JPS5817746A - Control station - Google Patents

Abstract

PURPOSE:To easily estimate the state of lines in use, by obtaining the ratio of time between the line in use consisting of sum of an information frame and response frame and the line in non-use being flowed with a gore head frame, at a line using rate detection section. CONSTITUTION:In a reception control section, a data reception signal, a flag reception signal, a gore head frame GA reception signal are distinguished in byte unit and outputted. The logical sum between a data reception signal 26 and a flag reception signal 27 out of the signals is summed in a counter 21. The logical sum with a GA signal 28 is summed to another counter 20 and an overflow signal is outputted at a favorable multiple of the counter 20 and the content summed in the counter 21 is set to a register 22. Just after the operation, the counters 20 and 21 are cleared for the preparation to the next reception signal. Thus, since a new line using rate enters the register 22 repetitively, the content is displayed on a display 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission control device, and particularly to a control system for a transmission line connected in a loop.

Generally, a data transmission device must perform high-quality transmission, and in order to perform high-quality transmission, the line usage rate must be kept above a certain level. In general, transmission quality includes transmission errors, responsiveness to messages, and the like. Transmission errors are greatly affected by the line usage rate, and the smaller the line usage rate, the better. However, the line usage rate is determined by the system functions and configuration.

Conventionally, this line usage rate has been calculated by calculating from the system configuration, or by connecting a separate device to the line to measure the line usage rate. However, in such conventional methods,
The former method is uncertain, and the latter method has the disadvantage that the line usage rate can only be determined when a measuring device is connected.

An object of the present invention is to provide a control station that can regularly measure line usage and utilization.

In addition to the conventional generation and management of GA (bore head) frames that flow on lines, the present invention attempts to make it possible to regularly measure line usage rates by adding a line usage rate measurement function. .

Examples of the present invention will be described below.

FIG. 1 shows a configuration diagram of a transmission system connected in a loop to which the present invention is applied.

In Figure D, a control station 2 and a plurality of stations 3. are connected by a transmission path 1, and each station 3 is connected to a CPU 4, respectively. (Information from 77CPU4 is station 3
, is transmitted to the other party's station 3 via the transmission line 1. However, since there is only one transmission path, multiple transmissions cannot be performed at the same time, and if another transmission is being performed, the system must wait. Therefore, when transmissions become crowded, this waiting time increases, which affects responsiveness and the like. If the congestion of this transmission line can be read out as a line usage rate, it can be used as an index of responsiveness.

FIG. 2 shows the information string flowing through the transmission path. This information string always passes through the control station 2 because the transmission path is connected in a loop.

Therefore, the sum of information frame 6 and response frame 7 sandwiched between F in Figure 2 at this time is the time when the line is actually used, and when GA frame 5 is flowing, the line is not used. It's time. If this ratio can be displayed in some way, the line usage rate can be determined. A specific example of the configuration is shown in FIG. 3, and a circuit diagram of the embodiment is shown in FIG. 4.

Figure 3 shows the configuration of the control station, where the input 17 from the transmission line is the normal receiving circuit 11° switch 19.
．． The signal is sent out again to the transmission path via the transmission circuit 12. The signal from the reception circuit 1 passes through the reception control section 13 and is sent to the GA management section 1.
5 is connected to the transmission management section, and here the GA manages whether the line is operating normally.If the GA is lost, it will be regenerated and the switch 19 should be turned down temporarily. It sends out GATh by tilting it to the side. The above is characterized in that the conventional control station TEALKA is connected from the reception control section 13 to the line usage rate detection section 16.

FIG. 4 is a circuit diagram specifically configuring the line usage rate detection section 16. The reception control unit 13 in FIG. i3 receives the data reception signal 8 as shown in FIG. The flag reception signal and the GA reception signal are distinguished in byte units and output, and the result obtained by ORing the data reception signal 26 and the flag reception signal 27 is added to the color signal 21. Furthermore, the GA signal 28'
fr: Adds the ORed value to another counter 20, which is just the right multiple of this counter 20 (-
(10,000, child, etc.) outputs an overflow signal, and the contents added to the counter 21 are set in the register 22. Immediately after that, clear counters 2o and 21'ft,
Prepare for the next received signal.

As a result, new line usage rates are repeatedly entered into the register 22. This content can be made visible by connecting the display 23.

Therefore, according to this embodiment, the usage status of the line can be easily grasped, and the responsiveness can be easily estimated.

Further, according to this embodiment, it is possible to obtain appropriate judgment materials for system modification and expansion.

As explained above, according to the present invention, steady line usage rate can be measured.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a transmission system to which the present invention is applied;
3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is a detailed circuit diagram of the line usage rate detection section shown in FIG. 3. 20.21...Counter, 23...Register, 24
゜Figure 3 Figure 4

Claims (1)

[Claims] 1. At a control station that controls transmission between multiple stations installed on a transmission line connected in a loop, calculate the ratio of the sum of information frames and response frames to the time during which GA frames are flowing. A control station characterized by being equipped with a means for obtaining information.