JPS62183246A - Two-way recovery repeater - Google Patents

Abstract

PURPOSE:To locate a relay line faulty section by providing a code generating circuit and a timing lock discrimination circuit and sending a prescribed code data signal of the code generating circuit unidirectionally so as to send a fixed pattern at the interruption of an input signal. CONSTITUTION:When an input signal A is interrupted, a since no timing clock is extracted at a timing extraction circuit 5, a clock discrimination circuit 11 detects it to start the code generating circuit 12 and to apply switching control to a switch 4. Since other input signal B exists, a clock from a timing extraction circuit 10 exists and the code generating circuit 12 uses the said clock to generate a code data registered and predetermined synchronously with the said clock. The code data is sent to the 2-way repeater of the next stage via the switch 4. Thus, the code data is discriminated at the post-stage to locate a faulty section of the relay line.

Description

TECHNICAL FIELD The present invention relates to a bidirectional regenerative repeater, and more particularly to a bidirectional regenerative repeater used in a transmission communication system.

A conventional bidirectional regenerative relay system has a configuration as shown in FIG. The bidirectional regenerative repeaters 21 to 23 are connected in tandem to increase the transmission distance. A block in one direction of such a regenerative repeater is shown in FIG. 3, and the transmitted data signal is subjected to waveform correction and amplification in a section adjustment circuit 31 and a preamplification circuit 32, respectively. Then, the timing extraction circuit 34 extracts a timing clock for signal reproduction, and the identification circuit 33 reproduces data using this extracted clock. This reproduced data is subjected to inter-page IDJ using a clock signal and is transmitted to the next stage as a reproduction relay output.

In such a two-way regenerative repeater, if the input signal is suddenly lost, the signal cannot be sent to the next stage two-way regenerative repeater (4), and the opposing station This has the disadvantage that it is impossible to determine whether a fault has occurred between the relay lines.

Purpose of the Invention The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to transmit a fixed pattern when an input signal is cut off, thereby making it possible to identify a faulty section of a trunk line. An object of the present invention is to provide a bidirectional regenerative relay device.

According to the present invention, there is provided a bidirectional reproducing device having a timing extraction circuit capable of extracting a timing clock for reproduction from a transmitted data signal, the timing clock being predetermined in response to the timing clock. a code generation circuit that generates a data signal with a predetermined code, and a code generation circuit that detects a disconnection of the timing clock caused by disconnection of the input data signal in one direction and generates a timing clock extracted from the input data signal in the other direction. a timing clock determination circuit that operates the code generation circuit based on the timing clock determination circuit, and transmits a predetermined code data signal of the code generation circuit in the one direction.
My neck gets 111.

Example Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which a section adjustment circuit 1. Preamplifier circuit 2. The identification circuit 3° cutoff BZ4 and the timing extraction circuit 5 have a regenerative relay function for unidirectional data transmission. Section adjustment circuit 6. Preamplifier circuit 7
．． Identification circuit 8. The switch 9 and the timing extraction circuit 10 have a regenerative relay function for data transmission in the other direction.

The clock extraction states of the timing extraction circuits 5 and 10 are constantly monitored by a clock determination circuit 11, and when one of the clocks is cut off, the code generation circuit 12 is activated.

This code generation circuit 12 generates predetermined code data in response to the other clock. This code data is input to each of the switching devices 4 and 9.

In this configuration, when one input signal A is disconnected, the timing extraction circuit 5 does not extract the timing clock, so the clock discrimination circuit 11 detects this and activates the code generation circuit 12, and also performs switching. Switching control is performed on the device 4. Since the other input signal B is present, the clock from the timing extraction circuit 10 is present, and the code generation circuit 12 is registered with this clock and generates predetermined code data in synchronization with the clock. This code data is sent via the switch 4 to the next stage bidirectional repeater (not shown). Therefore, by determining this code data at a subsequent stage, it becomes possible to identify the faulty section of the relay line.

Note that if the other input signal B is disconnected, the switch 9
It is clear that when IJl is created, the encoded data is sent to the subsequent stage instead of this input signal B.

Effects of the Invention As described above, according to the present invention, when the input signal is cut off,
Is the pre-registered unique pattern right? By transmitting the q data using a clock signal regenerated by an input signal in the other direction, there is an effect that the opposite station can easily detect a faulty section of the trunk line.

In addition, by setting all the fixed patterns to 1'',
It can also be an alarm signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a system diagram of a bidirectional regenerative repeater to which the present invention is applied, and FIG.
The figure is a block diagram showing the prior art. Explanation of codes of main parts 4.9... Switcher 5.10... Timing extraction circuit 11... Clock judgment circuit 12... Code generation circuit

Claims (1)

[Claims] A bidirectional regenerative repeater having a timing extraction circuit for extracting a timing clock for reproduction from a transmitted data signal, the code generating a data signal of a predetermined predetermined code in response to the timing clock. A generation circuit detects a disconnection of the timing clock caused by disconnection of the input data signal in one direction and operates the code generation circuit based on the timing clock extracted from the input data signal in the other direction. 2. A bidirectional regenerative repeater, comprising: a timing clock determination circuit, and configured to transmit a predetermined code data signal from the code generation circuit in the one direction.