JPS5819178B2 - Timing control method in burst type transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timing control method in a burst type transmission method.

The transmitted signal is divided into fixed periods, and the signals of each fixed period are time-compressed before being transmitted, expanded to the original width at the receiving station to obtain the T signal, and the remaining time is processed in the same manner to transmit signals from other stations. The burst-type transmission method for transmitting signals has advantages such as being able to perform multiplex communication on a single transmission line and avoiding near-end crosstalk between transmission lines.

In such a transmission method, it is possible to transmit and receive signals only by knowing in advance the position of the burst signal to be received and the position of the burst signal to be transmitted. The disadvantage is that the circuit is complicated.

An object of the present invention is to provide a timing control system that can perform both transmission and reception while eliminating interference with burst signals in a burst transmission system using a simple configuration.

Examples will be described in detail below.

. . FIG. 1 is a block diagram showing a configuration example of a communication device to which the burst synchronization control method of the present invention is applied.

In the figure, 1 is a timing generation circuit, 2 is a transmission signal generation circuit, 3 is a reception circuit, 4 is a switch control circuit, 5 is a transmission switch, 6 is a reception switch, 7 is a coincidence detection circuit,
8 is a synchronous circuit, 9 is a transmission line, 10 is a transmission signal input terminal,
11 is a received signal output terminal.

The transmission signal from the transmission signal input terminal 10 is time-compressed by the transmission burst pulse from the timing generation circuit 1 in the transmission signal generation circuit 2 and converted into a transmission burst signal at a predetermined position, which is then transmitted controlled by the switch control circuit 4. The signal is sent to the transmission line 9 via the switch 5.

On the other hand, the received burst signal from the transmission path is input to the receiving circuit 3 via the receiving switch 6 which is closed only during the receiving burst halse period by the switch control circuit 4, and is time-expanded by the received burst pulse from the timing generating circuit 1. , is output to the received signal output terminal 11.

On the other hand, the coincidence detection circuit 7 is connected to the timing generation circuit 1 and the reception circuit 3, and detects phase coincidence between the received burst pulse from the timing generation circuit 1 and the reception burst signal from the reception circuit 3, and a mismatch is detected. In this case, the synchronization circuit 8 is driven, and the synchronization circuit 8 moves the phase of the timing generation circuit 1 to match the phase of the received burst pulse with the phase of the received burst signal.During this time, the switch control circuit 4 opens the switch 5 and switches the switch. 6 is closed.

With this configuration, during the non-synchronized period when the phases of the received burst pulse and the received burst signal do not match, the transmitting switch 5 is opened and the receiving switch 6 is closed.
At the time of synchronization, the transmitting switch 5 is closed and the receiving switch 6 is closed only during the period of the received burst signal, so that no interference signal due to the transmitted burst signal is added to the transmission line 9 and the receiving circuit 3.

As explained above, the present invention detects whether or not the phases of the received burst pulse and the received burst signal match by the coincidence detection circuit 7, and if they do not match, the timing generation circuit 1 generates the received burst pulse. control so that a matching signal is obtained; at the same time, the transmitting switch 5 is opened and the receiving switch 6 is closed, and if a matching signal is obtained, the transmitting switch 5 is closed and the receiving switch 6 is closed. Since it is closed only during the reception burst signal period, it is possible to prevent interference caused by the transmission burst signal to the transmission line 9 and reception circuit 3 in an asynchronous state, and to realize a stable burst type transmission system. It is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a communication device to which the burst synchronization control method of the present invention is applied. 1... Timing generation circuit, 2... Transmission signal generation circuit, 3... Receiving circuit, 4...
...Switch control circuit, 5...Transmission switch,
6... Reception switch, 7... Coincidence detection circuit, 8... Synchronization circuit, 9... Transmission line,
10... Transmission signal input terminal, 11...
This is a received signal output terminal.

Claims (1)

[Claims] 1. A timing generation circuit that generates a transmission burst pulse and a reception burst pulse, a transmission signal generation circuit that generates a transmission signal during the transmission burst pulse, a transmission switch, a transmission switch that connects the transmission signal generation circuit to a transmission path, and a reception circuit as described above. A reception switch connected to a transmission path, a detection circuit that detects a phase match between the reception circuit output signal and the reception burst pulse, and when there is no output from the detection circuit, the transmission burst pulse and reception burst from the timing generation circuit. a synchronization circuit that moves the phase of the pulse until there is an output from the detection circuit, and when there is no output from the front ship detection circuit, the transmission switch is released, the reception switch is made conductive, and when there is an output from the detection circuit, the transmission switch is activated to transmit. Timing control in a burst type transmission system characterized by comprising: a switch control circuit that makes the receiving switch conductive during the received burst pulses, and opens both switches during the other periods. method.