KR100255803B1 - Control method for ds1/ds1e-atm cell bus service connection device - Google Patents

Abstract

PURPOSE: A method for controlling a DS1/DS1E-ATM cell bus access unit is provided to control and inspect DS1/DS1E dedicated lines, wherein DS1/DS1E signals are inputted and outputted, and an FLC-C(Fiber Loop Carrier-Curb) system which uses an ATM-based communication method. CONSTITUTION: Information about the ID and ports of a DS1/DS1E-ATM cell bus access unit is collected(S501). A line interface unit, an ATM cell processing unit and an OAM cell processing unit are initialized by default values(S502). Initialization associated information is reported to an MCU(S503). The MCU initializes each unit again using reported information(S504). It is checked whether an error is generated. In case that an error is generated, an alarm message is reported to the MCU(S505). If there is no error generated, an interrupt vector and an interrupt service routine are registered(S506). A communication queue to transmit and receive execution results or necessary information between each process is generated(S507). Each process is generated(S508).

Description

A method to control DS1 / DS1E-ATM interface unit

The present invention relates to a control method of a DS1 / DS1E-ATM cell bus connection device, and in particular, in a high-density optical subscriber transmission device (hereinafter referred to as a Fiber Loop Carrier-Curb System), a broadband switching network side Broadband digital video service based on ATM and Public Switched Telephone Network (110) or DS1 / DS1E signal from DS1 / DS1E leased line are connected, integrated into synchronous digital hierarchy, and multiplexed. DS1 / DS1E-ATM cell bus interface that is installed in HDT (Host Digital Terminal), a device that transmits optical fiber to ONU (Optical Network Unit) and its reverse function, and performs connection function between DS1 / DS1E dedicated line and HDT. It relates to a method of controlling.

Conventionally, an Integrated Services Digital Network (ISDN) using a digital communication method has been proposed and used as a method of integrating and communicating voice information and data information required as a general use of a computer. Coaxial cable has been used as a furnace, but coaxial cable has a problem in that it is not possible to secure bandwidth necessary for high-speed data communication or video information communication, which is rapidly expanding demand. As a solution to this problem, optical communication methods have been devised and used, and optical communication networks have been extended to all sections of the communication section. The device to realize this is the FLC-C system. In addition, the FLC-C system uses an ATM-based communication method instead of the existing packet-based communication method to increase the channel use effect, which is used to apply an ATM-based communication method to a DS1 / DS1E signal. It is necessary to control and check the connections between the DS1 / DS1E leased line and the FLC-C system.

Accordingly, the present invention has been made to meet the above needs, and a method for controlling and checking a connection device of a FLC-C system using a DS1 / DS1E dedicated line through which DS1 / DS1E signals are inputted / outputted and an ATM-based communication method. The purpose is to provide.

In order to achieve the above object, the control method of the DS1 / DS1E-ATM cell bus connection device according to the present invention comprises the steps of collecting the initialization information of the DS1 / DS1E-ATM cell bus connection device; Initializing a line connection, an ATM cell processing unit, an OAM processing unit, and a cell bus connection unit of the DS1 / DS1E-ATM cell bus connector using default values; Reporting initialization related information to the MCU; Reinitializing the line connection unit, the ATM cell processing unit, the OAM processing unit, and the cell bus connection unit of the DS1 / DS1E-ATM cell bus connector using the initialization information sent by the MCU; After performing the above reinitialization step, it checks whether an error has occurred, reports an alarm message to the MCU if there is an error, and registers an interrupt vector and an interrupt service routine (ISR) if the error does not occur. step; Creating a communication queue; And an FM process for declaring or releasing LOS and AIS; A PM process of repetitively operating at a set time interval, searching for a CV register existing for each port of an ATM cell processor, and generating a performance monitoring item; Manages the Permanent Virtual Connection (PVC) of ATM cell processing unit, performs IPC communication with ACU, sets information about each PVC to the corresponding device, checks the connection setting for each port, and checks DTP (Debugging Terminal Port) A CM process of indicating that each port is connected to which ONU through which OTRU to which the port is connected, and checking whether a loopback is currently designated and managing loopback designation / release; An OAM process of performing a PM (Performance Monitoring) function, a connection normality checking function, and a loopback function by an MCU command; An IPC transmission process of interfacing with the cell bus connection unit and the serial port unit to transmit IPC data; When an interrupt occurs for LOS and AIS on each line of the line connection unit, an event is generated by the above FM processing process. When an interrupt occurs at each port of the ATM cell processing unit, the above FM processing process To generate an event for an event, if an interrupt occurs in the OAM processing unit, generate an event for the corresponding content in the OAM process, and if an interrupt occurs in the cell bus connection unit, display the corresponding FM process; An ISR processing process for generating an event in an IPC transmission process and an IPC reception process; An IPC reception process that operates by an event generated in the ISR process and receives IPC data in the form of a control cell through a cell bus connection unit and a serial port unit, and hands over the cell bus connection unit and a serial port unit to pass an IPC message. ; And registering and executing a menu processing in a memory to perform a function of a test IPC cell transmission, a PVC setting, a loopback setting, and the like.

1 is a configuration diagram of an FLC-C system;

2 is an overall configuration diagram of a DS1 / DS1E-ATM cell bus connector;

3 is a schematic flowchart of a reception operation of a DS1 / DS1E-ATM cell bus connection device;

4 is a schematic flowchart of a transmission operation of a DS1 / DS1E-ATM cell bus connection device;

5 is an overall flowchart of a control method of a DS1 / DS1E-ATM cell bus connector;

6 is a flowchart of a message regarding an initialization process between a DS1 / DS1E-ATM cell bus interface and an MCU;

7 is a flowchart of a message regarding an initialization process between a DS1 / DS1E-ATM cell bus interface and an ACU;

8 is a schematic diagram of a line connection test according to the method of the present invention;

9 is an ATM signal processing unit test configuration diagram according to the method of the present invention.

* Explanation of symbols for main parts of the drawings

150: DS1 / DS1E leased line 200: FLC-C system

210: HDT (Host Digital Terminal) 211: ATRU

212: OTRU 213: cell bus

214: DS1 / DS1E-ATM cell bus interface 220: ONU (Optical Network Unit)

310: line connection unit 320: ATM cell processing unit

330: multiple / demultiplexer 340: cell bus connection

380: FPGA Part S520: FM Process

S530: PM process S540: CM process

S550: OAM processing S560: IPC reception processing

S570: ISR Processing S580: IPC Transmission Processing

S590: Menu Processing

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a FLC-C system. The service providers 130 that provide various services such as home shopping, games, and movies may include an ATM switch 100 and a FLC-C system 200. Through HDT 210 and ONU 220, they are connected to optical subscribers 140 requesting these services.

The FLC-C system 200 is installed in the telephone station, connects the DS1 and DS1E signals with the ATM-based broadband signals transmitted from the broadband switching network, integrates and multiplexes them into a synchronous digital hierarchy, and then uses the ONU 220, which is a power device. Installed at distribution centers in dense residential areas such as HDT 210 and apartment complexes that perform optical transmission and reverse function, and separates subscriber signals from optical signals received by HDT 210 according to services. FTTC (Fiber To The Curb) type service delivery platform consisting of ONU 220 which is a device that performs a function provided to the subscriber and its reverse function, and to provide telephone and video services to subscribers 140, HDT From 210 to the ONU 220 transmits data related to the service through the optical path 230, the standard telephone service using the existing telephone line 150 from the ONU 220 to each of the subscribers 140 Wadi It delivers the de-service.

The HDT 210 receives four STM-1 (Synchronous Transport Module-1) signals from the ATM switch 100, processes the overhead included in the STM-1 signal, extracts an ATM cell, and sends the same to the OTRU. Eight optical transceivers 212 that are in charge of the connection between the two ATRUs 211 performing the sending operation and vice versa, the cell bus 213 which is the transmission path of the ATM cell, and the HDT 210 and the ONU 220. DS1 / DS1E-ATM cell bus interface that receives DS1 / DS1E signals input from: Optical Transmit-Receive Unit) and 12 DS1 / DS1E dedicated lines and processes ATM cells and sends them to the OTRU 220 through the cell bus 213 And a DS1 / DS1E dedicated line 150 to connect DS1 and DS1E signals from a public switched telephone network (110), and to connect a digital video service from an ATM switch 100. And communication between optical subscribers 140 is based on ATM.

The ONU 220 separates each subscriber signal from the STM-4 optical signal received by the HDT 210 according to the service and provides the subscribers 140 with the service 140 and vice versa. A management system is an operator terminal, and is a device that performs functions such as failure, charging, configuration, performance, and security management according to a TMN (Telecommunication Management System) method.

FIG. 2 is an overall configuration diagram of the DS1 / DS1E-ATM cell bus connector 214, which converts received E1 data into a dual rail digital signal through a transformer, using a digital phase locked loop (DPLL), Check the operation of restoring clock and data from the dual rail RZ digital signal, declaring and releasing the LOS, and communication status to the line connection 310 of the DS1 / DS1E-ATM cell bus interface 214 that is currently operating. Three line connections 310, AMI (T1), which perform loopback operation, attenuate jitter of received data, and E1 (2.048Mbps) / T1 (1.544Mbps) signal selection operation. Three ATM cell processing unit 320 for selecting one of the HDB3 (E1) and B8ZS (T1) mode, the line return processing operation and cell return operation, the AIS generation operation, the ATM cell generation and decomposition operation , Multiplexing the ATM cells coming from the three ATM cell processing unit 320, The multi / demultiplexer 330 and the multi / reverse perform the operation of transmitting to the bus connection unit 340 and demultiplexing the cells transmitted from the cell bus connection unit 340 to the three ATM cell processing units 320. If the cell received from the multiplexer 330 is a user cell, the cell is passed as it is, and in the case of an OAM cell, a reception operation for performing operation-maintenance and its operation, and an OAM cell is generated and inserted into the transmitted digital signal. Connected to the OAM processor 335, the cell bus connection unit 340 performing the connection operation with the ATM cell bus, the IPC connection unit 361 performing the IPC (Inter Processor Communication) communication with other processes, and a PC or an operating terminal. For operation of the serial port unit 366, the CPU 362, and the DS1 / DS1E-ATM cell bus interface 214, which perform operations related to debugging and reporting of the DS1 / DS1E-ATM cell bus interface 214 through RS232. Stores each initialization data When the DS1 / DS1E-ATM cell bus interface 214 is mounted on the HDT 210, it stores initialization information and various connection information together with the ROM 363 and the ROM 363 used to perform initialization. Local RAM (364) to store, a clock generator (365) to provide the clock required for the DS1 / DS1E-ATM cell bus interface (214), and + 3.3V to the corresponding DS1 / DS1E-ATM cell bus interface (214). When the power supply 370 performs the operation of supplying + 5V power or detects a power failure, and the cell bus connection 340 is ready to send a cell, it finds it and sends it to the appropriate ATM cell processing unit 320. The FPGA unit 380 which performs the operation of routing the cell and the ATM cell processing unit 320 detects this when the cell has a cell to be transmitted, and transmits the cell when the cell bus connection unit 340 is ready to receive the cell. )

When the DS1 / DS1E-ATM cell bus interface 214 is mounted on the HDT 210 and starts operation, initialization data regarding the operation of the DS1 / DS1E-ATM cell bus interface 214 stored in the ROM 363. And the operation program is transferred to the local RAM 364, and the main operation of the DS1 / DS1E-ATM cell bus connection device 214 is started by the data and the program transferred to the local RAM 364. In addition, the IPC connection unit 361 performs Inter Processor Communication (IPC) communication between processors during the operation of the DS1 / DS1E-ATM cell bus connection unit 214, and the serial port unit 376 is connected to the PC and the operating terminal 301. Then, the RS232 operation of the DS1 / DS1E-ATM cell bus connection device 214 is performed for debugging and status reporting.

3 is a schematic flowchart of a receiving operation of the DS1 / DS1E-ATM cell bus connection device 214, which receives a DS1 / DS1E signal from a DS1 / DS1E dedicated line 150 (step S310) and receives from step S310. Converting a signal to a dual rail digital signal via a transformer (step S320), restoring the data and clock from the signal converted from step S320 (step S330), using the data and clock recovered from step S330; A step of generating an ATM cell (step S340), a step of multiplexing an ATM cell generated from step S340 (step S350), a cell multiplexed and received from step S350 is passed as it is a user cell, and if it is an OAM cell, Receiving through the step of performing operation-maintenance (step S360) and transmitting the multiplexed ATM based signal from the step S360 to the cell bus 350 (step S360). It is made smaller.

4 is a schematic flowchart of a transmission operation of the DS1 / DS1E-ATM cell bus connection device 214, in which the OTRU 212 receives an ATM cell transmitted through the cell bus 350 (step S410), Generating and inserting an OAM cell into the digital signal transmitted from step S410 (step S420), demultiplexing the signal received from step S420 (step S430), and decomposing the ATM cell demultiplexed from step S430; (Step S440), checking the ATM cell header decomposed from step S440, and performing processing such as error cell discarding (step S450); a signal that has been subjected to the header processing signal from step S450 to the DS1 / DS1E dedicated line 150; Is converted (step S460) and transmitted to the DS1 / DS1E dedicated line 150 (S470).

Hereinafter, a control method of the DS1 / DS1E-ATM cell bus connection device 214 according to the present invention will be described in detail.

FIG. 5 is a flowchart illustrating a method of controlling the DS1 / DS1E-ATM cell bus connection device 214, and collecting information about each port and an identification number of the DS1 / DS1E-ATM cell bus connection device 214 ( S501), using the default value, initializes the line connection unit 310, the ATM cell processing unit 320, the OAM processing unit 335, and the cell bus connection unit 340 (S502) and the initialization related information after the step S502. To the MCU 160 (S503) and after performing step S503, using the initialization information sent back from the MCU 160, re-initializing the above devices (S504) and performing step S504 After that, if an error has occurred, and if there is an error, an alarm message is reported to the MCU 160 (S505). As a result of the determination in step S505, an interrupt vector and an interrupt service routine are not found. (S506) registering the (ISR), the execution result between the respective processing or It generates a communication queue for sending and receiving necessary information (S507), generating each process (S508) and the control process (S515).

FIG. 6 is a flowchart of a message regarding an initialization process between the DS1 / DS1E-ATM cell bus interface 214 and the MCU 160, and the message that the DS1 / DS1E-ATM cell bus interface 214 is ready for itself. And a default initialization completion message (Wakeup_rep) including a message requesting the preparation data to the MCU 160 (step S610), the MCU 160 receiving the message transmits the DS1 / DS1E-ATM cell bus interface 214. A message (Ds1e_prov_all) having all the preparation data for the device is transmitted to the DS1 / DS1E-ATM cell bus interface 214 (step S620), after which a message about the operation of the device is exchanged with each other (step S630). .

7 is a flowchart of a message relating to the initialization process between the DS1 / DS1E-ATM cell bus interface 214 and the ACU 170, and the ACU 170 is for the DS1 / DS1E-ATM cell bus interface 214. A message to set the PVC (Ds1e_pvc_setup_12) is sent to the DS1 / DS1E-ATM cell bus interface 214 (step S710). This message (Ds1e_pvc_setup_12) is sent to 12 virtual channels (VC) and 2 remote devices (RT). Consists of data for In addition, the DS1 / DS1E-ATM cell bus interface 214 receiving the Ds1e_pvc_setup_12 message sends a response message to the ACU 170 for setting and releasing the PVC (step S720), after which a message regarding the operation of the device is sent to each other. Send and receive (step S730).

Hereinafter, the control process S515 of FIG. 5 will be described in detail.

The control process (S515) is the FM process (S520), PM process (S530), CM process (S540), OAM process (S550), IPC reception process (S560), ISR process (S570), IPC transmission processing (S580), and menu processing (S590).

FM processing (S520) is a process of processing a disturbance appearing in the DS1E signal, 175 ± 75 If the logic value '0' is continuously received for more than the bit or equivalent time, or if there is no pulse, it is declared as LOS (Loss Of Signal), logic for more than 15/4 bit (DS1 / DS1E) When the average pulse density is 12.5% / 25% (DS1 / DS1E) or more in a state other than the value '0', the LOS is released. If LOS occurs and a malfunction occurs, 500 μs Declare Alarm Indication Signal (AIS) within 2, 500 or more of 1544/2048 bits (DS1 / DS1E) are received during frame synchronization. μs Perform the operation of releasing AIS within. In addition, when LOS occurs simultaneously in the line connection unit 310 and the ATM cell processing unit 320, the line connection unit 310 is given priority, and the FM performance test report takes precedence over the PM performance test report. Is LOS> Loss Of Frame (LOF)>AIS> E-BER (Excessive-Bit Error Ratio).

The PM process S530 operates every second to search for a CV register existing for each port of the ATM cell processor 320 and to generate a performance monitoring item. The generated performance test item is a cell bus 350 Every 15 minutes, the data is reported to the MCU (Min: Control Unit) (160), and the data for performance reporting is a device number having a size of 1 byte, a port number, a port type, and a CV (Code Violation) having a size of 2 bytes. ), ES (Errored Second), SES (Severely Errored Second), and UAS (Unavailable Second).

Performance test items of the PM process (S530) are as follows.

In the DS1E signal, the cumulative number is regarded as ES, which is a cumulative number of BPVs for one second, an ES when one or more CVs occur in one second, and an SES when 2048 CVs occur in one second, for an E1 signal encoded with HDB3. SAS and UAS, which is the cumulative number of seconds in which the SES state lasts more than 10 seconds or LOS lasts, except 10 seconds when 10 consecutive non-SES occurs. In the DS1 signal, CV, which is the number of BPVs for 1 second for the T1 signal coded with HDB3, CV, which is the number of zero substitution patterns for 1 second for the T1 signal coded with B8ZS, 1 second ES, which is the cumulative number that counts as ES when one or more CVs occur, SES, which is the cumulative number that counts as SES when 1544 CVs occur during 1 second, and the cumulative number of seconds when the SES state lasts 10 seconds or longer. UAS (only 10 consecutive no When n-SES occurs, the relevant 10 seconds are excluded.) is a performance test item.

The CM process (S540) is a process of managing the PVC (Permanent Virtual Connection) by managing the VPI / VCI of the ATM cell processing unit 320 and the TRAM of the cell bus connection unit 340, IPC communication with the MCU, each PVC Set information on the device, and manages the OTRU 212 information and ONU 220 information connected to each port. In addition, by checking the connection setting for each port, it performs a function of indicating which port is connected to which ONU 220 through which OTRU 212 in the Debugging Terminal Port (DTP), and the current loopback is designated. Check to see if it manages loopback on / off. In the process of managing PVC, one VP / VC is allocated to each E1 signal, so the DS1E unit updates 12 TRAM items.

The OAM process (S550) operates by an interrupt generated when an AIS or a Far End Receive Failure (FERF) cell is detected, and the PM function, CC function, and loopback function of the OAM process (S550) are detected. Is operated by the command of the MCU (160).

The IPC reception process S560 operates by an event generated in the ISR process S570, receives IPC data in the form of a control cell through the cell bus connection unit 340 and the serial port unit 366, and receives the cell bus connection unit. It is a process of connecting the serial port unit 366 with the IPC message and delivering the IPC message. When there is no IPC received message, it is always in the standby mode.

ISR processing (S570) is an operation to generate an event to the FM processing (S520), when an interrupt occurs for the LOS, AIS in each line of the line connection unit 310, in each port of the ATM cell processing unit 320 When an interrupt occurs, an operation for generating an event for the corresponding content in the FM processing (S520), when an interrupt occurs in the OAM processing unit 335, an operation for generating an event for the corresponding content in the OAM processing (S550), And when an interrupt occurs in the cell bus connection unit 340, an operation of generating an event in a corresponding FM process (S520), an IPC transmission process (S580), and an IPC transmission process (S580). .

IPC transmission processing (S580) is operated by the FM processing (S520), PM processing (S530), OAM processing (S550), etc., by interfacing the cell bus connection unit 340 and the serial port unit 366 IPC As a process of transmitting data, a data cell is used for transmission to the MCU 160 and a control cell is used for transmission to the ACU 170.

The menu process (S590) excludes the debugging operation of the DS1 / DS1E-ATM cell bus interface 214, that is, the functions of the FM process (S520), the ISR process (S570), and the IPC receive process (S560). As a process of performing a test IPC cell transmission, a PVC setting, a loopback setting, and the like, the tester can process and operate the DTP without using the MCU 160 and the ACU 170. The menu of the menu processing process (S590) is composed of items of return point setting, PVC setting, PVC release, test IPC cell transmission, and return cell transmission. The return point setting items are line connection part 310, ATM cell processing part 320, and OAM. The return point from the processing unit 335, etc., and the PVC setting item is a function for setting the PVC for each port, and accesses the ATM cell processing unit 320 and the cell bus connection unit 340 to set the PVC. The PVC release item is an item to renew the PVC. Also, the test IPC cell transmission item is an item for transmitting a test IPC cell through the cell bus connection unit 340, and the return cell transmission item is an item for transmitting its own return cell through the cell bus connection unit 340.

8 is a test configuration diagram of the line connection unit 310 according to the method of the present invention, which is tested using each menu item provided in the menu processing step S590, wherein the ATM cell processing unit 320 and the line connection unit are tested. The black dot in the part to which the 310 connects means a loopback point. Since there are twelve port connections 310 ports in one DS1 / DS1E signal-ATM cell bus interface 214, all 12 ports are repeated.

9 is a test configuration diagram of the ATM signal processing unit 320 according to the method of the present invention, which is tested using each menu item provided in the menu processing step S590, in the cell bus connection unit 350. Test using Loopback. In addition, since one ATM cell processor 320 has four ports, the corresponding four ports of the multiplex / demultiplexer 330 are tested by simultaneously inputting signals to the four ports.

Using the control method of the DS1 / DS1E signal-ATM cell bus connector 214 according to the present invention, as shown in FIG. 2 above, the DS1 / DS1E dedicated line 150 and the HDT 210 of the FLC-C system are shown. Effective control and debugging is possible for the DS1 / DS1E signal-ATM cell bus interface 214 that connects the ATM cell buses within it.

Claims (1)

Collecting initialization information of the DS1 / DS1E-ATM cell bus interface 214; Initializing the line connection unit 310, the ATM cell processing unit 320, the OAM processing unit 335, and the cell bus connection unit 340 of the DS1 / DS1E-ATM cell bus connection unit 214 using default values; Reporting initialization related information to the MCU 160; Using the initialization information sent from the MCU 160, the line connecting unit 310, the ATM cell processing unit 320, the OAM processing unit 335, and the cell bus connecting unit 340 of the DS1 / DS1E-ATM cell bus connecting unit 214. Reinitializing the; After performing the above reinitialization step, it checks whether an error has occurred, reports an alarm message to the MCU 160 if there is an error, and if the error does not occur, an interrupt vector and an interrupt service routine (ISR). Registering a; Creating a communication queue; And FM processing for declaring or releasing LOS and AIS; A PM process of repetitively operating at a set time interval, searching for a CV register existing for each port of the ATM cell processing unit 320 and generating a performance monitoring item; Set the information on each PVC to the corresponding device, check the connection setting for each port, and display which port is connected to which ONU 220 through which OTRU 212 in the Debugging Terminal Port (DTP). A CM process of performing a giving function and managing whether loopback designation / release is maintained by checking whether a current loopback is designated; An OAM process for performing a PM (Performance Monitoring) function, a connection normality checking function, and a loopback function by the command of the MCU 160; An IPC transmission process of interfacing with the cell bus connection unit 340 and the serial port unit 366 of the DS1 / DS1E-ATM cell bus connection unit 214 to transmit IPC data; When an interrupt occurs for LOS and AIS in each line connected to the line connection unit 310 of the DS1 / DS1E-ATM cell bus connector 214, and when an interrupt occurs at each port of the ATM cell processing unit 320. Generating an event for the corresponding content by the FM processing, generating an event for the corresponding content by the OAM processing when an interrupt occurs in the OAM processing unit 335, and a cell bus connection unit. An ISR processing for generating an event by the FM processing, the IPC transmitting processing, and the IPC receiving processing when the interrupt occurs at 340; It operates by the event generated in the ISR process, receives the control cell type IPC data through the cell bus connection unit 340 and the serial port unit 366, the cell bus connection unit 340 and the serial port unit 366 IPC reception process of passing an IPC message by connecting to the network); And A method of controlling a DS1 / DS1E-ATM cell bus connection device, comprising: registering and executing a menu processing in a memory for performing a function of a test IPC cell transmission, a PVC setting, a loopback setting, and the like.

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