JPS61113326A - Line switching system - Google Patents

Abstract

PURPOSE:To simplify the line switch control system of a spare system by connecting switchingly a modulator and a demodulator of an analog signal and a digital signal to each of transmission input and reception output of a spare line. CONSTITUTION:An active analog signal is given to two systems comprising oscillators 10a,10b, transmitters 5a,5b, receivers 6a,6b, demodulators 2a,2b and signal detectors 12a,12b and an active digital signal is given to two systems comprising modulators 3a,3b, transmitters 5d,5e, receivers 6d,6e, and demodulators 4a,4b. A spare analog signal modulator 1c via distributors 7a,7b, switches SW-1,SW-2, a spare digital signal modulator 3c via distributors 7c,7d and SW-3,SW-4 and a spare transmitter 5c via an SW-A are connected between the transmitters and receivers. a spare receiver 6c is connected to spare analog signal and digital signal demodulators 2c,4c via an SW-8. If an active line is faulty, it is detected by digital and analog line switch controllers 18,16 and informed to devices 17,15 to switch the line to the spare line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal transmission line switching system. Suitable for line switching system for digital/analog common standby system in microwave wireless communication system.

[Conventional technology]

A microwave wireless communication system uses a backup line as a digital signal,
When used in common for transmission of digital and analog signals, it is necessary to separately provide a modulator/demodulator for each of the digital and analog signals, and therefore it is necessary to provide a changeover switch for selection. Therefore, digital
A line switching control device in an analog common protection system is required not only to switch connections between the working and protection lines, but also to control a changeover switch in the protection line.

[Problem that the invention seeks to solve]

The line switching control device used in the conventional line switching method is
This requirement has the disadvantage that the configuration is more complex than the switching system used in lines that transmit either digital signals or analog signals.

SUMMARY OF THE INVENTION The present invention aims to solve these drawbacks and provides a line switching system that simplifies the configuration of a line switching control device used in a digital/analog common backup system.

[Means for solving problems]

In the present invention, one or more analog working lines and one or more digital working lines are configured between a transmitting side and a receiving side,
Furthermore, in the line switching system of the wireless communication system, a small number of protection lines are configured between the transmitting side and the receiving side, and as a means to solve the above-mentioned problem, the has a configuration in which an analog signal modulator and a digital signal modulator can be connected in a switched manner, and an analog signal demodulator and a digital signal demodulator can be connected in a switched manner to the output of the receiver of the protection line. ,moreover,
The configuration is such that one of the signals of the one or more analog working lines can be switched and connected to the input of the analog signal modulator, and one of the signals of the one or more digital working lines can be connected to the input of the digital signal modulator. It is characterized by a configuration that can be switched and connected.

[Effect]

When a failure occurs in either the analog transmission line or the digital transmission line, the signal that was being transmitted through the failed transmission line is switched to the backup transmission line. The backup transmission line is provided with modulation/demodulation means used for the analog transmission line and the digital transmission line, and the modulation/demodulation means used for the transmission line to be switched is controlled so as to be connected to the backup transmission line. . As this control operation, the present invention provides a backup transmission line for transmitting a signal having a lower usage priority by using an output of a switching control means relating to a transmission path for transmitting a signal whose usage priority is given priority by the usage priority setting means. is selected from among the modulation/demodulation means by the switching means.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained based on the drawings.

The figure is a block configuration diagram showing the configuration of this embodiment system. First, the configuration of this embodiment system will be explained based on the drawings.

The first analog signal input terminal 50a is the first signal distributor 7a.
and the input of the first working line signal transmitter 10a. The first output of the first distributor 7a is connected to the input of the first analog signal modulator 1a, and the output of the first analog signal modulator 1a is connected to the input of the first transmitter 5a. The output of the first transmitter 5a is connected to the input of the first receiver 6a, and the output of the first receiver 6a is connected to the input of the first analog signal demodulator 2a.

The output of the first analog signal demodulator 2a is the input of the first working line signal detector 12a and the first analog output terminal 51.
connected to a.

The second analog signal input terminal 50b is connected to the second signal distributor 7b.
and the input of the second working line signal transmitter 10b. The first output of the second divider 7b is connected to the input of the second analog signal modulator 1b, and the output of the second analog signal modulator 1b is connected to the input of the second transmitter 5b. The output of the second transmitter 5b is connected to the input of the second receiver 6b, and the output of the second receiver 6b is connected to the input of the second analog signal demodulator 2b.

The output of the second analog signal demodulator 2b is the input of the second working line signal detector 12b and the second analog output terminal si.
connected to b.

The first digital signal input terminal 60a is connected to the third signal distributor 7
connected to the input of c. The output of the third distributor 7C is connected to the input of the first digital signal modulator 3a, and the output of the first digital signal modulator 3a is connected to the input of the fourth transmitter 5d. The output of the fourth transmitter i5d is connected to the input of the fourth receiver 6d, and the output of the fourth receiver 6d is connected to the input of the first digital signal demodulator 4a. The output of the first digital signal demodulator 4a is connected to the first digital output terminal 61a.

The second digital signal input terminal 60b is connected to the fourth signal distributor 7.
connected to the input of d. The output of the fourth distributor 7d is connected to the input of the second digital signal modulator 3b, and the output of the second digital signal modulator 3b is connected to the input of the fifth transmitter 5e. The output of the fifth transmitter 5e is connected to the input of the fifth receiver 6e, and the output of the fifth receiver 6e is connected to the input of the second digital signal demodulator 4b. After the second digital signal t[i4b output is the first digital output terminal 61b
connected to.

The second output of the first distributor 7a is connected to the first changeover switch 5h-
i, and the second output of the second distributor 7b is connected to one terminal of the second changeover switch 5W-2. The other terminal of the first changeover switch 5W-1, the other terminal of the second changeover switch 5W-2, and the output of the protection line signal transmitter 11 are connected to the input of the third analog signal modulator 1c. The output of the third analog signal modulator 1c is connected to the first terminal of the seventh changeover switch SW-^.

The second output of the third distributor 7c is the third selector switch 5W-
The second output of the fourth distributor 7d is connected to one terminal of the fourth changeover switch 7d. The other terminal of the third changeover switch 5W-3, the other terminal of the fourth changeover switch S-4, and the output of the binary code string generator 8 are connected to the input of the third digital signal converter #N3C. The output of the third digital modulator 3C is connected to the second terminal of the seventh changeover switch 5W-A.

The third terminal to the seventh changeover switch S+4- is connected to the input of the third transmitter 5c, and the output of the third transmitter 5c is connected to the input of the third receiver 6c. The output of the third receiver 6C is connected to the first terminal of the eighth changeover switch S'W-8.

The second terminal of the eighth changeover switch 5I4-B is connected to the input of the third analog signal demodulator 2c. The output of the third analog signal demodulator 2C is sent to the third working line signal detector 12c.
is connected to the input of the protection line signal detector 13, one terminal of the fifth changeover switch 5ll-5, and one terminal of the sixth changeover switch 3-6. The other terminal of the fifth changeover switch -5 is the first analog output f! i is connected to the power terminal 51a, and the sixth changeover switch 5ll-
The other terminal of 6 is connected to the second analog output terminal 51b.

The third terminal of the eighth changeover switch 5W-8 is connected to the input of the third digital signal demodulator 4c. The output of the third digital signal demodulator 4c is connected to the input of the binary code string detector 9, one terminal of the seventh changeover switch 5W-7, and one terminal of the eighth changeover switch needle-8. The other terminal of the seventh changeover switch 5W-7 is the first digital output terminal 6.
1a, and the other terminal of the eighth changeover switch 514-8 is connected to the second digital output terminal 61b.
□ The output of the receiving side line switching control device 16 is connected to the input of the sending side analog line switching control device 15, and the output of the receiving side digital line switching control device 18 is connected to the sending side digital line switching control device 170 input.

Next, the operation of this embodiment system will be explained based on the drawings.

This embodiment system is a digital/analog common backup system when the priority of the analog line is higher than the digital line, and the working line is the "2" line and the protection "1" line for both the digital and analog lines, respectively. 5"
A unidirectional line in a system consisting of lines is shown. In this configuration, independent line switching control systems are provided for digital and analog. In addition, the changeover switches 5W-A and 5W-8 in the figure are controlled by the line switching control device of the line with the higher line switching priority when both the digital circuit and the analog line are in a normal state, and the line switching priority is assigned to the protection line. The signal on the line with the lower value is transmitted.

Furthermore, this operation description is for the case where the analog side line switching control system controls the changeover switch SW- so that the digital signal is transmitted to the protection line.

Here, the control priority of the changeover switches S-^ and 5W-B is after the changeover switches S-1, 5W-2, S-5, and 5W-6.

First, a description will be given of a line switching operation when a failure occurs in a path consisting of a transmitting side device, a receiving side device, and a propagation path through which digital signal (1) is transmitted.

First, the occurrence of a failure is detected on the receiving side, and a detection signal is transmitted to the receiving side digital line switching control device 18 (operation number (1) -1). Next, after the receiving side digital line switching control device 18 confirms that the binary code string detector 9 is normal and that the backup line is normal, the receiving side digital line switching control device 18 sends the transmitting side digital line. Changeover switch 5W-3 by line switching control device 17
A control signal instructing the drive of is transmitted (operation number (1)
) -2). In the transmitting side device, the changeover switch needle -3 is driven based on this control signal, and the digital signal is transmitted to the protection line (operation number (1)-3'). Further, the receiving side device confirms that the digital signal (2) is received on the protection line (operation number (1)-4). Next, the changeover switch 5W-7 is driven and the digital signal ■ is transmitted via the backup line (operation number (1)-5).
Next, a description will be given of the line switching operation when a failure occurs in the path through which the analog signal (2) is transmitted.

First, the occurrence of a failure is detected by the receiving side device, and a detection signal is transmitted to the receiving side analog line switching control device 16 (operation number (21-1)).Next, the receiving side analog line switching control device 16 At the same time as canceling the low switching switch 5W-B, a control signal instructing to cancel the changeover switch 5W-A is transmitted to the transmitting side analog line switching control device 15.At this point, on the digital side, the backup line is in an alarm state. However, there is no effect on the working line (operation number (
2+ -2). Next, the analog line monitoring signal is transmitted via the protection line, and on the analog side, the protection line becomes normal (operation number +21-3). A control signal instructing to drive the changeover switch 5W-2 is transmitted from the receiving side analog line switching control device 16 to the sending side analog line switching control device 15 (operation number +2) -4). The transmission-side analog line switching control device 15 drives the changeover switch 5W-2 based on this control signal, and transmits the analog signal (2) to the protection line (operation number (21-5)).

In the receiving side device, after confirming that the analog signal ■ is received on the protection line, the changeover switch 5W-6 is driven, and the analog signal ■ is transmitted via the protection line (operation number (21- 6).

Next, a description will be given of a line switching operation when a failure occurs in the analog signal system after a failure occurs in the digital signal system.

First, failures in the digital signal system are relieved by the protection line according to the operations in operation numbers (1)-1 to 11-5.Next, failures in the analog signal system are relieved by operation numbers (21-1 to 21-5). It is rescued according to the operation of operation number (21-6).The digital signal that has been rescued by the protection line becomes disconnected at the time of the operation of operation number (21-2).

Next, a description will be given of the line switching operation when a failure occurs in the analog signal system and then also in the digital signal system.

First, failures in the analog signal system are relieved by the protection line according to the actions of operation numbers +21-1 to (2)-6.Since the digital side of the protection line is in an alarm state, failures in the digital signal system are relieved. is not saved.

In the line switching control method described above, priority is given to relief of the analog signal system, but when priority is given to relief of the digital signal system, the switching direction of the changeover switches 5W-A and 5W-B is changed, The present invention can also be carried out by controlling the changeover switches 5W-A and 5W-B by a digital line switching control system and transmitting analog signals to the protection line during normal operation.

〔Effect of the invention〕

As explained above, in the present invention, a signal having a lower line switching priority is transmitted to the protection line by a line switching control device having a higher line switching priority, either digital or analog, using a changeover switch in the protection line. This has the effect of simplifying the line switching control system for the digital/analog common backup system.

Additionally, when a digital line is installed alongside an existing analog line, by making simple modifications to the independent line switching control devices for digital and analog, it can be used as a line switching control device for a common backup system. This has the effect of making system configuration economical.

[Brief explanation of drawings]

The figure is a block configuration diagram showing the configuration of the system according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Analog signal modulator, 2... Analog signal demodulator, 3... Digital signal modulator, 4... Digital signal demodulator, 5... Transmitter, 6... Receiver, 7
...Distributor, 8... Binary code string generator, 9... Binary code string detector, 10... Working line signal oscillator, 1
DESCRIPTION OF SYMBOLS 1... Signal oscillator for protection line, 12... Signal detector for working line, 13... Signal detector for protection line, 15.
... Sending side analog line switching control device, 16... Receiving side analog line switching control device, 17... Sending side digital line switching control device, 18... Receiving side digital line switching control device, 50.51. 60.61...terminal,
SW...Choice switch.

Claims (1)

[Claims] (1) One or more analog working lines and one or more digital working lines are configured between the sending side and the receiving side, and a small number of protection lines are further configured between the sending side and the receiving side. In the line switching system of the wireless communication system, an analog signal modulator and a digital signal modulator can be switched and connected to the input of the transmitter of the protection line, and the output of the receiver of the protection line is connected to the input of the transmitter of the protection line. , the configuration is such that an analog signal demodulator and a digital signal demodulator can be switched and connected, and further, one of the signals of the one or more analog working lines can be switched and connected to the input of the analog signal modulator. . A line switching system, characterized in that one of the signals of the one or more digital working lines can be switched and connected to the input of the digital signal modulator.