JPH03106139A - Discrimination device for quality of transmission line - Google Patents

Abstract

PURPOSE:To reduce the circuit scale and the power consumption by using one transmission line quality discrimination series in time division corresponding to each input signal series. CONSTITUTION:A signal selection circuit (a) selects an input interface signal 2 among inputted interface signals 11...1n with a series selection signal 8 generated from a control signal generating circuit (g). From the selected input interface signal 2, the quality is discriminated by an interface signal - NRZ signal conversion circuit (b), an error pulse detection circuit (c) and a quality discrimination circuit (d) to obtain quality discrimination resulting information 5. Then the input interface signals are being selected sequentially under the control of the series selection signal 8 to obtain the quality discrimination resulting information 5 corresponding to each series. After the quality discrimination resulting information 5 is stored sequentially in a discrimination result storage circuit (e), an overall discrimination circuit (f) outputs transmission line quality deterioration information 7 as the overall discrimination of the transmission quality of the n-series of the transmission lines for each period of the series selection signal 8. Thus, the scale of the circuit is reduced and the power consumption is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission path quality determination device that determines the transmission quality of n-sequence transmission paths for transmitting digital signals. [Prior Art] Such a conventional transmission quality determination device detects quality deterioration of the transmission path by individually determining the quality of each of the n series of transmission paths, and then performing a two-OR operation on the determination results of the n series. are doing.

The conventional example will be further explained with reference to FIG. A test digital signal is input to each sending end of the n-series transmission line whose transmission quality is to be judged, and the n-series input interface signals 11...1n obtained at the receiving end are converted into NRZ signal from each interface signal. input to circuit b,
Converted to NRZ signals 31...3n. NRZ signal 3
1...3n are input to each error pulse detection circuit C, and error pulses 41...4n in each NRZ signal train are detected. The error pulses 41...4n are input to each quality determination circuit d, and quality deterioration is determined by counting the error pulses 41...4n. The determined quality determination information 51 . . . 5n of each column is input to an OR circuit h, which outputs transmission path quality deterioration information 7.

[Problem to be solved by the invention]

The conventional transmission line quality determination device described above requires an interface signal to NRZ signal conversion circuit, an error pulse detection circuit, and a quality determination circuit for each column of n series transmission lines in order to determine transmission quality. ．． Therefore, as the number n of transmission line series increases, the required number of each of the circuits increases by the same amount, resulting in a disadvantage that the circuit scale increases and the power consumption also increases.

[Means for Solving the Problems] The transmission line quality determination device of the present invention inputs a test digital signal to each sending end of n series (n is an integer of 2 or more) of transmission lines whose transmission quality is to be determined. a signal selection circuit that sequentially selects and outputs the n series of interface signals obtained at the receiving end one series at a time in a time-division manner; and an error detection circuit that detects error pulses in the interface signals of each series input from the signal selection circuit. a pulse detection circuit; a quality determination circuit that determines the signal quality of the interface signal based on the error pulse; and a determination result accumulation circuit that accumulates the determination result of the quality determination circuit every selection switching period of the signal selection circuit. and a comprehensive determination circuit that determines the quality of the n series of interface signals from the information accumulated in the determination result accumulation circuit;
A control signal generation circuit is provided for controlling the signal selection circuit, the determination result accumulation circuit, and the comprehensive determination circuit.

The transmission line quality determination device of the present invention may include a conversion circuit that converts the interface signal input from the signal selection circuit into an NRZ signal and outputs the signal to the error pulse detection circuit. [Example] Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. Input interface signals 11...1n of n series obtained at the receiving end by inputting a test digital signal to each sending end of the transmission line of n series whose transmission quality is to be judged are signal selection circuit a.
is input into . In the signal selection circuit a, one input interface signal 2 among the input interface signals l1...1n is selected by the column selection signal 8 generated by the control signal generation circuit g. The quality of the selected input interface signal 2 is determined by the same interface signal-NRZ signal conversion circuit b, error pulse detection circuit C, and quality determination circuit d as in the conventional example shown in FIG. 2, and quality determination result information is obtained. Get 5. Similarly, input interface signals are sequentially selected under the control of the column selection signal 8, and quality determination result information 5 corresponding to each sequence is obtained. The quality judgment result information 5 corresponding to each series is sequentially accumulated in the judgment result storage circuit e under the control of the column selection signal 8, and then is sent to the comprehensive judgment circuit f for each period of the column selection signal 8. ,
Transmission path quality deterioration information 7 is output as a comprehensive judgment of the transmission quality of the n-series transmission paths.

In addition, the input interface signal 11 output from each transmission line
...If 1n is an NRZ signal, the interface signal-NRZ signal conversion circuit b is not necessary. [Effects of the Invention] As explained above, the present invention uses one transmission line quality judgment series in a time-sharing manner corresponding to each input signal train, thereby achieving an economical design with a small circuit scale and low power consumption. This has the effect of making it possible to have a unique device configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. a...Signal selection circuit, b...Interface signal-
NRZ signal conversion circuit, C...Error pulse detection circuit, d
...Quality judgment circuit, e...Judgment result storage circuit, f.
... Comprehensive judgment circuit, g... Control signal generation circuit.

Claims (2)

[Claims] (1) A test digital signal is input to each sending end of the n series (n is an integer of 2 or more) of transmission lines whose transmission quality is to be judged, and the n series of interface signals obtained at the receiving end are sequentially analyzed one series at a time. a signal selection circuit that selectively outputs signals in a time-division manner; an error pulse detection circuit that detects error pulses in each series of the interface signals inputted from the signal selection circuit; a quality determination circuit that determines signal quality; a determination result accumulation circuit that accumulates the determination results of this quality determination circuit every selection switching cycle of the signal selection circuit; and an interface of the n series based on the accumulated information of this determination result accumulation circuit. A transmission line quality determination device comprising: a comprehensive determination circuit that determines the quality of a signal; and a control signal generation circuit that controls the signal selection circuit, the determination result accumulation circuit, and the comprehensive determination circuit. (2) The transmission line quality determination device according to claim 1, further comprising a conversion circuit that converts the interface signal inputted from the signal selection circuit into an NRZ signal and outputs the signal to the error pulse detection circuit.