JPH03101337A - Time division multiple transmission system - Google Patents

Abstract

PURPOSE:To always and normally transmit data by switching the data transmitted from a prestage equipment and the data in a present transmitter, timing- regenerating the output and a frame pulse by means of a clock and outputting them to an equipment in a subsequent stage. CONSTITUTION:A receiver 1 outputs a clock (a) generated in a clock generation circuit 3 and the frame pulse (b) to a transmitter 2a. The transmitter 2a receives the clock (a) and the frame pulse (b) in a transmission timing generation circuit 6, decides the timing transmitting data of its own equipment and transmits it to a switching circuit 7. The switching circuit 7 changes over the data from a previous stage in accordance with the timing with the data of the its own equipment and outputs it to a timing reproduction circuit 8. The timing reproduction circuit 8 timing-reproduces the frame pulse (b) and the output of the switching circuit 7 in accordance with the clock (a), and outputs them to a transmitter 2b in the subsequent stage. Thus, data is always and normally transmitted regardless of the distance between the receiver 1 and the transmitter 2 or the number of the transmitters.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a time division multiplex transmission system, and more particularly to a time division multiplex transmission system in which outputs from a plurality of output devices are time division multiplexed and transmitted to one input device. .

[Conventional technology]

Conventionally, in this type of time division multiplex transmission system, referring to FIG.
The transmission timing generation circuit 16 of each transmission device 12a to 12d receives the clock a and the frame pulse b output by the transmitter 3, and outputs data via the output buffer 9 based on this. Then, the reception circuit 15 receives the clock and frame pulses output from the reception timing generation circuit 14.
The method was to receive data.

[Problem to be solved by the invention]

In the conventional time division multiplex transmission method described above, the transmitter outputs data at the time slot timing assigned to each transmitter according to the clock and frame pulse output by the receiver, and the receiver outputs the data using the output clock and frame pulse. The method was to receive the Therefore, due to the delay due to the distance between the receiving device and the transmitting device and the delay tube inside the transmitting device, data may arrive at the receiving device out of the allocated time slot, as shown in the time chart in Figure 4, and data may collide. The disadvantage is that it occurs.

An object of the present invention is to provide a time division multiplex transmission method that allows data to be transmitted normally regardless of the distance between a receiving device and a transmitting device or the number of transmitting devices.

[Means to solve the problem]

The time division multiplex transmission system of the present invention is a time division multiplex transmission system in which output data from a first transmitter and at least one second transmitter is time division multiplexed and sent to a receiver. A first and a second transmitter are connected in a loop: a clock that determines the transfer rate and a frame pulse that synchronizes the time slot are generated,
a clock generating means for outputting the clock to the transmitting device; a receiving timing generating means for determining the receiving timing based on the clock and frame pulse from the second transmitting device; a receiving device having: receiving means for receiving output data; and a first transmission timing generating means for setting a timing for transmitting data in its own transmitting device based on the clock and frame pulses sent from the receiving device; ,
a first switching means for switching and outputting the output data from the receiving device and the data in the own transmitting device based on the transmission timing; and timing regeneration based on the output data from the first switching device and the frame pulse. and a first timing regenerating means for performing and outputting the timing to the second transmitting device; a second transmission timing generating means for setting a timing for transmitting the data; and a second switching for switching and outputting the output data from the first transmitting device and the data in the own transmitting device based on the transmitting timing. and the second transmitter having a second timing regenerating means for performing timing regeneration based on the output data and frame pulses from the second switching means and outputting the result to the receiving apparatus. has been done.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

The four transmitting devices 2a to 2d are a receiving device 1 and a transmitting device 2.
Referring to FIG. 1, which shows an embodiment of the present invention connected in a loop such as a-transmitting device 2b=transmitting device 2c-transmitting device 2d-receiving device 1, the receiving device 1 is connected to the timing of the entire system. a clock generation circuit 3 that generates a clock a and a frame pulse b that determine the timing of data C and outputs them to the transmitter 2a, and a reception circuit that determines the reception timing of the data C based on the clock a and frame pulse b sent from the transmitter 2d. It includes a timing generation circuit 4 and a reception circuit 5 that receives data C according to the reception timing determined by the reception timing generation circuit 4. The transmitting devices 2a to 2d each have a transmission timing generation circuit 6 that determines the timing for transmitting the data of the device itself based on the clock a and the frame pulse b sent from the previous device, and the transmission timing generation circuit 6. A switching circuit 7 switches and outputs data sent from the previous stage and data of its own device according to a determined timing, and a frame pulse b and the output of the switching circuit 7 are regenerated in timing using a clock a and output to the next stage. and a timing regeneration circuit 8.

The receiving device 1 outputs the clock a and frame pulse b generated by the clock generating circuit 3 to the transmitting device 2a. In the transmitting device 2a, the clock a and the frame pulse b are received by the transmission timing generation circuit 6, the timing for transmitting the data of the device itself is determined, and the timing is transmitted to the switching circuit 7. The switching circuit 7 switches the data from the previous stage according to this timing.
In this case, the data from the receiving device 1 and the data of the own device are switched and outputted to the timing recovery circuit 8. The timing recovery circuit 8 performs timing recovery on the frame pulse b and the output of the switching circuit 7 according to the clock a, and outputs it to the next stage device, in this case, the transmitting device 2b.
The above operations are performed in the same way in the transmitting devices 2b to 2d.The output timing of each of these devices is shown in the timing chart of FIG. 2.In the receiving device 1, the final stage transmitting device 2d
The reception timing generation circuit 4 receives the clock a and the frame pulse b from the reception timing generation circuit 4, and determines the data reception timing. The receiving circuit 5 receives data from the final stage transmitting device 2d according to the receiving timing as shown in FIG.

In this embodiment, the case where there are four transmitting devices is shown, but even in the case of other plurality of transmitting devices, the first and last transmitting devices can be connected to the receiving device and configured in a loop state in the same manner.

〔Effect of the invention〕

As explained above, the present invention connects a receiving device and a plurality of transmitting devices in a loop, and each transmitting device receives the clock and frame pulses sent from the previous device based on the clock and frame pulse sent from the previous device. By switching between the data and the data in the own transmitting device, reproducing the timing of the output and frame pulse using a clock, and then outputting it to the next device, the phase relationship between the clock, frame pulse, and data can be adjusted. It is always maintained normally, and has the effect that data can always be transmitted normally regardless of the distance between the receiving device and the transmission bag W or the number of transmitting devices.

9. Output buffer.

Claims (1)

[Claims] In a time-division multiplex transmission method in which output data from a first transmitting device and at least one second transmitting device is time-division multiplexed and sent to a receiving device, the receiving device, the first
and a second transmitting device connected in a loop; clock generating means for generating a frame pulse for synchronizing a clock that determines a transfer rate and a time slot, and outputting the generated frame pulse to the first transmitting device; a receiving device comprising: a receiving timing generating unit that determines a receiving timing based on a clock and a frame pulse from the second transmitting device; and a receiving device that receives the output data from the second transmitting device based on the receiving timing; a first transmission timing generation means for setting the timing for transmitting data in the own transmitting device based on the clock and frame pulses sent from the transmitting device; a first switching unit that switches and outputs based on the transmission timing; and a first timing that performs timing recovery based on output data and frame pulses from the first switching unit and outputs to the second transmitting device. a second transmission timing generating means for setting a timing for transmitting data within the own transmitting device based on a clock and a frame pulse sent from the first transmitting device; and a second switching means for switching and outputting the output data from the first transmitting device and the data in the own transmitting device based on the transmission timing, and the output data and frame pulse from the second switching means. A time division multiplex transmission system, characterized in that the second transmitting device has a second timing reproducing means for performing timing regeneration based on and outputting the recovered timing to the receiving device.