JP2897444B2 - Line monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line monitor 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 an ISDN (Integrated Services Digital Network) is visually monitored by a line monitoring device, generally, transmitted data is represented by "1" and "0" according to a coding rule. Are displayed on the monitor screen as shown in FIG. 4 continuously as a binary number or in a frame unit for each channel.

[0003]

However, in such a conventional monitor data display system, even if a signal on a digital communication line is a bipolar-coded bipolar pulse train signal, this signal is simply encoded. However, there is a problem that the sign of the bipolar code cannot be discriminated and the presence or absence of code violation cannot be monitored.

The present invention solves such a conventional problem, and provides a line monitor device which can determine the sign of bipolar-coded data on a digital communication line and can easily read code violation. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a received data polarity determining circuit for receiving bipolar encoded data on a digital communication line and for separating positive and negative pulses of the data. A framing processing circuit for extracting frame synchronization or bit synchronization from the data string separated into positive and negative pulses and extracting data to be displayed, a framing processing circuit for extracting the data to be displayed, and A character generation circuit for converting data into characters, an inversion display timing generation circuit for generating an inversion display timing from a 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 character table from the character generation circuit according to the polarity. It is made of a display control circuit for inverting the.

[0006]

Therefore, according to the present invention, the bipolar encoded data on the digital line is separated into positive and negative pulses by the received data polarity judgment circuit, and the data to be displayed by the framing processing circuit is separated from the separated data. The extracted character is converted into a character by adding it to a character generation circuit, and is added to a display control circuit. Then, a timing signal for inversion display is generated from the data separated by the inversion display timing generation circuit, and the timing signal is applied to the display control circuit to invert and display the character corresponding to the inversion display timing. Because of this, it is possible to determine whether the pulse is positive or negative on the actual line, and it is easy to read the code violation.

[0007]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a reception data polarity determination circuit that includes an interface circuit (not shown), performs incoming call processing, and determines positive and negative pulses of reception data (bipolar code) and separates them. A framing processing circuit for extracting frame synchronization or bit synchronization from the determined data string and extracting a data string to be displayed, 13 is a character generation circuit for converting the data to be displayed into characters, and 14 is a received data polarity determination. 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 the inversion display timing signal is output to the display control circuit 15. The display control circuit 15 is for inverting the display of a character from the character generation circuit 13 corresponding to the inverted 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 described with reference to the flowchart shown in FIG. FIG. 2 shows an operation procedure for displaying received data on a monitor screen of a display device. First, in step S1, data on a digital communication line is received by a received data polarity determination circuit 11, and positive and negative pulses are received. (Step S
2). In the next step S3, by adding the separated data to the framing processing circuit 12, the frame of the data is synchronized, and the position of the data to be displayed in the frame is determined. 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). If it is determined that the value is "1", the process jumps to step S8 to output the character data to the display device 16 through the display control circuit 15 and display it. If it is determined to be "0", the process proceeds to step S6 to determine whether the pulse is a positive pulse or a negative pulse. If it is a positive pulse, the process jumps to step S8 to display a character of "0" on the display device 16. If it is determined that the pulse is a negative pulse, the process proceeds to step S7 to generate inverted display timing. The circuit 14 gives an inversion command to the display control circuit 15, inverts the display character data, and displays the inverted character data on the display device 16.

FIG. 3 shows a data display state on a monitor screen in this embodiment. Here, code 3
Since the data of the bits indicated by 1 to 36 are data transmitted by negative pulses, they are displayed in reverse video. Therefore,
In this data string, it can be easily recognized that code violation has occurred at the bit positions indicated by reference numerals 32 and 33.

The present invention is not limited to the configuration shown in the above embodiment, but can be variously modified without departing from the scope described in the claims.

[0011]

As is apparent from the above embodiment, the present invention discriminates the sign of the bipolar-encoded data pulse on the digital communication line, and inverts one of the sign pulses to display a character. This has the effect that the code violation can be easily read.

[Brief description of the drawings]

FIG. 1 is a block diagram of a line monitoring apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation procedure of data display in the embodiment.

FIG. 3 is an explanatory diagram of a monitor screen display in the embodiment.

FIG. 4 is an explanatory diagram of a conventional monitor screen display.

[Description of Signs] 11 Received data polarity determination circuit 12 Framing processing circuit 13 Character generation circuit 14 Inverted display timing generation circuit 15 Display control device 16 Display device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04L 25/00 H04L 29/14

Claims (1)

(57) [Claims] 1. A receiving data polarity determining circuit for receiving bipolar encoded data on a digital communication line and separating and determining positive and negative pulses of the data, and performing frame synchronization or data synchronization from a data sequence separated into positive and negative pulses. A framing processing circuit for extracting bit synchronization and extracting data to be displayed, a character generation circuit for converting the data to be displayed into characters, and generating an inverted display timing from a positive / negative separation signal from the received data polarity determination circuit. And a display control circuit controlled by an inverted display timing signal from the inverted display timing generating circuit to invert the character display from the character generating circuit in accordance with the polarity. Line monitoring device.