JPH03247022A - Monitor system of standby channel for hot standby radio equipment - Google Patents

Abstract

PURPOSE:To monitor deterioration in the transmission characteristic by monitoring the transmission characteristic of an output of a standby equipment while an output of the transmission standby equipment is used for an input to the current and standby receiver equipments. CONSTITUTION:A coupling means 1 couples an output of a transmission standby equipment 20T separated by a sender side high frequency switch RF SW 30 to an input of both receiver side current receiver equipment 10R and standby receiver equipment 20R. Then a changeover means 2 replaces an output of one of receiver side both equipments 10R, 20R, e.g. a local oscillator RLOC of a standby receiver equipment 20R into an output of a transmission use local oscillator TLOC of the standby transmission equipment 20T. Then a radio frequency signal coupled with the input of the receiver side both equipments 10R, 20R being an output of the sender side standby equipment 20T is frequency-converted into an intermediate frequency signal and demodulated to obtain a base band signal. Thus, a fault of the output of the sender side standby equipment 20T separated by the sender side high frequency switch RF SW 30 and a fault of deterioration in the transmission characteristic of the radio transmission section TX are detected and monitored.

Description

[Detailed Description of the Invention] [Summary] The transmitting standby device and the receiving standby device, which are normally separated by a high-frequency switch on the transmitting side and a low-frequency switch on the receiving side, are connected to the active transmitting device and the active receiving device. Regarding the method for monitoring the backup channels of hot standby wireless equipment that can be replaced immediately in the event of a failure, we have investigated the transmission performance of not only the active transmitter of the hot standby wireless equipment, but also the output of the backup transmitter that has been disconnected by a high-frequency switch on the transmitting side. A means for coupling the output of a transmitting backup device separated by a high frequency switch RF S- on the transmitting side to inputs of both a receiving active device and a backup device, and a means for coupling the output of the transmitting backup device separated by a high frequency switch RF S- on the transmitting side to the inputs of both the receiving active device and the backup device. means for replacing the output of a local oscillator for reception of one of the two devices with the output of the local oscillator for transmission of the backup device for transmission, and receives the output of the backup device for transmission separated by the high frequency switch on the transmission side. The output of the transmitting backup device is input to both the active and backup devices, and the intermediate frequency reception output is frequency-converted by the output of the transmitting local oscillator of the transmitting backup device, which is replaced by the output of the receiving local oscillator. Configure to monitor output transmission characteristics.

[Industrial Application Field] The present invention is characterized in that a transmitting standby device and a receiving standby device, which are normally separated by a high-frequency switch on the transmitting side and a low-frequency switch on the receiving side, are connected to the active transmitting device and the active receiving device. A method for monitoring spare channels of hot standby wireless equipment that can be replaced immediately in the event of a failure (prior technology) In a conventional hot standby wireless equipment, as shown in Figure 3, the transmitting side converts the input baseband signal into a hybrid HYB
The transmission signal branched by the modulator MOD is modulated by the transmitting section TX.
10. Current equipment converts the frequency of the local oscillator output into a radio signal for transmission. and a backup device 20□, and the active transmitting device 10. The high frequency transmission power of the standby device 20. High frequency switch RF that switches to the output of
It is selected by the SW 30 and output to the antenna via a filter and a shared circulator. and switch R
Transmission backup device 20 not selected by F SW 30
The output of T is terminated with a resistor P for terminating the switch RF SW 30.

On the other hand, on the receiving side, the received signal is received by an antenna, passed through a shared circulator and filter, and then split into two by a high-frequency hybrid HYB.Although not shown, the received signal is a working device 10R and a backup device 20. The current reception output and the standby reception output of the baseband signal, which is frequency-converted to an intermediate frequency signal IP by the output of the local oscillator of each receiving unit RX and demodulated by the demodulator OEM, are connected to the reception output switch RSW 40. It is selected using the unipolar switch, converted to bipolar by the unipolar/bipolar converter, and output. In the digital multiplex radio equipment, the receiving active device 10 on the receiving side. ,
Since both of the spare devices 20g+ branch and input the same high-frequency received signal from the antenna, the unipolar received output demodulated by each demodulator OEM is used to detect errors in parity bits, etc. The quality of each reception output is checked and the reception output with the better quality is selected by the reception output switch R5W40.

[Problem to be solved by the invention]

As described above, the conventional hot standby wireless device includes the active device 10+t on the receiving side, the standby device 20. The quality of the received output of the baseband signal demodulated by each device can be checked by error detection in parity bits, etc., but the active device 10T on the transmitting side can check the quality of the received output of the demodulated baseband signal by communicating with the active device 10R on the receiving side or the backup device 20R. However, since the output of the transmission backup device 201, which is separated from the active device 110a by the high-frequency switch RFSW 30 on the transmission side, does not have a receiving system to receive the output, the transmission output level and the transmission It is only a monitor that checks the frequency, and other factors related to transmission quality, such as no modulation due to failure of the baseband transmission input modulator MOD, deterioration of the transmission characteristics of the radio frequency transmitter TX, and non-linearity of the transmitter. There has been a problem in that it is not easy to monitor increases in distortion, etc., and it is difficult to take preventive measures against such problems. An object of the present invention is to provide a method for monitoring hot standby wireless equipment that can easily check the transmission quality of not only the active transmitting equipment but also the backup transmitting equipment that is separated from the active equipment by a high-frequency switch on the transmitting side. .

[Means to solve the problem]

As shown in the principle diagram of FIG. 1, this problem involves transmitting the output of the backup device 20A, which is separated from the active device 10T by the high-frequency switch RF SW 30 on the transmitting side, to the active device 10* on the receiving side, and the backup device on the receiving side. 20. means 1 for coupling to the input of the re-device of the receiver; and the active device 10R1 of the receiving side;
0. The transmission backup device 20t is separated by the high frequency switch 30 on the transmission side, and includes means 2 for replacing the output of one of the reception local oscillators of the transmission backup device 20T with the output of the transmission local oscillator of the transmission backup device 20T. The output of the transmitting standby device 20T is input to the active receiving device and the standby device, and the frequency-converted intermediate frequency receiving output is checked using the output of the transmitting local oscillator of the transmitting standby device 20T, which has been replaced with the output of the receiving local oscillator. This problem is solved by the present invention, which monitors the transmission characteristics of the output of the transmission backup device 20T.

In the principle diagram of FIG. 1 showing the basic configuration of the backup channel monitoring method of the hot standby wireless device of the present invention, 1 is the output of the transmission backup device 20□ which is disconnected by the high frequency switch RF SW 30 on the transmission side. is coupled to the input of the re-device of the active receiving device 10R1 and the backup device 20□ on the receiving side.

2 is the receiving side re-device 10. ．． 201, for example, the output of the local oscillator RLOC of the reception section of the reception backup device 20R is transmitted to the transmission backup device 20. The local oscillator T of the transmitting section of
This is a switching means that replaces the output of the LOC.

Then, a transmission backup device 20 is disconnected by a high frequency switch 30 on the transmission side. The output of is input to the receiving section RX of both receiving devices on the receiving side, and the frequency is converted by the output of the transmitting local oscillator TLOC of the transmitting backup device 20A, which is replaced with the output of the local oscillator RLOC of the receiving section RX. It is configured to monitor the transmission characteristics of the output of the transmission backup device f20a by demodulating the intermediate frequency reception output and checking the demodulated baseband reception output.

[Effect]

The coupling means 1 of the present invention includes a high frequency switch RF on the transmitting side.
The output of the transmitting backup device 20T separated by SW 30 is sent to the receiving side's receiving active device 10R9 and the backup device 20R.
to the input of the re-device. The switching means 2 includes one of the 10 receiving side re-devices 20R, for example, the receiving spare device 20. The output of the receiving local oscillator RLOC of the transmitting local oscillator TLOC of the transmitting preliminary device 207
Replace with the output of and the spare device 2 on the sending side.
0a output and the receiving side re-device 10.20. The radio frequency signal coupled to the input of is frequency-converted to an intermediate frequency signal and demodulated to obtain a baseband signal. Therefore, the backup receiving device 20. for this demodulated baseband signal. By detecting, for example, an error in the parity bit in the received output of , wireless transmitter T
The problem is solved because deterioration failures in the transmission characteristics of X can be detected and monitored.

(Embodiment) Fig. 2 is a block diagram showing the configuration of a protection channel monitoring system of a hot standby wireless device according to an embodiment of the present invention. High frequency switch R on the transmitting side driven by the device C0NT
The transmission output of the standby device 207 separated from the active transmitting device 10 at F SW 30, for example, the level +30 dB.
Attenuator ATT that attenuates the transmission output of m to an appropriate level.
The output of the attenuator ATT is transmitted to the current device 1 on the receiving side.
08. Preliminary equipment 20. The high frequency of the input of the re-equipment is coupled to the opposite input end of the hybrid H antenna. and the receiving active device 10. l, backup equipment 2 If the input level of the OR re-equipment is -30 dBm and the branch loss of the hybrid H is 3 dB, the attenuator ATT of the coupling means l
The attenuation amount is 57 dB.

The switching means 2 of the present invention is a backup device for the receiving side active device 10R1! 20R, for example a switch S- inside the reserve device 20R, which is driven by the same controller C0NT and which is connected to the local oscillator RLO of the receiver RX of the reserve device 20R.
The output of C is replaced with a branch output of the hybrid H of the output of the local oscillator TLOC for transmission of the transmission backup device 20y. Then, a signal with a level of -30 dBm, which is the output of the preliminary device 207 on the transmitting side and is attenuated by the attenuator ATT and is coupled to the input of both devices 1ON 20m on the receiving side via the high frequency hybrid H, and the mixer MI of the receiving section.
Mixed with X. Then, the frequency is converted into an intermediate frequency signal IP, and demodulated by a demodulator OEM to obtain a unipolar baseband signal.

Furthermore, the reception output switch R8 is driven by the controller C0NT.
-40, converts the unipolar signal into a bipolar signal and outputs a bipolar reception output. Therefore, by detecting, for example, a parity bit error in the received output of the unipolar baseband signal demodulated by this demodulator OEM, the output of the transmission backup device 20T, which is disconnected by the high frequency switch RF SW 30 on the transmitting side, can be detected. Failures, such as no modulation due to failure of the modulator MOD, or radio transmitter TX
There is no problem because it can detect and monitor deterioration failures in transmission characteristics.

〔Effect of the invention〕

As explained above, according to the present invention, the backup transmitting device on the transmitting side is not isolated from the transmission system, and can be looped back to either the active or backup receiving device on the receiving side to monitor its transmission characteristics. The effect of improving the reliability of the hot standby wireless device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a principle diagram showing the basic configuration of a backup channel monitoring method of a hot standby wireless device according to the present invention, and FIG. 2 is a block diagram showing the configuration of a backup channel monitoring method of a hot standby wireless device according to an embodiment of the present invention. FIG. 3 is a block diagram of a conventional hot standby wireless device. In the figure, 1 is a coupling means, 2 is a switching means, 10A is a transmitting active device, 20T is a transmitting backup device, 10 is a receiving active device, 20. 30 is a receiving standby device, and 30 is a transmitting side switch RF S-. The closed antenna is closed and the claw of the pot is 7 pieces. Figure 3

Claims (1)

[Claims] The transmitting backup device (20_T) and the receiving backup device (20_R), which are normally separated by the high-frequency switch (30) on the transmitting side and the low-frequency switch (40) on the receiving side, are connected to the active transmitting device (10_T). In a hot standby wireless device that can be replaced immediately in the event of a failure in the active receiving device (10_R), the output of the spare transmitting device (20_T), which has been disconnected by the high frequency switch (30) on the transmitting side, is connected to the active receiving device (10_R). Means (1) for coupling to the inputs of both devices of the protection device (20_R) and a receiving local oscillator (RLOC) of one of the receiving working device or the protection device (20_R);
a transmission backup device (20_T) which is separated by a high frequency switch (30) on the transmission side, comprising means (2) for replacing the output of the transmission backup device (20_T) with the output of a transmission local oscillator (TLOC) of the transmission backup device (20_T); The output of is input to either the active receiving device or the backup device (20_R), and the output of the transmitting backup device (20_R) which is replaced with the output of the receiving local oscillator is
Monitoring of a spare channel of a hot standby wireless device, characterized in that the transmission characteristics of a spare transmission device (20_T) are monitored by the reception output of an intermediate frequency whose frequency is converted by the output of a local oscillator (TLOC) for transmission of _T). method