KR100338622B1 - Method of preservation of path provisioning data tributary control unit of wdm system cold start - Google Patents

Abstract

WDM common unit including all the path information of the network and including a control unit for controlling the WDM system in response to commands from the outside, and converts the wavelength to an appropriate wavelength to transmit the XG optical signal and other signals to transmit A WDM system having a WDM slave including a plurality of channel units and a slave control unit that monitors and controls the channel units provides a method of preventing slave path setting information from being lost when a slave processor is cold started. The method for preventing the loss of the routing information includes deactivating all channel units in the corresponding WDM slave part in response to a cold start command and accessing the routing information from the WDM common part, and as path information accessed from the WDM common part. Setting a path of the channel units and setting all other setting values to a default value, and activating the plurality of channel units one by one.

Description

METHOOD OF PRESERVATION OF PATH PROVISIONING DATA TRIBUTARY CONTROL UNIT OF WDM SYSTEM COLD START}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing path alarm loss in Wavelength Division Multiplexing (hereinafter referred to as "WDM") system, and more particularly to a method for preventing path loss during cold start of a slave processor board. .

Typically, a WDM system uses an XG (giga) where X is a decimal or integer number Synchronous Digital Hierarchy (hereinafter referred to as "SDH") signal Y (where Y is 1,2,3,4, etc.). Long-distance transmission system using wavelength division multiplexing, including a common shelf for multiplexing / demultiplexing and controlling XY optical signals and a tributary shelf for wavelength conversion and control of XG SDH signals. Consists of.

When the WDM system is connected to each other in a plurality of local areas to form a network, a case may occur in which only a subordinate processor board of the WDM system of a single station operates abnormally. At this time, the operation of all the channel boards of the slave unit is maintained as it is, so that only the slave processor board can be cold started. Cold start refers to a command to configure the system path information using the system's default value (drfault value) and ignore the operator's preset value. Therefore, if a particular slave processor board of the plurality of slave processor boards accommodated in the WDM system malfunctions and starts cold, all the information of the slave processor board is set to the default value (drfault value). Even the route configuration information set in (common shelf) is sequentially set according to the channel number. In this case, the routing information of the entire network is misplaced due to the abnormal processor board of one system in the network where the multiple systems are connected, which may adversely affect all the systems of the entire network.

Therefore, if an error occurs in a specific subordinate processor due to some cause in the WDM system, there is a need to reconfigure the path by receiving a routing value currently being operated from the WDM system common unit, rather than simply performing a cold start. do. However, the current cold start method of the slave processor ignores the value set by the operator and configures the system with the default value of the system so that the path to the channels in the slave is set as the default path. There is a problem that the path mismatch occurs because the information on the path setting that is being operated is not updated at all, resulting in undesired operation of the WDM system.

Accordingly, an object of the present invention is to provide a method for preventing the loss of routing information during cold start of a slave part in a WDM system.

Another object of the present invention is to provide a method for setting a path setting of a slave part of a WDM system according to path setting information of a WDM common part when the WDM system is cold started.

The present invention for achieving the above object is a WDM common unit having all the path information of the network and including a control unit for controlling the WDM system in response to commands from the outside, and inputting XG optical signal to multiplex with other signals A cold start command in a slave routing information prevention method of a WDM system having a WDM slave including a plurality of channel units for converting and transmitting wavelengths to appropriate wavelengths and slave control units for monitoring and controlling the channel units. In response to the deactivation of all channel units in the corresponding WDM slave unit and accessing routing information from the WDM common unit, setting the paths of the channel units as the path information accessed from the WDM common unit, and all other setting values. Is set to a default value while the plurality of channel units Characterized in that the process including the activation one by one in turn.

1 is a block diagram illustrating a signal flow of a general wavelength division multiplexing system.

2 is a block diagram illustrating a communication protocol between processors in a typical wavelength division multiplexing system.

3 illustrates a cold start control flowchart according to an embodiment of the present invention.

Hereinafter, a WDM slave processor cold start control method according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, the detailed items for such configurations are described in detail in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

1 is a block diagram illustrating a signal flow of a general wavelength division multiplexing system. As shown in FIG. 1, the WDM system includes a common part (COMS) 10 and a subordinate part (CHAS) 20. The common unit 10 includes a common unit COMS, which receives up to 16 2.5G SDH signals, multiplexes the 40G signals, and outputs the multiplexed 40G signals. ODU (optical demultiplexing unit) 14 to demultiplex into 5G signals and boost amplifiers that amplify and output power levels suitable for transmitting multiplexed 40G optical signals for transmission to other systems 16) and an optical amplifier unit (OAU) having a preamplifier (18) which amplifies a signal transmitted from another system to an input of the system to a power level suitable for interpretation by the system and supplies it to the ODU (14). 22), a supervisory control unit (SCU) 24 for transmitting and receiving 2M optical signals operated for system monitoring and management separately from the 40G transmission signal, and an OWU (for transmitting and receiving operator voice channels). oderwire unit) (26) And a data communcation unit (DCU) 28 for data communication between systems, and a main control unit (MCU) 30 that monitors and controls all units of the common unit and communicates with all other processor boards in the system. It is configured to include.

In addition, the CHAS 20 receives a 2.5G optical signal and puts a number of CHUs (hereinafter referred to as CHUs) on the back of a channel unit (hereinafter referred to as CHU), which converts wavelengths into appropriate wavelengths for multiplexing with other signals. 32) and a tribute control unit (TCU) 34, which serves to monitor and control the plurality of CHUs 32. Here, when the CHU 32 is used in a 40G transmission system, the CHU 32 converts wavelengths by using a wavelength of 1510 nm with the smallest wavelength attenuation during long distance transmission and having a difference of 0.4 nm for each channel.

2 is a block diagram illustrating a communication protocol between processors in a general wavelength division multiplexing system. In FIG. 2, the NMS and the GUI are user interface terminals, and the others are the processor boards, the DCU 26, the MCU 28, and the TCU 32. At this time, the communication between the DCU 26 and the MCU 28 performs communication between processors (DPRAM-IPC) using dual port RAM, and the LLC-IPC between the MCU 28 and the TCU 32. In addition, communication between the DCU 26 and the NMS, and between the GUI and the MCU uses TCP / IP. Note that such a communication method between processors is widely used in the art and thus will not be described in detail in the present invention.

3 is a diagram illustrating a cold start control flowchart according to an embodiment of the present invention, which shows a control flowchart of the TCU () shown in FIG.

Hereinafter, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

First, the routing method in the general case in the WDM system as shown in FIG. 1 will be briefly described. The operator can route the NMS or GUI from the user interface terminal as desired.

First, when the operator issues a route setting command in the GUI, the GUI transmits the command to the MCU 28 which is the main processor unit in the WDM system in the form of a mutually promised message frame. The communication method used at this time is a TCP / IP LAN communication method for communicating with IP. If the operator issues a route setting command in the NMS, the NMS makes a command in the form of a mutually promised message frame, and delivers the command to the DCU 26 using the TCP / IP protocol, which the DCU 26 sends to the local system. If it is not a command for the local system, the controller checks whether it is the routing setting information, and delivers it to the DCU of another system, and delivers it to the MCU 28 using DPRAM (dual port RAM) for the local system. The MCU 28 inputs the path setting command generated as described above to update its own database, and supplies this data to the TCU 32 in the slave unit 20. The TCU 32 stores the path setting information, which is input as described above, in a predetermined address of a predetermined memory, and has a channel unit (CHUi) different from the path stored in the memory (where i is a quantity of 1,2,3, etc.). Is used when a channel mismatch alarm is issued when an integer of 0) is implemented. At this time, the communication between the MCU 28 and the TCU 32 has a MAC address in an Ethernet method, and is physically connected with a BNC coaxial cable.

Meanwhile, the path setting at the cold start of the WDM slave processor is as follows.

When an operator issues a TCU 32 cold start command in the slave unit 20 from a user interface terminal such as an NMS / GUI, the cold start command is provided to the TCU 32 in the slave unit 20 through the MCU 28. do. The TCU 32 initializes the entire board by resetting the internal CPU in step 33 of FIG. 3. When the CPU is reset and reinitialized and activated, the PC (progam counter) in the CPU runs as the start address of the boot ROM. In the boot ROM, it loads the program and loads the LAN device. After initializing the device, change the value of the PC to the start address. From loads the application into memory and starts it. The application program starts from the main function. Its main function is to initialize the RTC (real time clock), MFP, etc. which are not initialized in the boot ROM, set the most basic values necessary for system operation, and perform various task and message queues. create a queue, etc.

The TCU 32 performing the initialization process as described above sets all channel units CHUi to inactive in step 34 of FIG. 3 to prevent the path from being set to an incorrect value. After deactivating all the channel units (CHUi) as described above, when various tasks are generated and play a role, the TCU 32 communicates with the MCU 28 in the WDM common unit 10 in FIG. 36. In the IPC task in charge, the routing information is received from the MCU 28 in a message frame format. This operation is for receiving and resetting the path setting information values which have been operated up to now from the common part 10 in order to maintain the path information values on the entire network.

Thereafter, the TCU 32 in the slave unit 20 sets path information of each channel unit CHUi with the slave path setting message received from the MCU 28 in step 38 of FIG. 3. In addition, all the setting values other than the path setting are activated to the channel units (CHUi) one by one while setting the default values using the default values.

By the above operation, various chips are initialized until the application program is loaded in the TCU 32, and the application code is copied from the stream to the dynamic random access memory. When this operation is finished, the main routine (function) in the TCU 32 operates normally, and after the main routine starts normal operation, each task is activated to allow the system to perform normal operation for a few seconds. In this way, all channel units (CHUi) are disabled for a short time, and the path is set to the path setting value set by the operator before the cold start of the TCU and then activated again to prevent adverse effects on the entire network. .

As described above, in the present invention, after the slave processor of the WDM system is cold-started, all the channel units are deactivated, and then the path setting value set by the operator from the common MCU of the WDM system and other settings set to the default state in the system. By receiving the values and setting the paths of the channel units, it is possible to eliminate the task of loading the information contained in the common part of the WDM system to the slave processor at the code start.

Claims (1)

WDM common unit including all the path information of the network and including a control unit for controlling the WDM system in response to commands from the outside, and converts the wavelength to an appropriate wavelength to transmit the XG optical signal and other signals to transmit Claims [1] A method of preventing dependency routing information of a WDM system having a WDM slave configured with a plurality of channel units and a slave control unit for monitoring and controlling the channel units. Deactivating all channel units in the corresponding WDM slave unit in response to a cold start command and accessing routing information from the WDM common unit; And setting the paths of the channel units as the path information accessed from the WDM common part and activating the plurality of channel units one by one while setting all other setting values to default values transmitted from the common part. A method for preventing the loss of routing information in a wavelength division multiplexing system.