JPH04309041A - Line monitor equipment - Google Patents

Abstract

PURPOSE:To easily discriminate code violation by deciding the polarity of data subjected to bipolar coding on a digital communication line. CONSTITUTION:A reception data polarity deciding circuit 11, a framing processing circuit 12 and a character generating circuit 13 generate a character data to display a line data. Then an inverting display timing generating circuit 14 generates a timing for inversion display to control a display control circuit 15 thereby displaying the display character data inversely.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line monitoring device for monitoring data on a digital communication line.

0002

2. Description of the Related Art Conventionally, when data on a digital communication line such as ISDN (Integrated Service Digital Network) is visually monitored using a line monitor device, the transmitted data is generally coded as "1" and "0" according to a coding rule. '' either continuously or in frame units for each channel on the monitor screen as shown in FIG.

0003

[Problems to be Solved by the Invention] However, in such conventional monitor data display systems, even if the signal on the digital communication line is a bipolar encoded bipolar pulse train signal, it is simply encoded by the encoding rule. Since the method only performs a binary judgment and displays the result, there is a problem in that it is not possible to determine whether the bipolar code is positive or negative, and it is also not possible to monitor the presence or absence of a code violation.

The present invention solves these conventional problems, and provides a line monitor device that can determine whether bipolar-encoded data on a digital communication line is positive or negative and can easily read code violations. The purpose is to

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a received data polarity determination circuit that receives bipolar encoded data on a digital communication line and separates and determines positive and negative pulses of the data. a framing processing circuit that extracts frame synchronization or bit synchronization from a data string separated into positive and negative pulses and extracts data to be displayed; a framing processing circuit that extracts the data to be displayed; Controlled by a character generation circuit that converts data into characters, an inversion display timing generation circuit that generates an inversion display timing from the positive/negative separation signal from the received data polarity determination circuit, and an inversion display timing signal from the inversion display timing generation circuit. and a display control circuit for inverting the character display from the character generation circuit in accordance with the polarity of the character generation circuit.

[0006]

[Operation] Therefore, according to the present invention, bipolar encoded data on a digital line is separated into positive and negative pulses by the received data polarity determining circuit, and data to be displayed is determined from the separated data by the framing processing circuit. It is extracted and added to a character generation circuit, converted into a character, and then added to a display control circuit. Then, a timing signal for reverse display is generated from the separated data by a reverse display timing generation circuit, and by applying this timing signal to a display control circuit, the character corresponding to the reverse display timing is displayed in reverse. Because of this, it is possible to determine whether the pulse is positive or negative on the actual line, and code violations can be easily read.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 11 includes an interface circuit (not shown), and a reception data polarity determination circuit that performs incoming call processing and determines and separates positive and negative pulses of reception data (bipolar code), and 12 is a reception data polarity determination circuit 11 that determines the polarity. A framing processing circuit extracts frame synchronization or bit synchronization from the determined data string and also extracts a data string to be displayed; 13 is a character generation circuit that converts this data to be displayed into a character; 14 is a reception data polarity determination circuit This is an inversion timing generation circuit that generates a timing signal for inversion display from the positive and negative signals determined and separated by the circuit 11, and this inversion display timing signal is output to the display control circuit 15. The display control circuit 15 controls the inversion of the display of characters from the character generation circuit 13 corresponding to the inversion display timing signal, and a display device 16 is connected to the display control circuit 15.

Next, the operation of the above embodiment will be explained with reference to the flowchart shown in FIG. FIG. 2 shows the operation procedure for displaying received data on the monitor screen of a display device. First, in step S1, data on the digital communication line is received by the received data polarity determination circuit 11, and positive and negative pulses are detected. The judgment is separated for each step (step S2
). In the next step S3, the determined and separated data is applied to the framing processing circuit 12 to achieve frame synchronization of the data and determine the position of the data to be displayed within the frame. Then, in the next step S4, display character data corresponding to the data to be displayed is generated from the character generation circuit 13, and it is determined in step S5 whether the channel data is "1" or "0" (step S5). Here, when it is determined that it is "1", the process jumps to step S8, and the character data is directly output to the display device 16 through the display control circuit 15 and displayed. Further, when it is determined that the pulse is "0", the process proceeds to step S6, and it is determined whether the pulse is a positive pulse or a negative pulse. If it is a positive pulse, the process jumps to step S8 and a character "0" is displayed on the display device 16, and if it is determined to be a negative pulse, the process moves to step S7 to generate a reverse display timing. An inversion command is given from the circuit 14 to the display control circuit 15 to invert the displayed character data, and this inverted character data is displayed on the display device 16.

FIG. 3 shows how data is displayed on the monitor screen in this embodiment. Here, code 3
Since the data of the bits indicated by 1 to 36 are data transmitted with negative pulses, they are displayed in reverse. therefore,
In this data string, it can be easily determined that a code violation occurs at the bit positions indicated by numerals 32 and 33.

It should be noted that the present invention is not limited to the configuration shown in the above embodiments, but can be modified in various ways without departing from the scope set forth in the claims.

[0011]

[Effects of the Invention] As is clear from the above embodiments, the present invention determines whether the bipolar encoded data pulse on the digital communication line is positive or negative, and inverts one of the positive and negative pulses to display a character. This has the effect that code violations can be easily read.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a line monitor device showing an embodiment of the present invention.

[Fig. 2] Flowchart showing the operation procedure of data display in this embodiment

[Figure 3] Explanatory diagram of monitor screen display in this embodiment

[Figure 4] Explanatory diagram of conventional monitor screen display

[Explanation of symbols]

11 Received data polarity determination circuit 12 Framing processing circuit 13 Character generation circuit 14 Reverse display timing generation circuit 15 Display control device 16 Display device

Claims (1)

[Claims] Claim 1: A received data polarity determination circuit that receives bipolar encoded data on a digital communication line and separates and determines positive and negative pulses of the data, and a frame synchronization or A framing processing circuit that extracts bit synchronization and data to be displayed, a character generation circuit that converts the data to be displayed into characters, and generates inverted display timing from the positive/negative separation signal from the received data polarity determination circuit. and a display control circuit that is controlled by an inversion display timing signal from the inversion display timing generation circuit and inverts the character display from the character generation circuit in accordance with the polarity. Line monitoring device.