection devices and the line editing device is done on a line-by-line basis.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional branch and connection devices by allowing the main parts of one branch and connection device to be shared among a plurality of branch line groups by time division multiplexing.

[Means for solving problems]

The present invention is a device that is inserted between a plurality of terminals that performs multipoint communication of digital data in envelope units,
A branch connection device that includes a multiplexing circuit, a time division switch, and a separation circuit, and is used when connected to a time division editing device.As a means of solving the above-mentioned problems, it is a branch connection device that includes a multiplexing circuit, a time division switch, and a separation circuit. A register that temporarily holds each envelope, a connection control circuit that creates control information for the current envelope from the status bits on the above registers and past control information in the control information memory, and a connection control circuit that uses this control information to block data and control connections. It is equipped with a connection switch that performs a switching operation, a control information memory that stores past control information for each branch line, and an address generation circuit that identifies between a plurality of branch lines, and includes the register, the connection control circuit, and the connection control circuit. It is characterized in that the switch is configured to be shared between multiple branch lines.

[Effect]

The device of the present invention is designed to connect one branch line to another in order to share the device with one device, whereas conventional devices were provided for each branch line group when performing branch connections in a digital data multi-point communication network. Envelopes input from the group's terminals through the multiplexing circuit and time-division switch of the time-division editing device are temporarily held in a register, and the connection control circuit stores the past information of that branch circuit in the control information memory. Connection information for a branch connection for the current envelope is created from the control information for the envelope and the status bits of past envelopes in the register. This control information is stored in the control information memory for each branch circuit, and this information is used to block and connect the connection switch, separating the envelope held in the register from the time division switch of the time division editing device. It is characterized in that it is configured to be branch-connected to a terminal via a circuit, and includes an address generation circuit that generates an address in a control information memory in order to identify between branch circuits.

With this device, conventional branch connection devices required as many branch connection devices as the number of branch line groups, it was necessary to add a separation circuit and a multiplexing circuit to the line editing device, and the branch connection device was The disadvantages of requiring wiring for each line between line editing devices are solved at once.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below based on the drawings.

FIG. 4 is a block diagram of a device according to an embodiment of the present invention. The terminals 1 to 3 and 4 to 6 are connected to the input side of a branch connection device 10 via a multiplexing circuit 7 and a time division switch 9, and the output side of the branch connection device 10 is connected to the time division switch 9 and a separation circuit. 8 to terminals 1-3 and 4-6.
Inside the branch connection device 10, the input side of this device is connected via a register 11 and a connection switch 15 to the output side of the device, and the register 11 is connected to the connection switch 15 via a connection control circuit 12. The connection control circuit 12 and the control information memory 13 are connected for mutual input/output. Further, the address generation circuit 14 is connected to the control information memory 13.

FIG. 5 is an explanatory diagram of time division multiplexing, with symbol 1
.about.6 correspond to input/output data of terminals 1 to 6 in FIG. Data from the terminal is multiplexed or demultiplexed into frame T1 for data _1, frame T2 for data ₂ , and frame _T3 for data 3 in envelope units, and are connected to a time division switch.

FIG. 6 is an explanatory diagram of data strings of input e and output f of the branch connection device 10 in FIG.
Each input/output data of terminals 1 to 3 is a frame.
Corresponds to data of T ₁ , T ₂ , and T ₃ . flame
The data of T _1-1 , T _2-1 , and T _3-1 are each frame
Corresponds to the previous input/output data of T ₁ , T ₂ , and T ₃ .

An overview of the functions of the apparatus shown in FIG. 4 will be explained below. Transmission data from terminals 1 to 3 and 4 to 6 is time-division multiplexed in envelope units by multiplexing circuit 7 and input to time-division switch 9 .
The transmission data is time-divisionally switched by the time-division switch 9 and transmitted to the branch connection device 10. The output of the branching and connecting device 10 is time-divisionally switched by a time-division switch 9 in a time-division multiplex format, and separated into data for each terminal by a demultiplexing circuit 8, which becomes input data for the terminals 1-3 and 4-6.

Next, the operation of the branch connection device will be explained based on FIGS. 4, 5, and 6. Frame T ₁ , T ₂ ,
The data of _T3 is temporarily held in the register 11. In the connection control circuit 12, the previous frame
Data for the current envelope is obtained from the control information in the control information memory 13 that stores control information for the data of T _1-1 , T _2-1 , and T _3-1 and the current status bits held in the register 11. Create control information for branching and connections. This control information is stored in the control information memory 13, controls the connection switch 15, outputs the data held in the register 11 to the time division switch 9, and performs branch connection. Address generation circuit 14
, generates the address of the control information memory 13,
Identifies branch lines.

By the way, in the branch connection device 10, the input e
If the status bits of the data in frames T ₁ , T ₂ , T ₃ are all off, all data is blocked and nothing is output to frames T ₁ , T ₂ , T ₃ of output f. Next, if only the status bit of frame _T1 of input e is turned on, this terminal is determined to be the master station, and the connection switch 15 transfers the data of frame _T1 of input e to frame _T2 and frame of output f. Output to _T3 . Next, the frame of input e
The status bit of the T ₁ data remains on,
If the status bit of the data in frame _T2 of input e is turned on, this terminal is determined to be the slave station that has made the connection request, and the connection switch 15 transfers the data of frame _T2 of input e to frame T of output f. Output to ₁ . If the status remains as it is, even if the status bit of the data in frame T ₃ of input e turns on, the connection between the master station and slave station has already been established, so the data will go to frame T ₃ of input e. output is blocked. In this way, multipoint communication can be performed between the terminals 1, 2, and 3.

As explained above, the connection control circuit 12, register 11, and connection switch 15 that constitute the branch connection device 10 are one circuit that controls multipoint communication between a plurality of terminals using a time-division data processing method. It can be carried out.

〔Effect of the invention〕

According to the present invention, by sharing one branch control circuit, register, and connection switch for a plurality of branch lines, the space factor per branch line is good, the cost is low, and line editing is performed in a time-sharing manner. It is possible to provide a branch connection device that is easy to connect to devices.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an envelope. FIG. 2 is a block diagram of a conventional branch connection device. FIG. 3 is a block configuration diagram showing a connection between a conventional branch connection device and a time division line editing device. FIG. 4 is a block diagram of a device according to an embodiment of the present invention. FIG. 5 is an explanatory diagram of time division multiplexing. FIG. 6 is an explanatory diagram of input and output data strings of the branch connection device of FIG. 4. 1 to 6... terminal, 7, 16... multiplexing circuit,
8, 17... Separation circuit, 9... Time division switch, 10... Branch connection device, 11... Register,
12...Connection control circuit, 13...Control information memory, 14...Address generation circuit, 15...Connection switch.

Claims (1)

[Scope of Claims] 1. A device that is inserted between a plurality of terminals that perform multipoint communication of digital data in envelope units, includes a multiplexing circuit, a time division switch, and a separation circuit, and is connected to a time division editing device. The branch connection equipment used has a register that temporarily holds branch line data and status bits in each envelope, and a register that creates control information for the current envelope from the status bits on the register and past control information in the control information memory. A control circuit, a connection switch that blocks data and switches connections based on this control information, a control information memory that stores past control information for each branch line, and an address generator that identifies multiple branch lines. A branch connection device comprising: a circuit, wherein the register, the connection control circuit, and the connection switch are shared between a plurality of branch lines.