KR100419149B1 - Synchronizing Signal Transfer Control Apparatue And Method For EMI Generating Prevention In Synchronous System - Google Patents

Abstract

Electromagnetic Interference (EMI) in a synchronous system to block the transmission of a synchronous signal to a receiving side that is in a faulty state or a receiving side not mounted in the system in order to prevent EMI from occurring due to the high frequency synchronous signal used in the synchronous system. The present invention relates to a synchronization signal transmission control apparatus and method for preventing occurrence.

The present invention relates to a synchronous system using a synchronization signal between a transmitting side and a receiving side for synchronous data transmission, wherein a failure occurs according to a status signal for a receiving side to receive the synchronization signal and a system shape signal received from an upper processor. A process for checking whether a receiver is in a fault state by analyzing a system shape signal received from a higher processor and a status signal for the receiver, the state control transmitter for blocking a transmission of a synchronization signal to a receiver that is identified as a state. and; Generating a transmission block signal for a transmission port connected to a reception side identified as being in a fault state; By performing the process of blocking the transmission of the synchronization signal to the receiving side of the failure state through the corresponding transmission port in accordance with the transmission blocking signal, it is possible to prevent the power consumption and EMI generation due to unnecessary high frequency synchronization signal transmission.

Description

Synchronizing Signal Transfer Control Apparatue And Method For EMI Generating Prevention In Synchronous System}

The present invention relates to an apparatus and method for controlling transmission of a synchronization signal for preventing EMI (Electro Management Interference) in a synchronous system. Particularly, the present invention relates to a reception state in which a failure state is prevented to prevent EMI from occurring due to a high frequency synchronization signal used in a synchronous system. The present invention relates to a synchronization signal transmission control apparatus and method for preventing EMI from occurring in a synchronous system which blocks transmission of a synchronization signal to a receiver or a receiver that is not mounted in the system.

In general, a synchronous system interworking with a synchronous transmission network using synchronous transmission as a method of transmitting a constant data includes a system for interworking a plurality of individual equipments by means of digital synchronization between stations in a modular form for exchange and large-capacity digital signal processing. There is a small digital system for performing mutual synchronization by means of a synchronization signal. For example, a synchronous system such as an exchanger includes an inter system synchronizer 10 and a plurality of subs as shown in FIG. A system (Subsystem) 20 and a plurality of user interface blocks (30) connected to each subsystem (20).

The central system synchronizer 10 extracts the system synchronization signal reproduced using a phase locked loop (PLL) from the extracted and extracted signals of the network interlocking synchronization signal so that the synchronous system can extract / reproduce the synchronization signal in the synchronous transmission network. The subsystem 20 receives the system synchronization signal from the central system synchronization unit 10 to maintain internal synchronization, and the service of the subscriber interface unit 30 from the received system synchronization signal. A synchronizing synchronization signal for digital signal processing is generated and transmitted to each subscriber interface unit 30.

The subscriber interface unit 30 processes the service data in synchronization with the interlocking synchronization signal received from the subsystem 20, and processes and uses the signal to be used internally in a state synchronized with the interlocking synchronization signal.

Here, the synchronous transmission network refers to a data transmission network for configuring data transmission and digital synchronization during the switching period, and examples of the physical E1 / T1 trunk line and the Synchronous TransPort Mode (STM) transmission network may be exemplified.

The synchronization signal transmission operation of the conventional synchronous system configured as described above is as follows.

First, the central system synchronizer 10 of the synchronous system extracts the network interlocking synchronization signal from the digital data signal received through the synchronous transmission network, and then performs a PLL process on the extracted network interlocking synchronization signal to phase the corresponding network interlocking synchronization signal. It reproduces a synchronized and highly stable system synchronization signal, where the reproduced system synchronization signal is transmitted to each subsystem 20 connected to the central system synchronization unit 10 to provide synchronization necessary for the entire system data processing.

Meanwhile, each subsystem 20 that receives the system synchronization signal from the central system synchronization unit 10 monitors the quality of the system synchronization signal, reports the signal status to the higher processor, and simultaneously sends the system synchronization signal to the subscriber interface unit. An interlocking synchronization signal for use in the digital service data processing of 30 is generated and transmitted to each subscriber interface unit 30, where the interlocking synchronization signal may be interlocked through a transmission port of the subsystem 20. The number of subscriber interface unit 30 is generated.

Accordingly, the subscriber interface unit 30 receives the interlocking synchronization signal from the subsystem 20 interworking with the synchronization signal receiving port and receives the service data signaled by the corresponding synchronization signal.

The service data is transmitted to the subscriber by the subscriber interface unit 30, and the data received from the subscriber is processed in the service signal in synchronization with the interlocking synchronization signal and then transmitted to the interworking subsystem 20.

In this case, the subscriber interface unit 30 may transmit a separate synchronization signal in connection with service data transmission to the subsystem 20.

As described above, the conventional synchronous system is synchronized to the synchronous transmission network, and the synchronization signal is also used for interworking with each subsystem 20 and the subscriber interface unit 30 in the system, and the frequency of the synchronization signal is several Mhz. In case of abnormality, if the receiving side that receives it is not impedance matched to the synchronization signal, excessive EMI (Electro Management Interference) signal generated by the high frequency synchronization signal of several Mhz or more adversely affects the whole service of the system. Severe noise components in other adjacent electronic equipment can lead to equipment malfunction.

Here, the EMI signal refers to an electromagnetic interference signal in which the radiated electric field and the magnetic field are electromagnetically coupled to generate a malfunction of the equipment. The conducted signal and the radiated interference according to the transmitted form. ).

Meanwhile, the above-described synchronous transmission network refers to a general public communication network, and the synchronous system located under the public communication network performs system synchronization functions necessary for interworking between relay stations, not domestic calls, as exchanges. / T1 trunk is used, and the synchronization signals for this purpose are 2.048Mhz (E1), 1.44Mhz (T1), and 32.768Mhz system synchronization signal devised by DPPLL (Digital Processed Phase Locked Loop) method from the corresponding synchronization signal. Is generated.

In addition, the synchronous system is connected by a cable between the central system synchronizer 10 and each subsystem 20 and between the subsystem 20 and each subscriber interface unit 30, as shown in FIG. If the receiver is not mounted in the system as the high frequency sync signal is transmitted to the corresponding receiver without any control through the cable, if the impedance is not matched, or if the receiver is in a fault state, the connection cable Even in this short circuit, the corresponding synchronization signal is transmitted to the receiver through the cable.

Therefore, in the conventional synchronous system, unnecessary power consumption occurs as a high frequency synchronization signal is transmitted to the receiving side that is not mounted in the system, that is, not in the system shape, that is, the subsystem 20 or the subscriber interface unit 30. As the synchronization signal is transmitted through the cable to the receiver that is not in the system configuration, the cable acts as a high-frequency antenna, which can act as a high-speed switching noise source, resulting in an EMI signal that can adversely affect system operation or people around. Done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to analyze whether the receiving side is in an error state by analyzing a state signal and a system shape signal for the receiving side when transmitting a synchronization signal from the transmitting side to the receiving side of the synchronous system. As a result, the transmission of the synchronization signal through the transmission port is blocked for the receiving side that is in a faulty state, thereby preventing power consumption and EMI generation due to unnecessary high frequency synchronization signal transmission.

1 is a diagram illustrating a synchronous system such as an exchange interworking with a general synchronous transmission network.

FIG. 2 is a diagram illustrating a cable connection state inside the system of FIG. 1. FIG.

3A and 3B show a central system synchronizer and subsystem according to the present invention in FIG.

FIG. 4 is a detailed block diagram of the state control transmitter of FIG. 3; FIG.

5 is a detailed block diagram of the transmission and reception state monitoring unit in FIG. 4;

6 is a flowchart illustrating a control signal transmission control operation for preventing EMI from occurring in a synchronous system according to the present invention.

Explanation of symbols on the main parts of the drawings

11, 21: state control transmitter 41: synchronization signal transmitter

42: transmission control unit 43: transmission and reception state monitoring unit

43-1: System shape analyzer 43-2: Status signal processor

43-3: Failure Status Report

A feature of the present invention for achieving the above object is a synchronous system using a synchronization signal between a transmitting side and a receiving side for synchronous data transmission, comprising: a status signal for a receiving side receiving the synchronization signal; A transmission and reception state monitoring unit for analyzing a system shape signal received from an upper processor and reporting a reception side identified as being in a failure state; A transmission control unit for generating and transmitting a transmission blocking signal for a transmission port connected to a reception side that is reported as a fault state from the transmission and reception state monitoring unit; When the transmission block signal is received from the transmission control unit is provided with a state control transmitter comprising a synchronization signal transmitter for blocking the transmission of the synchronization signal to the receiving side through the corresponding transmission port.

The transmission / reception state monitoring unit may include a system shape analysis unit configured to report received shape information by analyzing system shape signals received during initial setup or system shape change from an upper processor; A status signal processor for analyzing status signals for each receiver and reporting receiver status information; And a failure state reporting unit for integrating the reception side shape information reported from the system shape analysis unit and the reception side state information reported from the state signal processing unit to report to the transmission control unit a reception side identified as a failure state. It is done.

Another aspect of the present invention includes the steps of analyzing a system shape signal received from a higher processor and a status signal for a receiving side to determine whether the receiving side is in a fault state; Generating a transmission block signal for a transmission port connected to a reception side identified as being in a fault state; The present invention provides a method of controlling a synchronization signal transmission for preventing the occurrence of an EM eye in a synchronous system including a step of blocking transmission of a synchronization signal to a receiver in a fault state through a corresponding transmission port according to the transmission blocking signal.

Furthermore, the status signal for the receiving side may include a status signal received from the receiving side, and a status signal received from a state management unit managing a failure state for the receiving side, wherein the failure state is the receiving side. This includes the case where the cable connected to the circuit is short-circuited, the impedance of the synchronization signal is not matched at the receiving side, the service cannot be provided due to a failure inside the receiving side, and the receiving side is not mounted. Characterized in that.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The overall configuration of the synchronous system according to the present invention is the same as the configuration of the general synchronous system shown in Figure 1, but in order to prevent the generation of the EMI signal generated during transmission of the synchronous signal in the synchronous system attached to Figure 3 (a) And (b), the central system synchronizer 10 and the subsystem 20 are configured to receive status signals for the receiving side to receive the interlocking synchronization signal and system shape signals received from the operator terminal and the upper processor. Accordingly, the apparatus further includes state control transmitters 11 and 21 for blocking the transmission of the synchronization signal to the receiving side identified as the fault state.

Then, the state control transmitters 11 and 21 will be described in detail. As shown in FIG. 4, the synchronization signal transmitter 41, the transmission controller 42, and the transmission / reception state monitoring unit 43 are described. It is made.

The synchronization signal transmitter 41 transmits a synchronization signal to a receiver side interlocked through each transmission port, and when a predetermined transmission block signal is received from the transmission control unit 42, blocks the synchronization signal transmission through the corresponding transmission port. The transmission control unit 42 generates a transmission blocking signal for a transmission port connected to a receiving side that is reported to be in a fault state from the transmission and reception state monitoring unit 43, and transmits the transmission blocking signal to the synchronization signal transmission unit 41. The status monitoring unit 43 analyzes the status signal for each receiving side and the system shape signal received from the operator terminal and the upper processor, and reports the receiving side to the transmission control unit 42 that is confirmed to be in a faulty state.

In addition, the transmission / reception state monitoring unit 43 described above will be described in detail. As shown in FIG. 5, the system shape analyzer 43-1, the state signal processing unit 43-2, and the fault state report unit are illustrated. (43-3), the system shape analysis unit 43-1 analyzes the system shape signal received at the time of initial setup or system shape change from the operator terminal and the upper processor, namely whether the receiver is mounted or not. The reception side shape information is reported to the failure state reporting unit 43-3, and the state signal processing unit 43-2 analyzes the state signals of each receiving side to determine whether or not the corresponding receiving side is faulty. Is reported to the fault state report unit 43-3, and the fault state report unit 43-3 receives the shape information of the reception side reported from the system shape analyzer 43-1 and the state signal processor 43-2. To the failure state by integrating the status information The confirmed receiving side is reported to the transmission control unit 42, but if the corresponding receiving side is not mounted or is in a failure state, it is reported to the transmission control unit 42.

Referring to the synchronization signal transmission operation of the synchronous system according to the present invention configured as described above are as follows.

First, the central system synchronizer 10 of the synchronous system extracts the network interlocking synchronization signal from the digital data signal received through the synchronous transmission network, and then performs a PLL process on the extracted network interlocking synchronization signal to phase the corresponding network interlocking synchronization signal. It produces a synchronized and highly stable system sync signal.

Thereafter, the central system synchronizer 10 transmits the reproduced system synchronization signal to each subsystem 20 through the transmission port under the control of the state control transmitter 11 to provide synchronization required for the entire system data processing. At this time, the transmission and reception state monitoring unit 43 of the state control transmission unit 11 receives the status signal for the receiving side (subsystem 20) interlocked through the transmission port, and from the operator terminal and the upper processor The subsystem 20, which is identified as a fault state by analyzing the system shape signal, is reported to the transmission controller 42.

Here, the status signal for the corresponding subsystem 20 is received from a status management unit (not shown) that manages the status signal received from each subsystem 20 and the failure status for each subsystem 20. The system shape signal refers to a shape signal of whether or not each subsystem 20 is received from an operator terminal and an upper processor during initial setup or system configuration change.

On the other hand, the transmission control unit 42 of the central system synchronization unit 10 is a system synchronization with respect to the corresponding subsystem 20 when a failure state signal is received for the predetermined subsystem 20 from the transmission and reception state monitoring unit 43. In order to block signal transmission, a transmission blocking signal for a corresponding transmission port is generated and transmitted to the synchronization signal transmitter 41.

Then, the synchronization signal transmitter 41 cuts off the system synchronization signal output to the corresponding transmission port according to the transmission cutoff signal transmitted from the transmission control unit 42, and thus the subsystem 20 which is the synchronization signal receiving side. If the cable connected to the cable is short-circuited or the receiving port termination of the corresponding subsystem 20 is not impedance matched, or a failure occurs in the corresponding subsystem 20, the system synchronization signal, which is a high frequency synchronization signal of several Mhz or more, is applied. It does not transmit to the subsystem 20 side, it is possible to prevent the generation of the EMI signal.

On the other hand, the subsystem 20 that normally receives the system synchronization signal from the central system synchronization unit 10 monitors the quality of the system synchronization signal, reports the signal status to a higher processor, and simultaneously sends the system synchronization signal to the subscriber interface. In order to use the digital service data processing of the unit 30 to transmit the interlocking synchronization signal to each subscriber interface unit 30 under the control of the state control transmitter 21, at this time, the state control transmitter 21 Transmitting and receiving status monitoring unit 43 is identified as a failure state by analyzing the status signal for the receiver side (subscriber interface unit 30) interlocked through the transmission port, and the system shape signal received from the operator terminal and the upper processor. The subscriber interface unit 30 is reported to the transmission control unit 42.

Here, the status signal for the subscriber interface unit 30 is a status signal received from each subscriber interface unit 30 and a state manager (not shown in the figure) for managing a failure state for each subscriber interface unit 30. The system shape signal refers to a shape signal of whether or not each subscriber interface unit 30 is received from an operator terminal and an upper processor during initial setup or system configuration change.

On the other hand, the transmission control unit 42 of the subsystem 20, when the failure status signal is received for the predetermined subscriber interface unit 30 from the transmission and reception state monitoring unit 43, the system synchronization with the corresponding subscriber interface unit 30 In order to block signal transmission, a transmission blocking signal for a corresponding transmission port is generated and transmitted to the synchronization signal transmitter 41.

Then, the synchronization signal transmitter 41 cuts the interlocking synchronization signal output to the corresponding transmission port according to the transmission cutoff signal transmitted from the transmission control unit 42, and thus the subscriber interface unit 30 as the receiving side. If the connected cable is short-circuited or the receiving port terminal of the corresponding subscriber interface unit 30 is not impedance-matched or a failure occurs in the corresponding subscriber interface unit 30, the interlocking synchronization signal, which is a high frequency synchronization signal of several Mhz or more, is applied. Since the transmission is not transmitted to the subscriber interface unit 30, EMI signal generation can be prevented.

During the above-described operation, when the reception side, that is, the subsystem 20 or the user interface unit 30 is determined to be in a failure state by the corresponding transmission / reception state monitoring unit 43, there are three main categories. If the connected cable is short-circuited, or the receiver does not match the impedance for the sync signal, or if the service cannot be provided due to a fault inside the receiver, an activated status signal is received from the receiver. When it is determined to be in a failure state, and when the status signal that manages the failure state on the receiving side is received as the status signal activated for the subsystem 20 that is determined to be in the failure state, and Receiving side from the operator terminal and host processor during initial setup or system configuration change Analysis of the shape signal for the system if there are cases where it is not already determined that the reception side is implemented.

In addition, the transmission / reception status monitoring unit 43 of the central system synchronization unit 10 or the subsystem 20, which is the transmission side, receives hardware without software processing when a status signal activated for the reception side, that is, a failure state signal, is received. It is delivered to the transmission control unit 42 in real time by the conventional connection, the status signal is a digital 'high' or 'low' level signal is a signal that does not affect the EMI.

Meanwhile, the synchronization signal transmission control operation of the state control transmitters 11 and 21 for preventing the EMI signal generation during the synchronization signal transmission in the synchronous system according to the present invention will be described with reference to FIG. .

First, the transmission / reception state monitoring unit 43 of the state control transmission unit 11 and 21 analyzes the system shape signal and the reception side state signal to check whether the receiving side is in an error state. The system shape analyzer 43-1 of FIG. 2 analyzes the system shape signal received from the upper processor during the initial setup or when the system shape is changed, and reports whether the receiver is mounted to the failure state report unit 43-3. (Step S61), the state signal processing unit 43-2 analyzes the state signal for the receiving side received from the receiving side or the state management unit to report whether or not the receiving side has a failure to the failure state reporting unit 43-3. (Step S62)

Accordingly, the failure state report unit 43-3 of the transmission / reception state monitoring unit 43 reports whether or not the reception side is mounted as reported from the system shape analyzer 43-1, and the state signal processor 43-2 reports. The failure of the receiving side is integrated to confirm whether the receiving side is in an error state (step S63).

At this time, when it is determined that the reception side is in a failure state, the transmission / reception state monitoring unit 43 reports the reception side identified as the failure state to the transmission control unit 42, and the transmission control unit 42 is in a failure state. By generating a transmission cutoff signal for the transmission port connected to the receiving side and transmitting it to the synchronization signal transmission unit 41 (step S64), the synchronization signal transmission unit 41 selects a corresponding transmission port according to the received transmission blocking signal. The transmission of the synchronization signal to the receiving side which is in the fault state through the control is interrupted (step S65).

By the way, when it is confirmed in step S63 that the corresponding receiving side is not in a faulty state, the synchronization signal transmitting unit 41 of the state control transmitters 11 and 21 moves to the receiving side through a transmission port connected to the receiving side that is not in a faulty state. The synchronizing signal is transmitted (step S66).

As described above, in a synchronous system such as an exchange interoperating with a synchronous transmission network, each internal system, that is, a transmitting side and a receiving side transmits and receives a synchronization signal for mutual interworking. Recently, a synchronous transmission network and a synchronous system provide broadband service. As it becomes ultra-high-capacity in a form to support, it is used as a synchronization signal from several Mhz to several hundred Mhz.

Therefore, when there is no short circuit or impedance matching between the corresponding systems, or when the synchronization signal cannot be received or serviced due to the failure of the receiver receiving the synchronization signal, the EMI signal is caused by the high frequency synchronization signal. This may cause the EMI of the standard to be exceeded or, in severe cases, cause malfunction of the peripheral electronic equipment.

However, when applying the present invention, if the receiving side is identified as a failure state, it blocks the transmission of the synchronous signal to the transmission port, that is, the cable connected to the corresponding receiving side, thereby preventing the occurrence of the EMI signal due to the high frequency synchronous signal. do.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention analyzes the state signal and the system shape signal for the receiving side when transmitting the synchronization signal from the transmitting side to the receiving side of the synchronous system, and confirms whether the corresponding receiving side is in a faulty state. By blocking the transmission of the synchronization signal through the transmission port, it is possible to prevent power consumption and EMI caused by unnecessary high frequency synchronization signal transmission.

Claims (8)

In a synchronous system using a synchronization signal between a transmitting side and a receiving side for synchronous data transmission, A transmission / reception status monitoring unit for analyzing a status signal for a reception side receiving the synchronization signal and a system shape signal received from an upper processor to report a reception side that is determined to be in a faulty state; A transmission control unit for generating and transmitting a transmission blocking signal for a transmission port connected to a reception side that is reported as a fault state from the transmission and reception state monitoring unit; When the transmission block signal is received from the transmission control unit is provided with a state control transmission unit comprising a synchronization signal transmission unit for blocking the transmission of the synchronization signal to the receiving side through the corresponding transmission port prevention Synchronous signal transmission control device for. delete The method of claim 1, The transmission / reception state monitoring unit includes: a system shape analysis unit configured to report received shape information by analyzing system shape signals received during initial setup or system shape change from an upper processor; A status signal processor for analyzing status signals for each receiver and reporting receiver status information; And a failure state reporting unit for integrating the reception side shape information reported from the system shape analysis unit and the reception side state information reported from the state signal processing unit to report to the transmission control unit a reception side identified as a failure state. Synchronous signal transmission control device for preventing the occurrence of EM eye in a synchronous system. The method according to claim 1 or 3, The status signal for the receiving side, the status signal received from the receiving side, and a status signal received from the state management unit for managing a failure state for the receiving side, characterized in that for synchronous system prevention Synchronous signal transmission control device. The method according to claim 1 or 3, The fault condition includes a case where the cable connected to the receiving side is short-circuited, the impedance of the synchronization signal is not matched at the receiving side, the service cannot be provided due to a failure inside the receiving side, and the receiving side. And a case in which it is not mounted. The synchronization signal transmission control apparatus for preventing the occurrence of EM eye in a synchronous system. Analyzing a system shape signal received from an upper processor and a status signal for a receiving side to determine whether the receiving side is in an error state; Generating a transmission block signal for a transmission port connected to a reception side identified as being in a fault state; And blocking transmission of a synchronization signal to a receiving side in a fault state through a corresponding transmission port according to the transmission blocking signal. The method of claim 6, The status signal for the receiving side, the status signal received from the receiving side, and a status signal received from the state management unit for managing a failure state for the receiving side, characterized in that for synchronous system prevention Synchronous signal transmission control method. The method according to claim 6 or 7, The fault condition includes a case where the cable connected to the receiving side is short-circuited, the impedance of the synchronization signal is not matched at the receiving side, the service cannot be provided due to a failure inside the receiving side, and the receiving side. And a case in which it is not mounted. The synchronization signal transmission control method for preventing occurrence of EM eye in a synchronous system.