JPH05219134A - Time division transmission system - Google Patents

Abstract

PURPOSE:To increase transmission quantity by adding a channel as occasion demands. CONSTITUTION:In the case of increasing the transmission quantity, a prescribed control signal is given to switching circuit parts 3, 8 so as to make them select the data of a D2 channel and the output data of a D2 channel reception circuit part 7 respectively. The D1 channel transmission circuit part 1 of a master side transmits the data of a D1 channel to a transmission line 9 at first, and next, a B1/B2 channel transmission circuit part 2 transmits the data of a B1 and a B2 channels successively to the transmission line 9. After that, a D2 channel transmission circuit part 4 transmits the data of the D2 channel from the switching circuit 3. The D1 channel reception circuit part 5 and the B1/B2 channel reception circuit part 6 of a slave side receive the data of the D1 channel and the B1/B2 channel from the transmission line 9, and output them. After that, the D2 channel reception circuit part 7 receives the data of the D2 channel from the transmission line 9, and the switching circuit 8 receives this data, and outputs it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for transmitting data in a time division manner through a transmission line.

[0002]

2. Description of the Related Art In a conventional time division transmission system for transmitting data in a time division manner through a transmission line, a D1 channel and a B1 channel are used.
Data was transmitted only through the channel and three channels of the B2 channel.

[0003]

That is, since the number of channels has been fixed in the past, it was impossible to increase the transmission amount any more.

An object of the present invention is to provide a time division transmission system which eliminates such drawbacks and increases the amount of transmission by adding channels as needed.

[0005]

SUMMARY OF THE INVENTION In a system for transmitting data in a time division manner through a transmission line, the present invention provides a D1 channel transmission circuit section for transmitting D1 channel data to the transmission line, B1 channel data and B2 channel. B1 / B2 channel sending circuit section for sending the data of the D1 channel to the transmission path, a D2 channel sending circuit section for sending the D2 channel data to the transmission path when a predetermined control signal is given, and a D1 channel data D received from the road
1-channel receiving circuit unit and B1 / B2 for receiving B1 channel data and B2 channel data from the transmission path
It is characterized by comprising a channel receiving circuit section and a D2 channel receiving circuit section for receiving D2 channel data from a transmission line when a predetermined control signal is given.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of a time division transmission system according to the present invention. However, only one station is shown in the figure. Actually, a device having the same configuration as the device shown in FIG. 1 is connected to the device of FIG. 1 through a transmission line. The device of FIG. 1 is a master, and the other device is a slave.

In the figure, a D1 channel sending circuit unit 1
Receives the data of the D1 channel and sends it to the transmission line 9
To send to. The B1 / B2 channel sending circuit unit 2 is
The channel data and the B2 channel data are received and sent to the transmission line 9. The D2 channel transmission circuit unit 4 receives data from the switching circuit unit 3 described later and transmits it to the transmission line 9. Switching circuit unit 3
Selects either the input D2 channel data or zero data based on the control signal.
It is given to the channel sending circuit unit 4.

On the other hand, the D1 channel receiving circuit section 5 receives and outputs the D1 channel data from the transmission line 9. B
The 1 / B2 channel receiving circuit unit 6 receives the B1 channel data and the B2 channel data from the transmission line 9,
Output. The D2 channel receiving circuit unit 7 receives and outputs the D2 channel data from the transmission line 9. The switching circuit unit 8 selects either the input D2 channel data from the D2 channel receiving circuit unit 7 or the zero data based on the control signal and outputs it.

Next, the operation will be described. When it is not necessary to increase the transmission amount, a predetermined control signal is given to the switching circuit units 3 and 8 to select zero data. At this time, as shown in the timing chart of FIG. 2, the D1 channel sending circuit unit 1 on the master side first sends the data of the D1 channel to the transmission line 9, and then the B1 / B2 channel sending circuit unit 2 makes the B1 channel. Data and B2 channel data are sequentially transmitted to the transmission line 9. After that, the D2 channel sending circuit unit 4 sends the zero data from the switching circuit unit 3 to the transmission line 9.

These data are, after a certain transmission line delay,
The data is transmitted to the slave side, and the D1 channel receiving circuit unit 5 on the slave side first receives and outputs the data of the D1 channel from the transmission line 9, and then the B1 / B2 channel receiving circuit unit 6
Sequentially receives and outputs the data of the B1 channel and the data of the B2 channel from the transmission line 9. In this case, since the switching circuit 8 selects the zero data, the switching circuit 8 outputs the zero data.

Then, after a predetermined guard time, this time from the slave side to the master side, D1, B1 and B are similarly set.
The data of each of the two channels are sequentially transmitted, and the master side sequentially receives them. After that, data transmission is performed by repeating such operation as one cycle.

On the other hand, when it is necessary to increase the transmission amount, a predetermined control signal is given to the switching circuit units 3 and 8 to select the data of the D2 channel and the output data of the D2 channel receiving circuit unit 7, respectively. At this time, as shown in the timing chart of FIG.
The 1-channel transmission circuit unit 1 first transmits the D1 channel data to the transmission line 9, and then the B1 / B2 channel transmission circuit unit 2 sequentially transmits the B1 channel data and the B2 channel data to the transmission line 9. To do. After that, the D2 channel transmission circuit unit 4 transmits the D2 channel data from the switching circuit unit 3 to the transmission line 9.

These data are, after a certain transmission line delay,
The data is transmitted to the slave side, and the D1 channel receiving circuit unit 5 on the slave side first receives and outputs the data of the D1 channel from the transmission line 9, and then the B1 / B2 channel receiving circuit unit 6
Sequentially receives and outputs the B1 channel data and the B2 channel data from the transmission line 9. After that, the D2 channel receiving circuit unit 7 receives the D2 channel data from the transmission line 9, and in this case, the switching circuit 8 selects the output data of the D2 channel receiving circuit unit 7, so the switching circuit 8 receives the data. The circuit unit 7 outputs the received D2 channel data. When the predetermined guard time elapses,
Next, from the slave side to the master side in the same way, D1, B
Data of each channel of 1, B2, D2 is transmitted sequentially,
The master side receives them sequentially. After that, data transmission is performed by repeating such operation as one cycle.

[0014]

As described above, according to the present invention, in a system for transmitting data in a time division manner through a transmission line, D
When a D1 channel sending circuit unit for sending 1-channel data to the transmission line, a B1 / B2 channel sending circuit unit for sending B1 channel data and B2 channel data to the transmission line, and a predetermined control signal are given , D
A D2 channel sending circuit unit for sending 2-channel data to the transmission line, a D1 channel receiving circuit unit for receiving D1 channel data from the transmission line, and a B1 channel for receiving B1 channel data and B2 channel data from the transmission line. /
It is characterized by comprising a B2 channel receiving circuit section and a D2 channel receiving circuit section for receiving D2 channel data from a transmission line when a predetermined control signal is given.

Therefore, in the time division data transmission system of the present invention, when a predetermined control signal is given to the D2 channel sending circuit section and the D2 channel receiving circuit section, D
In addition to the data of each channel of B1, B1 and B2, the data of the D2 channel can be transmitted, and the transmission amount of data can be increased as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a time division data transmission system according to the present invention.

FIG. 2 is a timing chart for explaining the operation of the time division data transmission system of FIG.

FIG. 3 is another timing chart for explaining the operation of the time division data transmission system of FIG.

[Explanation of symbols]

 1 D1 channel sending circuit unit 2 B1, B2 channel sending circuit unit 3, 8 Switching circuit unit 4 D2 channel sending circuit unit 5 D1 channel receiving circuit unit 6 B1 / B2 channel receiving circuit unit 7 D2 channel receiving circuit unit 9 Transmission path

Claims (3)

[Claims] 1. A system for transmitting data in a time division manner through a transmission line, a D1 channel transmission circuit unit for transmitting D1 channel data to the transmission line, and transmitting B1 channel data and B2 channel data to the transmission line. B1 / B2 channel sending circuit section, D2 channel sending circuit section sending out D2 channel data to a transmission path when a predetermined control signal is given, and D1 channel receiving circuit receiving D1 channel data from the transmission path Section, a B1 / B2 channel receiving circuit section for receiving B1 channel data and B2 channel data from a transmission path, and a D2 channel receiving section for receiving D2 channel data from a transmission path when a predetermined control signal is given. A time-division transmission system comprising a circuit section. 2. The D2 channel sending circuit section receives a data sending circuit section for sending the input data to a transmission line, D2 channel data, and data indicating that the D2 channel data is zero. When the first control signal is applied, the former data is output to the data transmission circuit section, and when the second control signal is applied, the latter data is output to the data transmission circuit section. And a switching circuit section for receiving the data of the D2 channel from the transmission line, the data of the D2 channel received by the data receiving circuit section, and the D2 channel. When the first control signal is given, the former data is output to the data receiving circuit section. When the second control signal is supplied, division transmission system time according to claim 1, characterized in that a second switching circuit for outputting the latter data to the data reception circuit section. 3. The D2 channel transmission circuit section is provided with the D1 channel.
The channel sending circuit unit and the B1 / B2 channel sending circuit unit send the data to the transmission line, and then send the data to the transmission line. The time division transmission system according to claim 1, wherein the channel receiving circuit unit receives the data from the transmission line and then receives the data from the transmission line.