JPH0330552A - Data transmitting system - Google Patents

Abstract

PURPOSE:To widely improve transmission capacity by setting bit transmitting velocity together with the velocity of a transmitter equipped with high transmission ability when there is difference in the bit transmission ability between ascending and descending transmitters. CONSTITUTION:When the ability of the descending transmitter is 9600bps and the ability of the ascending transmitter is 1200bps lower than that of the descending transmitter, the ascending and descending transmitters are samely set to the 9600bps as the higher velocity of the descending transmitter and from transmission side transmitter, ascending data velocity is set to 9600bps. However, each time the data of 1 byte are finished to be transmitted, non-transmission time MT is provided as time 7.29ms required for the transmission of 7 bytes. Then, the data are transmitted. Thus, the transmission capacity is widely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data transmission method that enables an increase in the amount of data transmitted.

(Prior art) Conventionally, when transmitting data in both directions up and down via a wired transmission line, if there is a difference in the bit transmission capacity of the data transmission equipment at both ends of the transmission line, the speed that is possible with the transmission equipment with lower capacity may be lower than that in both directions. The bit transmission rate is set to , and the byte transmission rate is the same for transmission.

FIG. 2 shows a conventional transmission byte string in the case where the bit transmission amount is 1200 bps, and (D) and (U) are the cases of downlink and uplink transmission, respectively. In this figure, one start bit and one stop bit are added to each byte, so 10 bits are calculated as one byte. Further, up and down are referred to according to the direction of data transmission as seen from the transmission device, with the direction in which the transmission device sends out going down, and the direction in which it receives data going up, and of course the opposite is true from the perspective of the other party's transmission device.

As shown in Figure 2, conventionally, data transmission is performed by setting the number of uplink and downlink transmission bits to be equal according to the bit transmission speed that is possible on the transmission equipment side with low transmission capacity, so for example, 1200 bps transmission Then, the transmission time for both up and down is 120 bytes, and the time required to transmit 1 byte is 8.3.
It is 3m5.

(Problem to be Solved by the Invention) Conventionally, as described above, in upstream and downstream data transmission, the transmission speed is set to be the same in both directions, so the byte transmission speed must be set to be the same for transmission. Therefore, if the bit transmission capacity of the transmission device is high for the downstream device and low for the upstream device, for example, the transmission will be matched to the transmission speed of the upstream device with the lower capability, and the byte transmission will also be transmitted by the upstream device with the lower capability. Transmitted by speed. Therefore, for example, if the downstream bit transmission capacity is several times larger than the upstream bit transmission capacity, the overall data transmission capacity for upstream and downstream will be reduced.
In other words, a long transmission time is required and the transmission efficiency is extremely poor.

In view of the above, the present invention sets the upstream and downstream transmission bit rates to match the transmission bit values of the transmission device with high transmission capacity, and transmits data from the device with high bit transmission capacity at high speed.
The object of the present invention is to provide a data transmission method that increases the amount of data transmitted by transmitting data at a low speed from a device with a low bit transmission capacity.

(Means for Solving the Problems) The present invention achieves the above-mentioned object by increasing the uplink and downlink bit transmission speeds by enabling the data transmission devices at both ends of the transmission path to achieve a speed of 8+! Set the same value as high as possible, and if the bit transmission capacity of the upstream data transmission device is low, lower the byte transmission rate to perform lower speed upstream transmission, and also reduce the downlink data transmission 'J.
When the bit transmission capacity of the AW is high, this is achieved by performing high-speed downlink transmission using a large byte transmission rate.

(Function) Therefore, according to the present invention, when there is a difference in the bit transmission capability of upstream and downstream transmission devices, the bit transmission speed is set to the speed of the transmission device with higher transmission capability, and the bit transmission rate is set to the speed of the transmission device with lower transmission capability. Transmission devices can transmit data at low speeds, and high-capacity transmission devices can transmit data at high speeds, making it possible to greatly increase transmission capacity.

(Example) Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a model diagram showing a byte string of transmission data to explain an embodiment of the present invention.
0bps, and the capacity of the upstream transmission equipment is less than 20
It is assumed that the speed is 0bps, and (D) is the downlink, and (U)
indicates a byte string of uplink transmission data. Since uplink and downlink transmission devices can preferentially perform their own transmission processing, both uplink and downlink speeds are set to the same high speed of 9600 bps. Therefore, the transmission amount is 960 bytes per second, and the time required to transmit one byte is 1.04 m5.

By the way, as mentioned above, transmission processing can be performed preferentially on the sending side device, but it is not possible on the receiving side.
Therefore, although the uplink data rate is set at 9,600 bps from the transmission device on the sending side, each time one byte of data transmission is completed, as shown in the figure, there is a non-transmission period of 7.29 m required to transmit seven bytes. M, and send it.
do.

Therefore, the actual data transmission amount per second is only 120 bytes, and the actual transmission time U of 1 byte of data is 8.
It will be 33m.

Comparing this with the conventional Figure 2 shown above, the time from the completion of sending one byte to the sending of the next one byte for uplink transmission is the same, 8.33 m5, but for downlink transmission, the time from the completion of sending one byte to the sending of the next one byte is the same. (The time from completion of fl to completion of the next 1-byte transmission is 1.04 m5 in the present invention shown in Fig. 1, whereas it is 8.33 m5 in the conventional case shown in Fig. 2, clearly shown in Fig. 1). It can be seen that the method of the present invention has a transmission rate that is eight times faster.

For example, if the amount of data to be sent is 100 bytes on the downlink and 10 bytes on the upstream, the time required for the entire transmission is 104m5. 8 for upstream transmission
It takes 3m, making the total 187-. In contrast, in the conventional transmission shown in Figure 2, 833I is used for downlink transmission and 833I is used for uplink transmission.
3 times, resulting in a total of 916 listens, and the present invention can reduce the data transmission time by 729 as.

In other words, since the reduced time can be used for transmitting other data, it is clear that the present invention dramatically improves the transmission capacity.

(Effects of the Invention) As is clear from the above explanation, when the data transmission devices at both ends of the transmission path have different bit transmission capabilities, the upstream and downstream bit transmission speeds can be adjusted to By matching the bit transmission speed of the device and compensating the byte transmission assuming that all bytes were transmitted by a transmission device with low bit transmission capacity, the same high bit transmission speed can be achieved by aligning the upstream and downstream transmission speeds to the high capacity. It is possible to transmit data by using this method, and the ability of a high-capacity transmission device can always be fully utilized, which has the effect of greatly improving transmission.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a transmission byte sequence according to an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional transmission byte sequence. M, . . . No transmission time, U, . . . Actual transmission time of 1 byte of data.

Claims (1)

[Claims] The uplink and downlink bit transmission speeds are set to the same high value that can be achieved by the data transmission devices at both ends of the transmission path, and if the bit transmission capacity of the upstream data transmission device is low, the byte transmission speed is reduced to lower the speed. 1. A data transmission method characterized by performing upstream transmission of data, and performing high-speed downstream transmission at a high byte transmission rate when the bit transmission capacity of a downstream data transmission device is high.