JPS63283258A - Remote loop back circuit - Google Patents

Abstract

PURPOSE:To easily perform remote loop back control without multiplexing a dedicated control signal, by using the polarity of a digital transmission signal in the remote loop back control. CONSTITUTION:When the remote loop back control is performed from a station A to a station B, the digital transmission signal is sent by performing the switching operation of the switch 6 of the station A and inverting the polarity of the signal at a polarity inversion circuit 5. At this time, the station B decides the fact of the inversion of the polarity of the digital transmission signal at a polarity decision circuit 17, and performs a loop back operation by controlling a loop back relay circuit 18. The loop back control from the station B to the station A can be performed similarly. Thus, it is possible to easily perform the loop back control without multiplexing the dedicated control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote loopback circuit for performing loopback control in a wireless communication device that transmits digital signals.

[Prior Art] Conventionally, remote loopback control circuits create a dedicated loopback control signal and multiplex this loopback control signal on the frequency or time axis of the main digital signal to be transmitted. There was a configuration that transmitted to 9 phase r stations.

[Problems to be Solved] 2. In conventional remote looseback control circuits, there is a circuit that multiplexes the loopback control signal t) onto the main digital transmission signal, and a circuit that multiplexes the loopback control signal t) on the main digital transmission signal, and A circuit for separating the loopback control signal is required, which results in a large structure and high manufacturing cost. Moreover, there is a drawback that the signal spectrum is expanded due to signal multiplexing.

The present invention was made in view of these problems, and it is possible to easily perform remote loopback control without multiplexing dedicated control signals by using the polarity of a digital transmission signal for remote loopback control. [1] Providing a remote loopback circuit that can be used.

[Problem Solution R/Level] In order to achieve objective 1-11, the remote loopback circuit of the present invention is provided in the transmission system 1- in a wireless communication device that transmits digital signals, and means for arbitrarily inverting the polarity of the signal; an f stage provided in the receiving system for determining the polarity of the digital signal sent from the other station; and looping back the received digital signal based on the result of this determination. This is a configuration that punishes the L stage.

[Example] Hereinafter, an example of Unreleased II will be described with reference to the drawings.

FIG. 1 is a block diagram showing a remote loopback circuit section of a wireless communication device according to the present embodiment, FIG. 2 is a block diagram of a polarity inverting circuit in the same remote loop back circuit, and FIG. 3 is a polarity determination circuit. FIG.

In FIG. 1, reference numeral 1.11 is a transmission logic circuit in each station A and B, which transmits transmission signals input from the input terminals 2 and 12 or looped back to the phase [stations]. 3.1
3 is a reception logic circuit in each station A and B, which processes the received digital transmission and outputs it to the input terminal 4.14.

Further, 5.15 is a polarity inversion circuit, and the transmission logic circuit 1
．． The polarity of the digital transmission signal outputted by 11 is inverted by a command from the switch 6.16. The polarity inverting circuits 5, 15 have a data selector 21, as shown in FIG. An inverted digital transmission signal is input to the terminal 23. The configuration is such that one of the signals input to the data selector 21 is output to the output terminal 24 in response to control signals from the switchers 6 and 16.

In FIG. 1, reference numerals 7 and 17 are polarity determination circuits, which manually input the digital transmission signal sent from the other station, determine the polarity of the input signal, and, based on the determination result, generate a polarity determination signal of the digital transmission signal. Output. At the same time, if the polarity is reversed, the received digital transmission signal is converted into a signal with the normal polarity and output.

That is, as shown in FIG.
The received digital transmission signal is inverted and input. Then, an input signal having a polarity that allows frame synchronization in the frame synchronization circuit 34 is outputted from the data selector 31 based on the control signal of the νJ converter 35. This output signal is transmitted to the output terminal 36 in frame synchronization and output to the receiving logic circuits 3 and 13. The switch 35 detects the frame synchronization state in the frame synchronization circuit 34 and performs switching control, but at the same time outputs the ν" switching control signal as a polarity determination signal to the output terminal T-37.

In FIG. 1, 8.18 is a loopback relay circuit, which is controlled by the polarity determination signal from the polarity determination circuit 7.17, and when the polarity of the received digital transmission signal is inverted, the reception logic circuit 3 Loop back the digital transmission signal from .13.

Next, the operation will be explained.

For example, when performing remote loopback control from station A to station B, the 9J converter 6 of the A station is operated to perform vJ conversion, and the polarity inversion circuit 5 inverts the polarity of the digital transmission signal and sends it out. At this time, in the B station, the polarity determination circuit 17 determines that the polarity of the digital transmission signal is inverted, and the loopback relay circuit 18 is controlled to perform a loopback operation.

The same holds true when performing remote loop control from station B to station A.

Note that the present invention is not limited to the one embodiment described above, and can be applied to various communication devices for transmitting digital signals, and also includes a polarity inversion circuit and a polarity determination circuit that inverts and detects the polarity of a digital transmission signal. Of course, various known circuits can be applied.

In addition, in the second series of embodiments, the loopback operation is performed when the polarity of the digital transmission signal is reversed, but if necessary, it can be configured to perform the loopback operation when the polarity remains unchanged. Good too.

Furthermore, in the case of a wireless communication device in which the digital signals to be transmitted are in two or more columns, the remote loopback circuit of the present invention can be applied independently to each column.

1-1 Effects] As explained in 1-1 above, the remote loopback circuit of the present invention uses the polarity of the digital transmission signal for remote loopback control, thereby allowing easy remote control without multiplexing dedicated control signals. Since loopback control can be performed, it has an advantageous effect in simplifying the structure, downsizing, and lowering costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a remote loopback circuit section of a wireless communication device according to an embodiment of the present invention, FIG. 2 is a block diagram of a polarity reversing circuit in the same mote loop back circuit, and FIG. FIG. 2 is a block diagram of a polarity determination circuit. 1.11: Transmission logic circuit 3.13: Reception logic circuit 5.15: Polarity judgment circuit 6.16: Switcher 7.17: Polarity judgment circuit 21.31: Data selector 34: Frame synchronization circuit 35: J switching Ken

Claims (1)

[Claims] In a wireless communication device that transmits digital signals, there is a means provided on the transmission system for arbitrarily reversing the polarity of the digital signal to be transmitted, and a means provided on the reception system for arbitrarily reversing the polarity of the digital signal sent from the other station. 1. A remote loopback circuit comprising: means for determining; and means for looping back a received digital signal based on the determination result.