KR100651552B1 - Method for controlling for multi-direction point to point mode synchronous digital hierarchy transmission units - Google Patents

Abstract

The present invention relates to a method for controlling a multi-directional point-to-point mode synchronous digital phase transmission unit, a plurality of synchronous digital phase transmission units and a plurality of transmission units respectively corresponding to SDH transmission units of the other system. At least one main control unit for controlling the control unit in the same chef of one system, and including a signal control / interface unit of the synchronous digital relay transmission unit, a signal control / interface unit of the digital trunk line and an input / output control unit. Stores software capable of controlling multiple transmission units. By driving the software, the main control unit operates the transmission units in the multidirectional point-to-point mode and controls the operation state thereof.

As a result, the present invention enables to mount three or more SDH transmission units in one chef, thereby minimizing installation area, minimizing power consumption, and significantly reducing maintenance costs.

SDH

Description

Control method of multi-directional point-to-point mode synchronous digital control unit {METHOD FOR CONTROLLING FOR MULTI-DIRECTION POINT TO POINT MODE SYNCHRONOUS DIGITAL HIERARCHY TRANSMISSION UNITS}             

1 is a block diagram of a point-to-point mode system using a conventional unidirectional synchronous digital hierarchy.

2 is a diagram of a point-to-point mode system using a conventional two-way synchronous digital hierarchy.

3 is a block diagram of a multi-directional point-to-point mode synchronous digital hierarchy transmission system according to the present invention.

Figure 4 is a chef diagram of a multi-directional point-to-point mode synchronous digital hierarchy transmission system according to an embodiment of the present invention.

5 is a block diagram showing the configuration of the main control unit according to the present invention;

6 is a flowchart showing the operation of the main control unit according to the embodiment of the present invention;

7 is a flow chart showing the detailed operation of step s114 of FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to synchronous digital hierarchy (SDH) transmission, and more particularly to a method for controlling a multidirectional point to point mode synchronous digital hierarchy transmission unit.

As recommended in International Telecommunication Union-Telecommunications (ITU-T) G.707, Synchronous Digital Network (SDH) is a standard technology for transmitting synchronous data on optical media. It is internationally equivalent and implemented with various Synchronous Transfer Modules (STM) depending on the speed of the optical carrier. Typically, the synchronous digital hierarchy is responsible for layer 1 functions in a unidirectional node interface (UN) protocol composed of layers 1 to 3 to connect a network and a terminal in a broadband integrated information network (B-ISDN). do.

1 is a block diagram of a point-to-point mode system using a conventional synchronous digital hierarchy. Referring to FIG. 1, the first and second units 1 and 2 are connected to each other via an optical cable 3, and the signals of the optical cable 3 are commonly known as DS1 (Digital Signal Level 1) or DS1E / E1. This is a synchronous digital relay transmission device that performs the function of connecting digital relays.

The system shown in FIG. 1 only supports a 1: 1 connection, which has evolved from that shown in FIG. Referring to FIG. 2, the first and second units 21, 22 of one system 20 are connected to the third and fourth units 31 of the other system 30 via corresponding optical cables 11, 12. (32) and is a synchronous digital transmission device that performs the function of connecting the signals of the optical cable (11) (12) to the corresponding digital relay line (23) (24) (33) (34). In one system 20 the first and second units 21, 22 are mounted on the same one chef and controlled by the same main control unit (not shown). The configuration of the other system 30 is also the same.

In the control method of the synchronous digital control unit according to the prior art configured as described above, since only the main control unit can control up to two units, there can only be two units connected from one system to the other system. Therefore, in order to connect the points between 2: 2 and above, many chefs and systems were required to be installed, thereby increasing the installation area and increasing the economic burden. In addition, the installation of a number of chefs had a problem that consumed a lot of power consumption and maintenance costs.

Accordingly, an object of the present invention, which is designed to solve the problems of the prior art operating as described above, is to provide a multi-directional point-to-point mode synchronous digital phase transmission unit capable of constructing multiple synchronous digital phase transmission units in one chef. It is to provide a control method.

Another object of the present invention is to provide a method for controlling a plurality of synchronous digital transmission units mounted on the same one chef.

An embodiment of a control method of a multi-directional point-to-point mode synchronous digital phase transmission unit according to the present invention, which has been devised to achieve the object as described above,

Mounting a plurality of synchronous digital phase transmission units corresponding to synchronous digital phase (SDH) transmission units of the other system and at least one main control unit controlling the plurality of transmission units in the same shape of one system;

Storing software capable of controlling the plurality of transmission units in a storage unit of the main control unit including a signal control / interface unit of a synchronous digital boundary transmission unit, a signal control / interface unit of a digital relay line, and an input / output control unit;

Controlling, by the software, the main control unit operating the transmission units in a multi-directional point-to-point mode and controlling the operating state thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In describing the operating principles of the preferred embodiments of the present invention in detail with reference to the accompanying drawings, when it is determined that the detailed description of the related well-known functions or configurations may unnecessarily obscure the gist of the present invention, the detailed description will be given. Will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

3 is a block diagram of a multi-directional point-to-point mode synchronous digital hierarchy transmission system according to the present invention. Referring to FIG. 3, the first to Nth units 52 to 54 of one system 50 may be connected to the third to Mth units 62 to 54 of the other system 60 through corresponding optical cables 41 to 43. 64 is a synchronous digital phase transmission unit (hereinafter referred to as a transmission unit) that performs a function of connecting the signals of the optical cables 41 to 43 to the corresponding digital relay lines 55 to 57 and 65 to 67.

In one system 50, the first to Nth transfer units 52 to 54 are mounted on the same one chef 50 and controlled by the same main control unit 51. The main control unit 51 controls the transmission units 52 to 54 so that each transmission unit normally transmits a signal. Since the configuration and operation principle of the other side system 60 are the same, specific operation principles of the present invention will be described below with respect to one side system 50.

The 16 synchronous digital transmission units can implement a bidirectional (BI) point-to-point mode in up to 16 directions when configured with only 16 working units that are responsible for transmitting and receiving current signals. In the case of the failure of the working unit, when configured with eight protection units that perform the function of the working unit instead, a bidirectional point-to-point mode of up to eight directions may be implemented. In Unidirectional (UN) mode, one working unit may only be responsible for receiving the current signal and one protection unit may or may not be responsible for transmitting the current signal.

The transmission unit performs conversion between the optical cable and the digital relay line as a minimum unit component capable of processing a transmission or reception signal. The chef, in which a plurality of transmission units are mounted, is a minimum unit that combines the transmission units to perform a basic function, and one chef includes one or more pairs of working / protecting units (or one or more working units) and a main controller unit for controlling them. It is composed of a structure for supplying power by mounting the units.

Figure 4 shows the chef configuration diagram of the multi-directional point-to-point mode synchronous digital hierarchy transmission system according to an embodiment of the present invention. Referring to FIG. 4, 16 transport units and one main unit controlling them are mounted on the same one chef.

The main control unit performs a function of managing and controlling information on all transmission units in the corresponding chef. A detailed configuration thereof is as shown in FIG.

Referring to Figure 5 will be described in more detail the configuration and operation principle of the main control unit according to an embodiment of the present invention. The clock generation controller 130 provides various clocks required for synchronization. The STM signal control and interface unit 140 performs STM signal control and interface, and the DS1 / DS1E signal control and interface unit 150 performs DS1 / DS1E signal control and interface. Here, STM-1 is an optical carrier (OC) 155.250 Mbps signal of the SDH and DS1 / DS1E is a North American 1.544 Mbps signal / European 2.048 Mbps signal.

The main controller 100 may include a central processing unit (CPU) 110, an erasable programmable read only memory (EPROM) 112, a dynamic random access memory (DRAM) 114, a static random access memory (SRAM) 116, Non-Volatile Random Access Memory (NVRAM) 118 and Flash Read Only Memory (FROM) 120.

CPU 110 performs the overall control of the present invention. EPROM 112 is equipped with a data RTOS (Real Time Operating System) for booting at start-up, DRAM 114 is used for the entire data storage, SRAM 116 is a high-speed processing It is used for storing data necessary for. NVRAM 118 is used for the necessary data backup.

The FROM 120 carries various software packages. In other words, it is equipped with software for OAM & P (Operation Administration Maintenance & Provision) functions such as software for total chip control, software for STM signal controller, software for DS1 / DS1E signal controller, and software for clock generation controller.

OAM & P function software according to an embodiment of the present invention is a system embedded RTOS, alarm monitoring and control, provision (initial value setting), control for operation setting and release of each device, communication module (RS232C) , RS422, TCP / IP, etc.) and device (ASIC, FPGA) drive, database management, and so on. The main control unit also includes a power supply 122, a buffer / gate IC 124, and a watch dog circuit 126.

6 is an operation flowchart of a main control unit according to an embodiment of the present invention.

5 and 6 together, the main controller 100 performs a system start-up when a system on or reset control is received by the user in step s102, and the system start-up is normally completed in step s104. Judge whether or not. If the system start-up is completed normally, in step s106, the database is created, deleted and managed by the operation of the OAM & P function software, the various tasks are created, monitored and controlled, and the user interface module is generated and Perform management.                     

The system startup process in the step (s102) is as follows. Power is supplied to each piece of hardware by the power supply 122, and the EPROM 112 completes the setup in the boot mode, and the CPU 110 supplies data to the FROM 120, the DRAM 114, the SRAM 116, and the like. The level at which normal control is possible should be reached. That is, EPROM 112 is initialized and OAM & P function software stored in FROM 120 is transferred to DRAM 114.

In addition, the operation in step s106 is as follows. When the software is executed in the DRAM 114, data requiring high-speed processing by the OAM & P function is transferred to the SRAM 116, and data that needs to be stored even at power on / off is stored in the NVRAM 118. . This overall control is performed by software stored in the FROM 120, and step S102 to step S106 of Fig. 6 correspond to the system initialization process.

After performing step s106 of FIG. 6, the main control unit 100 determines whether there is a provision request for transmitting the synchronous digital hierarchy of the user in step s108, and if there is a provision request, the backup is performed in step s110. Determine if you need to recover data. Backup data recovery is required when recovery to a previously operated state is required. When backup data recovery is required, the backup data is restored to the previous environment by using the backup data stored in the NVRAM 118 in step s112 and step s114. Proceed to). If it is determined in step S110 that there is no need to restore the backup data, the process proceeds directly to step S114.

In step s114, the synchronous digital phase transmitting units perform the synchronous digital phase transmitting operation and the main control unit performs the control operation. The flow of the synchronous digital phase transfer operation performed in step s114 is shown in FIG.                     

A subroutine control operation for performing a synchronous digital phase transmission operation will be described in detail with reference to FIG. 7. In step s202 of FIG. 6, the main control unit corresponds to each unit, that is, each of the STM-1 (155M) / STM-0 (51M) signal control and interface unit 140 and the DS1 / DS1E signal control and interface unit 150. Initialize to optical carrier mode. Subsequently, in step S204 to step S220, a determination for comparison with the previous mode is performed.

First, in step s204, state monitoring is performed in the point-to-point mode to determine whether a state change occurs in each transmission unit. If a state change occurs, the process proceeds to step s206. In step s206, it is determined whether the generated change is alarm related content. If the alarm-related content proceeds to step s208 to report the corresponding alarm status to the OAM & P function (software), and in step s214 allows the OAM & P function to process it.

If it is not the alarm related content in step s206, the process proceeds to step s210 to determine whether the generated state change is control related content. If the content is related to control, the process proceeds to step S212 to perform a corresponding control, and in step S214, the OAM & P function processes it.

If it is not the control-related content in step s210, it is determined whether the system state is abnormal in step s216. If the system is abnormal, the process proceeds to step s218 to store the system abnormal state information, and reports the state to the OAM & P function in step s224.

If the generated state change in step s216 is not a system error, the process proceeds to step s220 to determine whether a provision state change is made. If the provisioning state changes, the process proceeds to step s222 to store provisioning state information, and reports the state to the OAM & P function in step s224.

If the generated state change in step s220 is not a provision state change, the process proceeds to step s226 to perform exception state processing, and in step s214, the OAM & P function processes it.

6, the main controller 100 determines whether the system operates normally in step s116 after performing the same functions as described above with reference to FIG. 7. If the system does not operate normally, the main controller 100 proceeds to step s118, outputs a system failure, and returns to step s102. If the operation is normal, it is determined in step S118 whether there is a provision change request from the user. If there is a provision change request, the process returns to step s108. However, if there is no provision change request in step s118, the process proceeds to step s120 to perform the operation of the previous provision mode.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative of the disclosed invention are briefly described as follows.

According to the present invention, three or more SDH transmission units can be mounted in one chef, thereby minimizing installation area, minimizing power consumption, and significantly reducing maintenance costs.

Claims (4)

At least three or more synchronous digital phase transmission units corresponding to the SDH transmission units of the other system and at least one main control unit controlling the at least three or more transmission units are mounted in the same shape of one system. Doing; Storing software capable of controlling the at least three transmission units in a storage unit of the main control unit including a signal control / interface unit of a synchronous digital boundary transmission unit, a signal control / interface unit of a digital relay line, and an input / output control unit; And operating the transmission units in a multi-directional point-to-point mode by the driving of the software and controlling the operating state thereof. The method of claim 1, wherein the controlling comprises: Performing a system initialization; Initializing a signal control / interface unit, a signal control / interface unit, and an input / output control unit of a digital relay line constituting the main control unit to an operation mode; Performing state monitoring in a point-to-point mode to determine whether a state change occurs in a transmission unit having a redundant structure with the at least three working units and protection units; And performing a corresponding alarm-related operation, a control-related operation, and a system state abnormality-related operation according to the determination result of the generated state change. The method of claim 2, further comprising: determining whether it is necessary to restore backup data before initializing the main unit; And restoring to the previous environment by using the previously stored backup data when the backup data recovery is necessary as a result of the determination. The method of claim 3, wherein performing the system initialization comprises: When the system is normally started up, multi-directional point-to-point, which generates, deletes and manages a database by operating the software, creates, monitors and controls various tasks, and creates and manages user interface modules. Control method of mode synchronous digital hierarchy transmission unit.

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