JPH0465944A - Radio transmitter-receiver - Google Patents

Abstract

PURPOSE:To input an AIS to a multiplex signal demultiplexer connected to a base band reception output terminal at a loopback test, to eliminate malfunction due to a line test signal and to inform the testing state to the demultiplexer by providing a selection circuit and an AIS generating circuit to the output terminal. CONSTITUTION:When a loopback test is executed, a switch circuit 1 connects a reception section and a transmission section, a selecting circuit 2 interrupts the output of a reception signal processing section 7 to connect the output of an AIS generating circuit 3. Thus, a test signal inputted from an input terminal 4 of the reception section is looped back to a transmission signal processing section 8 by the circuit 1 through a reception high frequency section 5, a demodulation section 6 and the processing section 7 and outputted from an output terminal 11 through a modulation section 9 and a transmission high frequency section 10. Moreover, an alarm signal caused in the circuit 3 passes through the circuit 2 and it outputted to a reception output terminal 12 to inform the testing state to the multiplex signal demultiplexer and to prevent malfunction by the test signal.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wireless transmitting/receiving device that transmits digital signals, and in particular, the present invention relates to a wireless transmitting/receiving device that transmits digital signals, and in particular, transmitting and receiving test signals in the baseband band from a receiving section to a transmitting section. The present invention relates to a wireless transmitting/receiving device having a function of monitoring and measuring.

[Conventional technology]

Conventionally, in this type of wireless transmitter/receiver, as shown in the block diagram of FIG.
It is composed of a reception high frequency section 4, a digital signal demodulation section 6, a reception signal processing section 7 that decodes the digital signal and processes baseband signals, communication control signals, etc., and a baseband output terminal 12. consists of a transmission signal processing section 8 that encodes signals input from the baseband transmission input terminals 1 and 3, a digital signal modulation section 9, a transmission high frequency section 10, and an output terminal 11 for transmitting waves to the opposite station. has been done. Here, the line test signal is connected by the baseband loop switch circuit 1 from the reception signal processing section 7 to the transmission signal processing section 9 with a delay, but the test signal is also output to the baseband output terminal 12.

[Problem to be solved by the invention]

In the conventional wireless transmitter/receiver described above, when the baseband loop switch circuit is operated and the line test signal is looped back from the receiver to the transmitter, the line test signal is also output to the baseband output lamp of the receiver. , is input to a multiplex signal demultiplexing device of a carrier terminal station connected to the outside of this baseband output end.

The multiplex signal demultiplexer sends out an abnormality alarm because the signal is different from the normal signal. Therefore, there is a drawback that an abnormality alarm is sent out even though the multiplex signal demultiplexing device is normal.

[Means to solve the problem]

A wireless transmitting/receiving device of the present invention includes a receiving section and a transmitting section that perform reception and transmission using radio waves with an opposite station and have a baseband reception output terminal and a baseband transmission input terminal, respectively, and a baseband transmission section of the reception section and the transmission section. In a wireless transmitting/receiving device having a baseband loop switch circuit for a line test signal that is folded back at a band, the receiver output and the baseband loop switch circuit are connected between the receiver output and the baseband reception output end during a line test. It has a selection circuit that disconnects the reception output terminal and connects the output of the alarm indication signal generation circuit and the baseband reception output terminal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. In the embodiment shown in FIG. 1, an AIS (Alar+a In
dication Signal) Outlet F! The configuration is the same as the conventional example shown in FIG. 2 except that @3 and selection circuit 2 are connected.

Next, the operation of this embodiment will be explained. When performing a loopback test, the baseband loop switch circuit 1 operates to connect the receiving section and the transmitting section.

In this embodiment, the selection circuit 2 further operates to cut off the output of the received signal processing section 7 and connect the output of the AIS generation circuit 3. Therefore, the test signal inputted from the input terminal 4 of the receiving section is transmitted to the receiving high frequency section 5 as in the conventional example. Demodulator 6.
The signal passes through the received signal processing section 7, is looped back to the transmission signal processing section 8 on the transmission section side by the baseband loop switch circuit 1, passes through the modulation section 9, the transmission high frequency section 1o, and is outputted from the output terminal 11. Further, the alarm signal generated by the AIS generating circuit 3 passes through the selection circuit 2 and is outputted to the baseband reception output terminal 12 to notify the multiplex signal demultiplexing device that the test is in progress.

〔Effect of the invention〕

As explained above, the present invention provides a carrier that is connected to the baseband output end of the reception section during a return test by connecting the selection circuit and the AIS generation circuit between the reception signal processing section and the baseband reception output end. Since the AIS is input to the multiplex signal demultiplexer at the end of the line, it is possible to eliminate malfunctions such as the multiplex signal demultiplexer sending out an abnormality alarm using a line test signal, and also to be able to recognize that the test is in progress.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional wireless transmitter/receiver. 1-...Baseband loop switch circuit, 2...Selection circuit, 3...AIS generation circuit, 4-mountain circuit, 5...
- Reception high frequency section, 6... Demodulation section, 7... Reception signal processing section, 8... Transmission signal processing section, 9... Modulation section, 1o
... Transmission high frequency section, 11... Output end, 12... Baseband reception output end, 13... Baseband transmission input end.

Claims (1)

[Claims] 1. A receiving section and a transmitting section that perform reception and transmission using radio waves with an opposing station and each have a baseband reception output terminal and a baseband transmission input terminal, and baseband components of the reception section and the transmission section. In a wireless transmitting/receiving device having a baseband loop switch circuit for a line test signal that is folded back at a line test signal, a baseband loop switch circuit is provided between the receiving unit output and the baseband receiving output end. A wireless transmitting/receiving device comprising a selection circuit that disconnects the output terminal and connects the output of the alarm indication signal generating circuit and the baseband reception output terminal. 2. The alarm indication signal generation circuit is characterized in that it sends out an alarm signal that makes the multiplexing signal demultiplexing device of the carrier terminal station connected to the outside of the baseband reception output terminal aware that a line test is in progress. The wireless transmitting/receiving device according to claim 1.