KR100684170B1 - Apparatus and method for dots(digital office time supply) clock switching and synchronous network process unit using the same - Google Patents

Abstract

A digital office time supply clock switching apparatus and method, and a synchronous network device using the same are provided to improve the performance of a processor by simultaneously performing a switching operation function in a single process. A synchronization signal and a state of a synchronization clock are collected to monitor whether a provided operation line has a signal failure or a synchronization clock error(S10). When the provided operation line has a signal failure or a synchronization clock error, a protection switching operation or a clock protection switching operation are simultaneously performed to a normal signal of a preliminary line to restore a service(S20,S30). A recovered digital office time supply clock is provided, and the signal protection switching result and the digital office time supply clock switching result are provided to an operation system through a central control unit(S40).

Description

Receiving synchronous clock switching device and method and synchronous network device using same {apparatus and method for DOTS (Digital Office Time Supply) clock switching and synchronous network process unit using the same}

1 is a flowchart illustrating a method of receiving slave synchronous clock switching in a synchronous network device according to the related art.

2 is a diagram illustrating a synchronous network device including a receiver slave clock switching device according to the present invention;

3 and 4 are flowcharts illustrating a method of receiving slave synchronous clock switching in a synchronous network device according to the present invention.

* Explanation of symbols for main parts of the drawings

100: synchronization signal function unit 110: input and output signal interface unit

120: synchronous signal interface unit 130: synchronous clock interface unit

140: function control unit 141: synchronization signal monitoring and control software

142 synchronous clock monitoring and control software

200: central control unit 300: operating system

400: Communication between devices 500: Operation signal input / output terminal

600: preliminary signal input and output terminals

The present invention relates to a synchronous network device, and more particularly, to an apparatus and method for receiving slave synchronous clock switching for recovering a synchronous clock in the event of a network clock failure between network elements.

Synchronous network devices are intended to deliver a lot of information and must be able to transmit the fastest and most accurately. Therefore, it is important to restore the transmission / reception data between network components without distortion. For this purpose, a network synchronizer clock, which is a reference between network components, is essential. .

In addition, there is a sub-synchronous method using a receiving slave synchronization clock as a reference clock as a method of providing a network synchronization reference clock in the synchronous network device, and more stable and reliable through a clock switching function according to a failure state of the receiving slave synchronization clock. Provides clock synchronization function.

That is, in the synchronous clock switching function, the synchronization clock interface unit collects and monitors the state of the receiving slave synchronization clock by a periodic timer, and performs a clock switching when a synchronous clock failure occurs during operation, and the result is controlled by the operator. Notify

Accordingly, in the event of a catastrophic failure in the operating line signal and the spare line signal including the receiving slave clock information, the protection switching function is performed to recover the service, and then the clock switching function is analyzed by analyzing the receiving slave clock information. To perform.

1 is a flowchart illustrating a method of receiving slave synchronous clock switching in a synchronous network device according to the prior art.

Referring to FIG. 1, the synchronization signal monitoring control software 20 transmits an operating signal state value request 22 and a preliminary signal state value to the synchronization signal interface unit 10 when the periodic signal failure monitoring timer 21 operates. The request 24 is transmitted and the operational signal state value 23 and the preliminary signal state value 25 are received to compare the signal state values 26. In this case, when a failure occurs, the signal protection switching request is performed by performing the signal protection switching request 27 and the signal recovery switching result reports 28 and 29 according to the operating system (50). 60).

In addition, the synchronous clock supervisory control software 40 sends an operation signal receiving slave clock state value request 42 and a preliminary signal receiving slave synchronization clock to the synchronous clock interface unit 30 when the periodic clock failure monitoring timer 41 operates. The status value request 44 is transmitted, and the operational signal reception clock status value 43 and the preliminary signal reception clock status value 45 are received to compare the reception slave synchronization clock status value 46. In this case, when a clock failure occurs, the receiver slave clock switching request 47 performs clock protection switching, and accordingly, the clock switching result reports 48 and 49 are transmitted to the operating system through the central control unit.

As described above, the conventional receiver slave clock switching operation is performed independently of the synchronization signal protection switching operation. That is, when the operator sets the receiving slave synchronization clock to use the system reference clock, if a line failure occurs in the received synchronization signal, the signal protection switching is performed and the receiving slave synchronization clock switching is performed independently.

Therefore, during the signal protection switching operation, the reference clock for the synchronization signal is referred to to restore the synchronization signal. Due to the temporal inconsistency of each switching operation, the instantaneous reference clock loss may occur, which may cause signal distortion and seriously affect the network service. .

Therefore, the present invention has been made in order to solve the above problems, by performing the protection switching operation simultaneously by unifying the receiving slave synchronous clock switching function to the signal protection switching function, and receiving the signal protection switching result and the clock switching result It is an object of the present invention to provide an apparatus and method for slave synchronization clock switching.

Another object of the present invention is to provide an apparatus and method for receiving slave clock switching that provides an accurate reference signal recovery and stable reference clock by applying a method of simultaneously performing the receiving slave clock switching function when the signal protection switching function is operated. .

A feature of the receiving slave synchronization clock switching method according to the present invention for achieving the above object is (a) collecting the state of the synchronization signal and the synchronization clock to monitor whether there is a signal failure or synchronization clock error of the operating line being serviced; (B) restoring a service by simultaneously performing a protection switching operation and a clock protection switching operation with a normal signal of a standby line when a signal failure and a synchronous clock error of an operating line being serviced result from the monitoring; And (c) providing the recovered receiving slave synchronization clock and notifying the operating system of the signal protection switching result and the reception slave synchronization clock switching result through a central control unit. .

Preferably, the step (a) includes transmitting a signal state value request and a received clock state value request signal to the synchronous signal interface and the synchronous clock interface when the periodic signal failure monitoring timer is operated, and the signal interface and the synchronous clock. Receiving the signal state value and the received clock state value from an interface unit, and comparing the received signal state value and the received clock state value, respectively, and monitoring whether there is a signal failure or a synchronous clock error. do.

Preferably, the signal state value is an operational signal state value and a preliminary signal state value, and the reception clock state value is characterized in that the rotation signal reception clock state value and the preliminary signal reception clock state value.

Features of the receiving slave synchronization clock switching device according to the present invention for achieving the above object is the synchronization using the input and output signal interface unit for processing the operation and preliminary signal input and output synchronization signal, and the signal input from the input and output signal interface unit A synchronous signal interface for generating and decomposing a signal, a synchronous clock interface for processing received synchronous clock information from the synchronous signal generated and decomposed, and a synchronous signal and a received synchronous clock state for constant service recovery and signal recovery. And a function control unit that monitors at the same time periodically and performs the protection switching function according to the fault state value and notifies the result.

Preferably, the function control unit periodically synchronizes the synchronization signal monitoring control software for collecting, monitoring and controlling the fault state and performance value registers of the synchronization signal of the synchronization signal interface unit, and the synchronization clock state register value of the synchronization clock interface unit. And a synchronous clock monitoring control software for collecting, monitoring and controlling the data.

A feature of a synchronous network device including a receiving slave synchronous clock switching device according to the present invention for achieving the above object is provided with an operating signal input and output terminal and a preliminary signal input and output terminal capable of transmitting and receiving a synchronization signal between network components. A plurality of synchronous signal function units having a structure of the receiving slave synchronous clock switching device, a central control unit controlling the plurality of synchronous signal function units, internal communication between the synchronous signal function unit and the central control unit; And an operating system for communicating with the operator and the outside of the device.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.

A preferred embodiment of a receiving slave synchronization clock switching device and method and a synchronous network device using the same according to the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating a synchronous network device including a receiver slave clock switching device according to the present invention. For ease of explanation, the receiving slave synchronization clock switching device is referred to as a synchronization signal function unit 101 in the block description of the synchronous network device.

As shown in FIG. 2, the synchronous network device includes a plurality of synchronization signal function units 100 having an operation signal input / output terminal 500 and a preliminary signal input / output terminal 600 capable of transmitting and receiving synchronization signals between network components, and the plurality of synchronization signal functional units 100. It consists of a central control unit 200 for controlling the synchronization signal function unit 100. The inter-device communication 400 electrically connecting the synchronization signal function unit 100 and the central control unit 200, and the operation system 300 to communicate with the operator and the outside of the device.

In this case, the synchronization signal function unit 100 generates and generates a synchronization signal using the input and output signal interface unit 110 for processing the operation and preliminary signal input and output synchronization signal, and the signal input from the input and output signal interface unit 110. A synchronous signal interface 120 for decomposing, a synchronous clock interface 130 for processing received synchronous clock information from the generated and decoded synchronous signals, and a synchronous signal and a received synchronous clock state value for service recovery and signal recovery. It is composed of a function control unit 140 for monitoring at the same time at regular intervals, and performs a protection switching function according to the fault status value and notify the result.

And the function control unit 140 and the synchronization signal monitoring control software 141 for periodically collecting and monitoring and controlling the register of the failure state and the performance value of the synchronization signal of the synchronization signal interface unit 120, the synchronization clock interface Synchronous clock monitoring control software 142 that periodically collects, monitors, and controls the reception synchronous clock status register value of the unit 130.

The reception slave synchronization clock switching method in the synchronous network device according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

3 and 4 are flowcharts illustrating a method of receiving slave synchronous clock switching in a synchronous network device according to the present invention.

Referring to FIGS. 3 and 4, first, the function controller 140 synchronizes the synchronous signal and the synchronous clock to the synchronous signal interface 120 and the synchronous clock interface 130 when the periodic signal failure monitoring timer 111 operates. It collects the state of and monitors whether there is a signal failure or a synchronous clock error of the operating line being serviced (S10).

That is, the function control unit 140 requests the operation signal state value 112 and the preliminary signal state value 114 to the synchronization signal interface unit 120, and simultaneously receives the operation signal reception slave unit to the synchronization clock interface unit 130. The clock state value request 121 and the preliminary signal receiving slave synchronization clock state value request 123 are transmitted.

Subsequently, the function control unit 140 receives the operation signal state value 113 and the preliminary signal state value 115 from the synchronization signal interface unit 120, and simultaneously receives the operation signal reception clock state from the synchronization clock interface unit 130. A value 122 and a preliminary signal reception clock state value 124 are received.

The signal state value and the received clock state value are compared with each other to monitor whether there is a signal failure or a synchronous clock error.

As a result of the monitoring, when a signal failure and a synchronous clock error of the service line being serviced occur (S20), a request for the synchronous signal protection switching and a request 125 for receiving slave synchronization clock switching is performed. The service is restored by simultaneously performing the protection switching operation and the clock protection switching operation as normal signals (S30).

Accordingly, the normal receiving slave clock of the restored reserve line is provided, and the signal protection switching result and the receiving slave synchronization clock switching result report 118 and 119 are transmitted through the central control unit 200 through the operation system ( 300).

As described above, the preferred embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Receive slave synchronization clock switching device and method and a synchronous network device using the same according to the present invention as described above has the following advantages.

First, it improves the distortion phenomenon of the signal recovery caused by the time inconsistency caused by the switching operation, thereby providing a reliable signal recovery and a stable reference clock source.

Second, the processor performance can be improved by simultaneously performing the transfer operation function in one process.

Claims (6)

(a) collecting the state of the synchronization signal and the synchronization clock to monitor whether there is a signal failure or a synchronization clock error on the service line being serviced; (b) recovering a service by performing a protection switching operation and a clock protection switching operation simultaneously with a normal signal of a spare line when a signal failure and a synchronous clock error of a service line being serviced result; (c) providing the recovered receiving slave synchronization clock, and notifying the operating system of the signal protection switching result and the receiving slave synchronization clock switching result through a central control unit. Synchronous clock switching method. The method of claim 1, wherein step (a) Transmitting a signal status value request and a received clock status value request signal to the synchronous signal interface and the synchronous clock interface when the periodic signal failure monitoring timer is operated; Receiving the signal state value and the received clock state value from the signal interface unit and the synchronous clock interface unit; And comparing the received signal state value and the received clock state value, respectively, and monitoring whether there is a signal failure or a synchronous clock error. The method of claim 2, And the signal state value is an operational signal state value and a preliminary signal state value, and the received clock state value is a rotation signal receiving clock state value and a preliminary signal receiving clock state value. An input / output signal interface unit for processing operation and preliminary signal input / output synchronization signals; A synchronization signal interface unit for generating and decomposing a synchronization signal using a signal input from the input / output signal interface unit; A synchronization clock interface unit for processing reception synchronization clock information from the synchronization signal generated and decomposed; A receiving slave device comprising a function control unit that simultaneously monitors the synchronization signal and the received synchronization clock state value at regular intervals for service recovery and signal recovery, and performs a protection switching function according to the failure state value and notifies the result. Clock switching device. The method of claim 4, wherein the function control unit A synchronization signal monitoring control software for periodically collecting, monitoring and controlling a register of a fault state and a performance value of the synchronization signal of the synchronization signal interface unit; And a synchronous clock monitoring control software for periodically collecting, monitoring, and controlling a synchronous clock state register value of the synchronous clock interface unit. A plurality of synchronization signal functional units having a structure of claim 4 and having an operation signal input / output terminal and a preliminary signal input / output terminal capable of transmitting and receiving synchronization signals between network components; A central controller for controlling the plurality of synchronization signal functions; Internal device communication for electrically connecting the synchronization signal function unit and the central control unit; A synchronous network device comprising an operating system for communicating with an operator and a device external.

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