JPH01162033A - Device for generating data delay - Google Patents

Abstract

PURPOSE:To easily prepare a condition, which is close to the various types of real environments, and to exactly and economically execute the test and evaluation of an on-line communicating equipment by inputting transmission or reception data to a shift register with being sychronized to the clock signal of on-line data, giving delay and selectively executing an output. CONSTITUTION:Reception data 31 are a binary digital signal to be output from a data termination equipment 2 with being corresponded to a reception clock signal 32 and successive-shift-inputted to a shift register 34 with the timing of the reception clock signal 32. This successive shift-input means to add the delay and according to the selection of a variable manual switch 35, the shift register 34 outputs modifying reception data 33, to which the delay is given. For a data terminal equipment 1, the data 33 look line the delayed receiving data just as the normal receiving data. The shift register 34 adopts the constitution of 1bit/minimum 64kilo-bit/maximum and a switch 35 is selected according to expected delaying quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data delay generation device that delays online data in a digital online communication line.

[Conventional technology]

Traditionally, testing and evaluation of delays caused by external factors in online data have been handled by using the actual line where the delay occurs, or by creating a delay environment by modifying the software in the online communication equipment. It is common to do so.

[Problem that the invention seeks to solve]

However, when an actual line is used, the test must be performed using an expensive communication line, and the amount of delay may change depending on the usage status of the actual line, which reduces the accuracy of the test.

Further, even if a delay environment is created by pseudo-changing the software in an online communication device, the accuracy of the test is lost because this communication device serves both as a test device and a device under test.

[Means for solving the problem] - The data delay generating device of the present invention includes a shift register that delays the online data in synchronization with a clock signal of the online data for a digital online communication line, and a shift register that delays the online data by the shift register. and a switch for selectively outputting the online data according to the amount of delay.

〔Example〕

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

Referring to the figure illustrating one embodiment, the data terminal device l corresponds to an online communication device. The data termination device 2 is an interface with the online communication line 4. The data terminal device 1 is connected to the communication line 4 by a digital interface, and the interface formats such as Vll, V24, V28, and V35 shown in the general column (!: I, ccITT recommendation) correspond to the data terminal device 1. A data delay generating device 3 is provided between the data terminal device 2 and the data terminating device 2 .

Here, a description will be given of how the received data 31 input to the data delay generating device 3 is delayed as the modified received data 33. The received data 31 is a binary digital signal outputted from the data termination device 2 in correspondence with the received clock signal 32, and is sequentially shifted into the shift register 34 at the timing of the received clock signal 32.

This sequential shift means that a delay is added, and the shift register 34 is controlled by a variable manual switch 35.
Modified received data 33 that is delayed according to the selection of ? Output. The data terminal device 1 sees the data 33 as received data with a delay, just like normal received data. The shift register 34 has a configuration of 1 bit/minimum to 64 kilobits/maximum, and the switch 35 is selected depending on the expected delay value. For example, the switch 35 is selected so as to pull out a value of 9600 when applying a delay of 1 second at a speed of 9600 bps, and a value of 4800 when applying a delay of 0.5 seconds.

In the above embodiment, a case has been described in which the received data 31 is imported from the data terminal device 2 to the data terminal device 1.
Conversely, the same method can be used to capture transmission data.

〔Effect of the invention〕

As explained above, according to the present invention, transmit or receive data is synchronized with the clock signal pressure of online data, inputted to a shift register, delayed, and selectively output, thereby easily reproducing data similar to various actual environments. states can be created so that testing and evaluation of online communication equipment can be performed accurately and economically.

[Brief explanation of the drawing]

This is a configuration diagram showing an embodiment of the present invention. l... Data terminal device, 2... Data termination device, 3... Data delay generating device, 4...
...online communication equipment, 31...received data, 32...received ift check signal, 33.
...Disturbance reception data, 34...Shift register, 35...Variable manual switch. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] It is characterized by comprising a shift register that delays the online data in synchronization with a clock signal of the online data for a digital online communication line, and a switch that selectively outputs the online data delayed by the shift register according to the amount of delay. data delay generator.