KR100252511B1 - Clock Supply and Control Method of Optical Transceiver Unit in Demand Dense Optical Subscriber Transmitter - Google Patents

Abstract

PURPOSE: A method for controlling a COTU(Clock and Optical Transceiver Unit) in an FLC-C(Fiber Loop Carrier-Curb) system is provided to efficiently control the COTU which is a connection device between an ONU(Optical Network Unit) and an HDT(Host Digital Terminal) constituting the FLC-C system. CONSTITUTION: An IPC controlling process(S510) relates to an IPC message transceiving. A capacity management controlling process(S520) reports a stipulated capacity coefficient to an MCCU(Main Control and Communication Unit), or changes a report period. A failure management controlling process(S530) is composed of a step of initializing each component of a COTU(Clock and Optical Transceiver Unit) and a step of reporting failures of the COTU or transmitting an operation and maintenance signal. A connection management controlling process(S540) decides a transmission to a cell bus by connection information registered in a connection table. A provision controlling process(S550) changes a setup value of a provision item or reports the setup value to the MCCU. An OAM(Operation and Maintenance) controlling process(S560) controls an OAM processor by a command of the MCCU, and performs OAM cell generating/detecting/canceling operations. A timer controlling process(S570) calculates frequencies of capacity coefficients, and performs a timer function when a failure is reported. An initialization controlling process(S580) initializes the COTU. A physical layer controlling process(S585) operates each component of the COTU, and relates to an LED lighting. A debugging controlling process(S590) performs a debugging for the COTU.

Description

Control Method for Clock and Optical Transceiver Unit in Fiber Loop Carrier-Curb Cystem

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clock providing and optical transmitting / receiving unit control apparatus in a demand dense optical subscriber transmitter, and in particular, a demand loop optical subscriber transmitter (hereinafter referred to as a Fiber Loop Carrier-Curb System). Receives a 622 Mbps optical signal transmitted from the HDT, extracts an ATM cell, transfers the cell to other devices constituting the ONU, and the other device constituting the ONU. A clock and optical transmission unit (hereinafter referred to as COTU) which multiplexes an ATM cell sent from a 622Mbps synchronous digital hierarchy frame, converts it into an optical signal, and then transmits the signal to an HDT. A method of controlling a component is provided.

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 consists of HDT installed at the telephone company side and ONU installed at the subscriber side. COTU is a device that is connected to ONU and connects HDT to the ONU, and COTU is composed of several components (devices). It is necessary to have a method for efficiently controlling each component.

Accordingly, the present invention has been made to meet the above needs, and is provided in the ONU of the FLC-C system, to provide a method for controlling each component of the COTU which is a unit that connects between the ONU and HDT. There is this.

In order to achieve the above object, a method for providing a clock and controlling an optical transmission / reception unit in a demand-density optical subscriber transmitter according to the present invention generates an IPC message and inserts the generated IPC message into an HDLC protocol to the MCCU. An IPC control process comprising: transmitting, extracting an IPC message from an HDLC protocol, receiving an IPC message, and storing and classifying the received IPC cell in a memory, and transmitting the classified IPC message to a corresponding control process; Analyzing the IPC message received in the IPC control process, reporting the prescribed performance coefficient periodically or when requested by the MCCU, and changing the reporting period of the performance coefficient from the MCCU. A performance management control process comprising changing a reporting cycle if required; Analyzing the IPC message received in the IPC control process, performing initialization for each component (device) constituting the COTU, declaring a fault state for the COTU and reporting a fault state release, and A failure management control process comprising transmitting a maintenance / maintenance signal according to a failure state of the COTU; A connection management control process comprising analyzing the IPC message received in the IPC control process and determining transmission to the cell bus according to the connection information; Analyzing the IPC message received in the IPC control process, changing a setting value for a provision item, maintaining a state for each port, determining whether to use a port, or replacing a COTU. A provision control process comprising maintaining provisioning data values, and reporting all provisioning data to the MCCU when replacing the MCCU; An OAM control process comprising analyzing the IPC message received in the IPC control process, and controlling the OAM processing unit to perform operations related to generation, detection, and release of the OAM cell; A timer control process of counting an arbitrary number of events or performing a timer function; An initialization control process comprising analyzing the IPC message received in the IPC control process and initializing a COTU; A physical layer control process comprising operating each component (device) of the COTU, and lighting a corresponding LED according to the operating state of the COTU; And a debugging control process for performing a debugging operation on the COTU.

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

2 is an overall configuration diagram of a COTU according to the present invention;

3 is a flowchart illustrating a reception operation of a COTU;

4 is a flowchart illustrating a transmission operation of a COTU;

5 is a correlation diagram between control procedures constituting the COTU control method in the FLC-C system according to the present invention.

* Explanation of symbols for main parts of the drawings

200: demand dense optical subscriber transmitter 220: ONU

300: COTU 310: cell bus connection

315: OAM processing unit 320: multiple / demultiplexer

330: address designator 340: ATM / UNI section

350: clock processing unit 351: clock synthesizing unit

352: parallel / serial signal converter 353: clock recovery unit

360: optical transceiver 370: FIFO1

371: FIFO2 380: microprocessor unit

S510: IPC control process S520: performance management control process

S530: Fault Management Control Process S540: Connection Management Control Process

S550: provision control process S560: OAM control process

S570: Timer Control Process S580: Initialization Control Process

S585: Physical Layer Control Process S590: Debugging Control Process

FIG. 1 is a network diagram of an FLC-C system. The service providers 130 that provide various services such as home shopping, games, and movies are provided through the ATM switch 100 and the FLC-C system 200. It is coupled with optical subscribers 140 requesting services.

The FLC-C system 200 is installed in a telephone station, connects the DS1 (E) signal connected to the PSTN 110 and the broadband signal based on the ATM delivered from the broadband switching network, and integrates and multiplexes the synchronous digital hierarchy. Then, the light is transmitted to the ONU 220, which is a power device, and installed in a distribution center of a dense residential area, such as an HDT 210 and an apartment complex that performs the reverse function, and received by the HDT 210. It is a FTTC (Fiber To The Curb) type service transmission platform consisting of ONU 220 which is a device that separates each subscriber signal from the signal according to a service and provides the subscriber with the function and the reverse function. The FLC-C system 200 transmits data related to the service from the HDT 210 to the ONU 220 through the optical path 230, and the existing telephone line from the ONU 220 to each subscriber 140. 150, the standard telephone service and digital service are transmitted.

The HDT 210 receives four STM-1 (Synchronous Transport Module-1) signals having a transmission rate of 155.52 Mbps from the ATM switch 100 and transmits them to the ONU 220 as STM-4 optical signals.

The ONU 220 receives the 622 Mbps optical signal transmitted from the HDT, extracts an ATM cell, transfers the cell to other devices constituting the ONU 220, and the other device constituting the ONU 220. COTU (300) performs a transmission operation to perform a function of multiplexing the ATM cell sent from the 622 Mbps synchronous digital hierarchy frame, converts it into an optical signal, and then sends it to the HDT, and aligns the information received from the subscriber to the E1 frame And, as a main control unit, the FRU (FRame Unit) which extracts the signal and information of each subscriber from the E1 frame and delivers it to the corresponding subscriber channel device, manages and controls all information of ONU, and IPC (InterProcessor Communication) with COTU It consists of MCCU (301: Main Control and Communication Unit), which transmits and receives data through, and VCU which processes video signal flowing into ATM cell and video control signal transmitted to ATM network, and EMS (120: Ele). The ment 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.

2 is a configuration diagram of the COTU 300, a cell bus connection 310 for performing the operation of connecting the COTU 300 and the ATM cell bus using cell bus switching, management, maintenance and maintenance of the FLC-C system Multiplexes 4 to 15: 1 Universal Test and Operations PHY Interface for ATM (UTOPIA) Level 1 signals of 155.52 Mbps transmitted from the cell bus connection 310 via the OAM processing unit 315 and the OAM processing unit 315 for function. The multiplexer transmits a 622.08 Mbps UTOPIA level 2 signal to the ATM / UNI unit 340, and the virtual path identifier of the ATM cell among the UTOPIA level 2 signals transmitted from the ATM / UNI unit 340. When the address of the port is determined through a VPI) value, one of four UTOPIA level 1 signals is transmitted to a predetermined port, and the multiplex / demultiplexer 320, which is composed of a demultiplexer performing demultiplexing, performs multiplexing. The port address to the demultiplexer of the And converts the STM-4 signal transmitted from the access controller 330 and the clock processor 350 through the 8-bit data bus to the UTOPIA level 2 signal through the 16-bit data bus. By using the 19.44Mhz clock supplied from the ATM / UNI unit 340 and the 19.44Mhz clock supply unit 354 which transmits data to the access control unit 330 at the ATM cell level, a 77.76Mhz clock is generated to generate an ATM / The clock synthesizing unit 351 for supplying the main clock in the UNI unit 340, the parallel / serial signal converting unit 352 for converting the parallel signal and the serial signal, and the original clock from the received STM-4 signal. The clock processing unit 350 including the clock recovery unit 353, the optical transceiver unit 360 and the cell bus connection unit 310, which perform all / optical conversion at the time of optical transmission and optical / pre-conversion at the optical reception. Clocks with different demultiplexers of the demultiplexer 320 In case of having a data rate, the first input first output (FIFO) 1 370, which is a device that allows the two devices to correctly exchange data with each other, an IPC communication unit 381 which performs serial communication between processors, and a microprocessor 382 When the ROM 383 permanently storing the operating program of the COTU 300 and the COTU 300 starts to operate, the operating program in the ROM is moved and the RAM 384 is executed. To the microprocessor unit 380 that performs the control, alarm, monitoring, and management of devices and the power supply and power failure detection unit 390 that supplies power to the COTU 300 or detects a failure of the power source. It is composed.

In addition, the MCCU 301 is a main control unit that manages and controls all information of the ONU. The MCCU 301 exchanges data with the COTU 300 through IPC (InterProcessor Communication).

FIG. 3 is a schematic flowchart of a transmission operation of the COTU 300. The cell bus connection unit 310 transmits 155.52 Mbps of data transmitted through the cell bus from each device constituting the ONU 220 such as a VCU and a FRU. The branch cell receives the ATM cell through the four cell bus switching units 311 (step S310).

The OAM cell for operation, maintenance and repair of the FLC-C system is inserted into the ATM cell-based signal received in step S310 and sent to the multiplex / demultiplexer 320 (step S315).

The multiplexer / demultiplexer 320 receives a 155.52 Mbps received signal from four cell bus switching units 311 through an 8-bit data bus, multiplexes 4: 1, and then multiplexes the ATM / 16 bit through the 16-bit data bus. The signal is sent to the UNI unit 340, and the signal transmitted from the multiplexer / demultiplexer 320 has a transmission rate of 622.08 Mbps (step S320).

The ATM / UNI unit 340, which has received a multiplexed signal having a data rate of 622.08 Mbps through a 16-bit data bus, performs various processing on the received signal, and then uses an STM-4 signal through an 8-bit data bus. The processor 100 transmits the signal to the clock processor 350 (step S330).

The clock processor 350 receiving the 622.08Mbps STM-4 signal sent from the ATM / UNI unit 340 converts the received parallel STM-4 signal into a serial signal (step S340) and transmits the signal to the optical transceiver 360. (Step S350).

The optical transceiver 360 converts the received 622.08Mbps STM-4 electrical signal into an optical signal and transmits the optical signal to the HDT 210 (step S360).

4 is a schematic flowchart of a reception operation of the COTU 300, wherein the STM-4 optical signal transmitted from the HDT 210 is received by the COTU 300 through the optical transceiver 360 (step S410), The optical transceiver 360 converts the received 622.08Mbps STM-4 optical signal into an electrical signal and sends it to the clock processor 350 (step S420).

The clock recovery unit 353 of the clock processing unit 350 restores the clock using the data of the input STM-4 serial signal, and the clock synthesis unit 351 receives the reference clock 19.44Mhz received from the 19.44Mhz clock supply unit 354. To the ATM / UNI unit 340, and the parallel / serial signal converter 352 converts the serial STM-4 signal from the optical transceiver 360 into parallel to convert the 8-bit data bus. An operation of transmitting to the ATM / UNI unit 340 is performed (step S430).

The STM-4 signal having a parallel transmission rate of 622.08 Mbps received by the ATM / UNI unit 340 passes through various signal processing processes (step S440), and is then sent to the access controller 330 through a 16-bit data bus. The access control unit 330 translates a virtual path identifier (VPI) among the header values of the ATM cell to determine which of four ports of the multiple / demultiplexer 320 is to transmit data to. (Step S450).

The 622.08 Mbps data rate signal entering the multiplexing / demultiplexing unit 320 through the access control unit 330 is demultiplexed and output as a 155.52 Mbps data rate to a port designated by the access control unit 330 (step S460).

The demultiplexed signal outputted to one port of the multiplexer / demultiplexer 320 may be configured such that when the cell bus connector 310 and the multichannel / demultiplexer 320 have different clock rates, the two devices correctly operate with each other. It is input to the OAM processing unit 315 through the FIFO unit 370, which is a device for transmitting and receiving data (step S470).

To extract the OAM cell from the signal input to the OAM processing unit 470, to perform the operation, maintenance and repair of the FLC-C system, to perform the process related to the OAM cell, and configure the ONU 220, such as VCU, FRU In order to transmit to each device, the cell bus is sent to the cell connection unit 310 (step S475).

The 155.52 Mbps signal inputted to the cell bus connection unit 310 is loaded on the cell bus by the cell bus switching unit 311 of the cell bus connection unit 310 (step S480).

5 is a correlation diagram between control processes constituting the clock providing and optical transmitting / receiving unit control method in the demand dense optical subscriber transmitter according to the present invention, and providing the clock in the demand dense optical subscriber transmitter. And an optical transceiver unit control method includes an IPC control process (S510), a performance management control process (S520), a failure management control process (S530), a connection management control process (S540), which performs a control function related to IPC (InterProcessor Communication), Provisioning control process (S550), OAM control process (S560), timer control process (S570), initialization control process (S580), physical layer control process (S585), and debugging control process (S590).

The IPC control process S510 is a process of performing a function related to high-level data link control (HDLC) protocol control to transmit information through IPC, and transmits an IPC message to the MCCU 301 for IPC message transmission. Generating, inserting the generated IPC message into the HDLC protocol and transmitting it to the MCCU 301, when receiving the IPC message, extracting the IPC message from the HDLC protocol, receiving the IPC message, and receiving the received IPC Cells are stored and sorted in a memory, and the COTU 300 transmits them to a corresponding control process to perform an appropriate operation.

Performance management control process (S520) is a step of analyzing the IPC message received in the IPC control process (S510), the number of HEC (Header Error Check) error for the ATM cell periodically, or a predetermined performance coefficient or MCCU ( Reporting to the MCCU 301 when there is a request from 301, and changing the reporting period if there is a request to change the reporting period of the coefficient of performance from the MCCU 301.

The failure management control process (S530) analyzes the IPC message received in the IPC control process (S510), and when the COTU 300 is initialized, receives various provision data from the MCCU 301 to configure the COTU 300. Performing initialization of the components (devices), if a failure in the COTU 300, declares the state of the COTU 300 as a failure state, the failure state is maintained for a forward protection period (2-3 seconds) When the failure detection state is maintained during the rear protection period (10 seconds), the failure release report, and the maintenance / maintenance signal according to the failure state of the COTU (300) .

The connection management control process (S540) comprises the steps of analyzing the IPC message received in the IPC control process (S510), and determining the transmission to the cell bus according to the connection information registered in the connection table.

Connection information management for setting / removing and activating / deactivating each connection is performed by a connection table (TRAM table) belonging to the cell bus connection 310, and up to 1024 connections can be established in FLC-C. In addition, the connection table has connection information for all information to be transmitted through the cell bus, and determines transmission to the cell bus according to the connection information registered in the table.

In the provision control process (S550), analyzing the IPC message received from the IPC control process (S510), changing a setting value for a provision item such as selecting a BER (Bit Error Ratio) threshold, for each port Determining whether the port is used or not according to the port state, when replacing the unit of the same type due to the failure of the COTU 300, the changed provision data is received from the MCCU 301 to receive an existing value. Maintaining, and in case of replacing the MCCU 301, reporting all provisioning data at the request of the MCCU (301).

The OAM control process (S560) analyzes the IPC message received in the IPC control process (S510), and when a command using the IPC message from the MCCU 301 is issued, the OAM control unit 315 controls the OAM cell. Performing operations relating to generation, detection, and release.

Timer control process (S570) is to extract the performance coefficient in the performance management control process (S520), if the calculation, calculating the number of times, and forward in the failure report in the failure management control process (S530) In the protection function, a timer function is performed.

Initialization control process (S580) consists of analyzing the IPC message received in the IPC control process (S510), and the step of initializing the COTU (300).

Physical layer control process (S585) is a step of operating each component (device) of the COTU (300), and when the COTU (300) failure, error LED red light, when the COTU (300) operation, operation LED green light, input In the event of signal failure (LOS, LOF, AIS, E-BER), it consists of a step of performing a signal error LED red light operation.

The debugging control process S590 is a process of performing debugging on the COTU 300.

Using the clock providing and optical transmitting / receiving unit control method in the demand-density optical subscriber transmitter according to the present invention, it is a connection device between the ONU 220 and the HDT 210 constituting the FLC-C system 200. The COTU 300 can be efficiently controlled.

Claims (1)

Generating an IPC message, inserting the generated IPC message into the HDLC protocol and transmitting it to the MCCU 301, extracting the IPC message from the HDLC protocol, receiving the IPC message, and storing the received IPC cell in memory And classifying and transmitting the classified information to the corresponding control process. Analyzing the IPC message received in the IPC control process, reporting the prescribed performance coefficient periodically or when requested by the MCCU 301, and from the MCCU 301 If there is a request to change the reporting period of the performance coefficient, the performance management control process comprising the step of changing the reporting period; Analyzing the IPC message received in the IPC control process, performing initialization for each component (device) constituting the COTU 300, declaring a fault state for the COTU 300, and releasing the fault state. A failure management control process comprising reporting and transmitting a maintenance / maintenance signal according to a failure state of the COTU 300; A connection management control process comprising analyzing the IPC message received in the IPC control process and determining transmission to the cell bus according to the connection information; Analyzing the IPC message received in the IPC control process, changing a setting value for a provision item, maintaining a state for each port, determining whether a port is used, and COTU 300 A provision control process comprising: when replacing, maintaining provisioning data values; and when replacing the MCCU 301, reporting all provisioning data to the MCCU 301; An OAM control process comprising analyzing the IPC message received in the IPC control process, and controlling the OAM processing unit 315 to perform operations related to generation, detection, and release of the OAM cell; A timer control process of counting an arbitrary number of events or performing a timer function; An initialization control process comprising analyzing the IPC message received in the IPC control process, and initializing the COTU 212; A physical layer control process comprising operating each component (device) of the COTU 300, and lighting a corresponding LED according to an operating state of the COTU 300; And A clock providing and optical transmitting / receiving unit control method for a demand-intensive optical subscriber transmitter comprising a debugging control process for performing a debugging operation on a COTU (300).

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