JPH03293830A - Time division multiplexing transmission system - Google Patents

Abstract

PURPOSE:To improve the utilization efficiency of slots by constituting the data in one slot with communication data and connection terminal identifying data. CONSTITUTION:At the time of data transmission from a terminal equipment, communication data inputted from a communication port 12 is converted to parallel data by a serial-parallel/parallel-serial conversion part 11 and is stored in a data buffer 9 together with terminal identifying data 1a generated by a terminal identifying data generating circuit 10. A terminal communication data input/output timing control part 8 controls a terminal data input/output signal 3 corresponding to the terminal equipment, for which the data should be next transmitted, based on terminal identifying data 1a and stuffs a transmission slot 1 with a portion of one slot of communication data stored in data buffers 9 (1 to (n)) through a data bus 4. Thus, a transmission frame 2 is effectively used and the number of connected terminals can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multiplex transmission system in data communication.

[Conventional technology]

In the conventional technology, a pair of terminal devices are physically and logically connected to slots forming a transmission frame, and one terminal device exclusively uses one slot to perform data transmission.

[Intelligence problem to be solved by the invention] Therefore, only n pairs of devices can transmit data using n slots, and the rotation speed of the transmission frame is more than a certain level compared to the transmission speed of the terminal device that transmits data. When the size becomes large, data transmission becomes possible by inserting data into the slot once every few times. This means that the slots are used effectively only once every few times, which means that the slots are not used efficiently.

An object of the present invention is to eliminate the drawbacks of the prior art described above, to allow n or more pairs of terminal devices to freely select a slot without a pair of terminal devices monopolizing one slot, and to improve slot usage efficiency. It is an object of the present invention to provide a time division multiplex transmission system capable of connecting n or more pairs of terminal devices using n slots.

[Means and effects for solving the problem] The gist of the present invention is that by making the data structure of one slot into communication data and connection terminal identification data, one slot can be used without being monopolized by one terminal device. , sharing according to the communication speed (one slot is shared by n pairs of terminal devices).

That is, the above-mentioned object of the present invention is to transmit data by adding data for identifying a connected terminal device in a time slot constituting a transmission frame in a time division multiplex transmission system. Characteristic time division multiplex transmission method.

achieved by.

As a limiting condition of the present invention, it is desirable that the frame transmission speed is several times or more as compared to the communication speed of the terminal device.

〔Example〕

The present invention is comprised of a transmission frame 2 that circulates around a transmission path, a data bus 4 that exchanges data with slots forming the transmission frame 2, a system bus 5, an interface section 13 of a terminal device, and the like.

When transmitting data from a terminal device, the communication data input from the communication board 12 is sent to the serial/parallel converter 1.
1, the data is converted into parallel data and stored in the data buffer 9 together with the data from the data generation circuit 10 for terminal identification. This is the same for the communication boats 12(1) to 12 (→ and the respective data buffers 9(1) to 9(n), that is, n terminals (data), but the data generation circuit 10 for terminal identification It is assumed that each of the generated identification data has a common part indicating the interface within the interface 13, and that the identification data of the paired terminal device is also the same.

Next, as the transmission frame circulates, communication data is sequentially packed into the corresponding transmission slot, and the data input/output timing control circuit 7 receives the arrival timing of the corresponding transmission slot from the system bus 5, Instructs the terminal communication data input/output timing control unit 8 that this applies.

The terminal communication data input/output timing control section 8 controls the terminal data input/output signal 3 corresponding to the terminal device to be transmitted next based on the 13 pieces of terminal identification identification data, and controls the terminal data input/output signal 3 corresponding to the terminal device to be transmitted next. The communication data stored in 1 to n) is packed into the transmission slot via the data bus (in other words, the order is to receive data from the transmission slot and send data to the transmission slot).Receiving is the complete opposite flow. becomes.

Another method is to receive terminal identification data from the system bus 5 instead of the terminal identification data generation circuit 10 and automatically generate it.

〔Effect of the invention〕

By using the time division multiplex transmission method of the present invention, even if the number of slots in a transmission frame is n, by adopting this method, the number of slots appears to be n or more. That is, even if the circulation speed (transmission speed) of the transmission frame is the same as in the past, the number of terminals connected can be increased by effectively using the transmission frame.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the time division multiplex transmission system of the present invention. 1...Transmission slot la...Terminal identification data 1b...Terminal device communication data, transmission frame, terminal data input/output control signal, data bus, system bus, local data bus, data input/output timing control circuit, terminal communication data Input/output timing control circuit 1 slot data buffer, terminal identification data generation circuit, serial/parallel conversion circuit, communication port, terminal interface range 9 ・ ・ l O ・ 11 ・ l 2 ・ 13 ・

Claims (1)

[Claims] A time division multiplex transmission system characterized in that data for identifying a connected terminal device is added to the transmission data and transmitted within a time slot that constitutes a transmission frame. .