KR100704111B1 - Data process apparatus and method for transmission convergence layer of Passive Optical Network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a data processing apparatus and method for a transmission convergence layer function in a passive optical branch network.

2. The technical problem to be solved by the invention

The present invention includes a transmission convergence layer (TC) layer function module in the broadband office device (OLT) and a transmission convergence layer function module in the plurality of optical subscriber access devices (ONU), respectively, wherein the broadband master device (OLT) side has a TC master function. To provide a data processing apparatus for a transmission convergence layer function and a method and a computer readable recording medium recording a program for realizing the method.

3. Summary of Solution to Invention

The present invention relates to a data processing method for a transmission convergence layer function in a passive optical branch network (PON), comprising: a plurality of subscriber sides connected to the broadband station apparatus (OLT) and the broadband station apparatus (OLT). A first step of having a transmission convergence (TC) layer functional module in each of the optical subscriber access units (ONUs) which are devices; The uplink and downlink frames for the transmit convergence (TC) layer function are formed by using the transmission convergence layer function module on the OLT side as a master and the transmission convergence layer function module on the optical subscriber access device (ONU) as a slave. A second step of processing; And a third step of performing bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging function, and MAC function according to the processing result of the second step.

4. Important uses of the invention

The present invention is used for passive optical networks.

Passive Optical Network (PON), Transmission Convergence (TC) Layer Function Module, OLT, ONU, PLOAM

Description

Data processing apparatus and method for transmission convergence layer function in a passive optical branch network {Transmission convergence layer of Passive Optical Network}             

1 is an exemplary configuration diagram of a passive optical branch network system to which the present invention is applied.

2 is a configuration diagram of an embodiment of a data processing apparatus for a transmission convergence layer function in a passive optical branch network according to the present invention.

FIG. 3 is a diagram illustrating a detailed operation of a framer that performs core functions in the data processing apparatus of FIG. 2. FIG.

* Explanation of symbols for the main parts of the drawings

21: core part 22: clock generator

23: line driver 24: optical transceiver section

The present invention relates to a data processing apparatus and method for a transmission convergence layer function in a passive optical network (PON), and more particularly, to a transmission convergence (TC) in a plurality of optical subscriber units (ONUs). A data processing apparatus and method for a transmission convergence layer function, each having a hierarchical function module, wherein an optical line termination (OLT) side performs a TC master function, and an optical subscriber access device performs a TC slaver function. A computer readable recording medium having recorded thereon a program for realizing the method.

Asynchronous Transfer Mode-Passive Optical Network (ATM-PON), which is considered as a typical PON, is a signal that passes downwards through a splitter through a single optical cable connected to an OLT installed in a company. It is branched into 64 optical cables and broadcast to ONU.

In contrast, signals transmitted by several ONUs are multiplexed onto one optical cable through a combiner and transmitted to the OLT. The distance between the OLT and the ONU is up to 20 km, and depending on the installation location and capacity of the ONU, FTTCab (Fiber-to-the-Cabinet), FTTC (Fiber-to-the-Curb), and FTTB (Fiber-to-the-) FTTH (Fiber-to-the-Home), which is deployed in the home, such as FTTH, is called ONT (Optical Network Termination). The transmission rates support 155.52 and 622.04 Mbits / s for the downlink and 155.52 Mbits / s for the upstream. It is also possible to provide any bandwidth up and down within the capacity given to a particular ONU.

On the other hand, in order to implement ATM-PON, it is essential to implement a transmission convergence layer function module that handles the unique functions of the PON. TC function modules include bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), It performs ranging, medium access control (MAC), and security functions. Among them, ranging and MAC functions are classified as core functions of TC function module. The downlink signal of ATM-PON is branched and broadcast through a splitter, so there is no particular difficulty except for security. However, since the signals sent by the ONUs are multiplexed after passing through the combiner, which is a passive element, the distance between each ONU and the OLT (0 to 20 km), even if the OLT specifies which time slot to use for a particular ONU. Different numbers may cause collisions between cells. In addition, ATM-PON must avoid collisions to efficiently use link capacity and maintain service quality, but splitters and combiners implemented with passive elements for low price and easy maintenance cannot solve this problem. There was this.

Thus, the OLT detects a newly registered ONU, measures its distance, and then assigns an equalized delay, which is the time the ONUs wait before sending the cell, so that all ONUs are virtually at the same location. To make it visible, this is called ranging.

However, the MAC protocol in ATM-PON is a technology that dynamically provides various bandwidths required by multiple ONUs and has not been standardized yet. The MAC protocol consists of an Grant Request Protocol (hereinafter referred to as GRP) and an Grant Distribution Algorithm (hereinafter referred to as GDA). GRP is a procedure and process required for the ONU to transmit its information to the OLT in order to be allocated a timeslot for cell transmission upward, and the OLT accordingly provides the cell transmission acknowledgment. And before the OLT issues the approval, the GDA is a method of gathering the information sent by the ONUs and distributing the approval in an appropriate way. The downlink frame of ATM-PON according to the international standard consists of 56 timeslots and is repeated periodically. Each timeslot has a size of 53 bytes, which has the same structure as a general cell. In the uplink frame, 53 timeslots are repeated. Each timeslot has a size of 56 bytes, and is composed of an overheader of 3 bytes and a cell of 53 bytes. The 3-byte header is used to maintain the spacing between two consecutive cells that are conveyed upwards and to perform bit and byte synchronization tasks.

The first and twenty-ninth timeslots of the 56 cells of the downlink frame are periodically occupied by PLOAM cells. The PLOAM cell header is the same as a general physical layer cell, but the payload identifier is 110 coded to indicate that it is a special OAM (Operation And Maintenance) cell used in ATM-PON.

Unlike downlink frames, timeslots of uplink frames may be filled with user cells, uplink PLOAM cells, and split slots, depending on what the OLT specifies. Among them, the split slot occupies an upward 56-byte timeslot, which is filled with one or more minislots to save link capacity. This minislot contains an ONU controlled by the OLT or an entity requesting approval.

Therefore, the payload length of the current minislot is 1 to 53 bytes, and the exact length and frequency of use are not defined yet, which leads to confusion in implementation and obstacles to device standardization. It is urgent to develop transmission convergence layer functional modules including ranging and MAC functions.

The present invention has been proposed in order to solve the above problems, and is provided with a transmission convergence layer function module in an OLT and a transmission convergence layer function module in a plurality of optical subscriber access devices (ONU), respectively. The broadband station device (OLT) side reads the TC master function, and the optical subscriber access device performs the TC slaver function. The data processing device for the transmission convergence layer function and its method and the program for realizing the method are read by a computer. The purpose is to provide a recording medium that can be used.

In order to achieve the above object, the present invention provides a data processing apparatus for a transmission convergence layer function in a passive optical branch network (PON), in a broadband station apparatus (OLT), which is a station side, and in the broadband station apparatus (OLT). Each of the plurality of subscriber side devices connected to each other is provided in an optical subscriber access device (ONU), and the broadband subscriber station (OLT) side as a master and the optical subscriber access device (ONU) side as a slave (Ranging) Performs a Convergence (TC) layer function, which includes a function and a medium access control (MAC) function, processes up and down frames, bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging function A transmission convergence layer function processing means for performing a MAC function and recovering data from an upwardly flowing signal; Converts a downlink frame from the transmission convergence layer function processing means and transmits it to another data processing apparatus through an optical transceiver unit, and converts an uplink frame from the other data processing apparatus introduced through the optical transceiver unit to convert the uplink frame. Signal conversion means for transmitting to the processing means; And clock providing means for providing a multi-phase clock and a byte clock to the transmission convergence layer function processing means and the signal conversion means.

In addition, the present invention is a data processing method for a transmission convergence layer function in a passive optical branch network (PON), a plurality of devices connected to the broadband station device (OLT) and the broadband station device (OLT), which is a station side device. A first step of providing a transmission convergence layer functional module in an optical subscriber access unit (ONU) that is a subscriber side device; The uplink and downlink frames for the transmit convergence (TC) layer function are formed by using the transmission convergence layer function module on the OLT side as a master and the transmission convergence layer function module on the optical subscriber access device (ONU) as a slave. A second step of processing; And a third step of performing bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging function, and MAC function according to the processing result of the second step. It is done.

The present invention also provides an optical subscriber access device (ONU), which is a plurality of subscriber-side devices connected to a broadband optical device (OLT), which is a country-side device, and to the broadband optical device (OLT), in a passive optical splitter network having a processor. A first function having a transmission convergence layer function module in each of the Cx's; The uplink and downlink frames for the transmit convergence (TC) layer function are formed by using the transmission convergence layer function module on the OLT side as a master and the transmission convergence layer function module on the optical subscriber access device (ONU) as a slave. A second function to process; And a program for realizing a third function for performing bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging function and MAC function according to the processing result of the second step. Provide a computer-readable recording medium for recording.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a passive optical branch network system to which the present invention is applied.

As shown in FIG. 1, the passive optical branch network system is composed of a broadband station apparatus (OLT) 11, an optical distribution network (ODN) 12, and an optical subscriber access unit (ONU) 13. As a result, up to 64 ONUs 13 within a 20 km radius are connected to one OLT 11 in a one-to-many fashion.

Therefore, the downlink optical signal transmitted from the OLT 11 to the subscriber side is branched at the splitter and transmitted to each ONU 13, and the uplink optical signal transmitted from the plurality of ONUs 13 to the network side is combined at the combiner and the OLT 11 is combined. Is passed on. The downlink signal from the OLT 11 to the ONU 13 is delivered to the broadcast. On the contrary, since the uplink signals transmitted by the ONUs 13 to the OLT 11 are shared by one strand of the optical cable in the OLT 11 section through the combiner, the uplink signal should adopt a multiple access scheme. In G.983.1, the time division scheme is used. Is recommended.                     

2 is a block diagram of an embodiment of a data processing apparatus for a transmission convergence layer function in a passive optical branch network according to the present invention.

As shown in FIG. 2, in the TC function device for the transmission convergence layer function in the passive optical branch network, the core unit 21 includes an external cell FIFO, a controller 214, a clock generator 22, and a line driver. It is connected to the unit 23 to perform the core function of the PON transmission. That is, the transmit and receive framers 212 and 217 in the core unit 21 are connected to the controller 214 and operate in the OLT and the ONU, respectively.

That is, after the transmission framer 212 on the OLT side multiplexes the cell transmitted from the internal cell FIFO 211 of the core 21 together with the PLOAM cell from the controller 214, PTS (Parallel To Serial) The transmission framer 212 on the ONU side receives the multiplexed cells from the internal cell FIFO 211 according to various grant information from the controller 214, and multiplexes them to the PTS 213. .

Meanwhile, the data from the line driver unit 23 is processed by the data recovery unit 215, and then sent to the STP (Serial To Parallel) 216, and the receiving framer 217 on the OLT side is provided by the controller 214. After receiving the information and performing functions such as error correction, the cell is transmitted to the internal cell FIFO 218, and the receiving framer 217 on the ONU side receives data from the STP 216 to perform functions such as error correction. After performing the operation, the cells are classified and placed in the corresponding FIFO so that the controller 214 can read necessary information.

The clock generator 22 provides the core 21 with a multi-phase clock (155.52 MHz) and a byte clock (19.44 MHz), which causes the core 21 to recover data from the signal flowing from the line driver 23. In addition, a clock is provided to the optical transceiver unit 24.

The line driver unit 23 receives the data signal transmitted from the core unit 21 and transmits the signal in the form required by the optical transceiver unit 24, and also performs the reverse function.

FIG. 3 is a diagram illustrating a detailed operation of a framer that performs a core function in the data processing apparatus of FIG. 2.

The frame structure of a passive optical branch network system is defined in G.983.1.

In a symmetric structure with a transmission rate of 155.52 Mbits / s, the downlink frame consists of 56 cells having a size of 53 bytes. PLOAM cells appear periodically in the positions of the first and twenty-ninth cells. In other cases, an ATM cell or an idle cell is delivered. The uplink frame consists of 53 cells of size 56 bytes. Each approved ONU can transmit PLOAM cells, ranging cells, minislots, or data cells, depending on the type of approval, and if no cells are in the FIFO even though the data cell is approved, the idle cell is dropped. To pass.

Hereinafter, a detailed operation process of the framer for performing core functions in the data processing apparatus of the present invention having the structure as described above will be described in detail.

In passive optical branch network systems, the OLT and ONU's TC functions are different. This is because the ONU's TC function is configured to be OLT dependent. To distinguish this, the OLT side will be referred to as a master and the ONU side as a slave, and each will be divided into a transmitter and a receiver.

First, referring to the operation of the TC-M transmitter 31, the MUX multiplexes the cells according to the frame and the PLOAM cell synchronization signal. The PLOAM cell generator receives various acknowledgment information from the PMR cell generator and message information from the internal microprocessor connection to make the PLOAM cell and provide it to the MUX. The BIP calculates the BIP for data that is half the frame length and inserts the result in the last octet of the next PLOAM cell. The downlink frame of ATM-PON is a cell-based hybridization scheme, which follows the algorithm defined in I.432.

According to this, unlike the SDH base, the header 4 bytes of the cell are also subject to mixing. For synchronization at the receiving end, the last byte of the header is excluded from the object of mixing. In addition, the eighth and seventh bits of the last byte of the header carry the synchronization information of the mixing. So far, the operations are all handled in parallel. Finally, the PTS converts the parallelized data into serial data before passing it to the line driver.

Next, referring to the operation process of the TC-S receiver 32, after the down frame signal configured by the OLT arrives in the ONU and is subjected to photoelectric conversion, the following operation occurs when the driver transmits a serial data signal to the core part. . First, the STP parallelizes the serial data, and the synchronization circuit performs a synchronization operation for cell division. This process also follows the algorithm described in I.432.1. Initially, bitwise header checking is performed in the "HUNT" state. In this case, if only the lower 6 bits match, the synchronization is considered to be matched and enters the "PRESYNC" state, since the descramble synchronization has not been achieved yet, so the exact value of the upper 2 bits cannot be calculated. . In the "PRESYNC" state, the check is performed on a cell-by-cell basis. If the header values match 8 consecutive times (DELTA = 8), the state is entered into the "SYNC" state. In this state, if a header error occurs 7 times consecutively (ALPHA = 7), the state is changed to "HUNT" again. As this synchronization state continues, PLOAM cell synchronization and frame synchronization are obtained. Demixing motivation is relatively complex. The demixing synchronization circuit has a confirmation counter to maintain each state. The lower limit of the counter is 0 and the upper limit is 24. If the cell header values match, then the value of the counter, C, increases; otherwise, the value decreases. When the initial acquisition state reaches "C = 16", the state transitions to the confirmation state. In this state, when the value decreases to "C = 8", the state returns to the acquisition state. When "C = 24" is reached in the confirmation state, the steady state is reached. In this state, decreasing to "C = 16" enters the acquisition state again. In this process, the back-mixing motivation is achieved.

At this time, if the demixing synchronization is not performed, the BIP process is impossible because the data value of the original cell cannot be recovered. Therefore, the BIP process is performed after the demixing synchronization is performed. Finally, the demultiplexer classifies the PLOAM cell, data cell and idle cell according to the value of the header and places them in the corresponding buffer. The alarm register records the cell sync error, PLOAM sync, and frame sync errors from the sync circuit. The PLOAM cell processor operates at the same time that the PLOAM cell is stored in the buffer, and processes the sync field, acknowledgment field, and message field. .

Next, looking at the operation of the TC-S transmitter 33, the uplink frame is composed of 53 timeslots having a length of 56 bytes. At this time, the time slot is configured according to the approval provided by the OLT. Thus, this timeslot may be a ranging cell, a PLOAM cell, a minislot, or a data cell.

As shown in FIG. 3, the TC-S transmitter 33 is different from the TC-M transmitter 31, which is a buffer in which PLOAM cells, ranging cells, mini slot cells, data cells, and idle cells are separated. Is stored in. These cells cannot be sent out at any time and are delivered to timeslots specified by the OLT's approval. This function is responsible for the approval handler to open the buffer at the designated time. The PMR (PLOAM, Minislot, Ranging) cell generator is largely responsible for generating PLOAM cells, ranging cells, and minislot cells. The MUX provides a multiplexing function so that corresponding cells are delivered according to the type of approval. The cell calculates the BIP through a HEC (Header Error Control) field generator. Once the BIP calculation is complete, the cell is mixed in the manner defined in G.983.1. In this process, the blending of the header 3 bytes is excluded, and the blending is performed only for 53-byte cells. Up to this stage, cells processed in parallel and mixed are converted to serial data and transmitted. A status register records and manages all status information related to ranging.

Finally, referring to the operation of the TC-M receiver 34, once the signal from the ONU reaches the OLT, data recovery is performed once. Since the optical transceiver operating in burst mode does not provide a clock, it uses a local 155.52MHz multi-phase CLK. The preamble values extracted by each of these clocks are compared with a preamble value embedded based on the system bit clock. The bit sync signal is generated when the value is matched, the byte sync occurs when the delimiter is matched, and cell division is made.

After bit and byte synchronization signals are generated, serial data is converted to parallel data and demixed. After demixing is performed, a BIP check is performed and header error detection and correction is performed. Only cells that have no errors or whose header values are corrected are demultiplexed to the corresponding FIFO according to the delimiter value. The upcell is conveyed by an authorization provided by the OLT itself, so that the OLT already knows what kind of data is sent by some ONU through the predictor. Therefore, the demultiplexing may be determined by the predictor, not the cell header information. As a result, the data cell is transferred to the ATM cell buffer, the idle cell is discarded, and the PLOAM cell, ranging cell and minislot cell are transferred to the PMR cell processor. The phase monitor checks whether the uplink cell that arrives coincides with the point of arrival intended by the OLT.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention includes a transmission convergence layer function module in the broadband station device (OLT) and a transmission convergence layer function module in the plurality of optical subscriber access devices (ONU), respectively, so that the broadband station device (OLT) side has a TC master function. The optical subscriber connection device has an effect of performing a TC slaver function.

In addition, the present invention is a functional device that provides a TC layer function including MAC (Middle Access Control) function and ranging function, which are core functions of a passive optical branch network system, Due to the incomplete, it is possible to prevent possible confusion during system development, and by implementing these important functions in the same functional module, there is an effect that can be easily installed in the implementation of passive optical branch network system.

Claims (9)

In the data processing apparatus for transmission convergence layer function in a passive optical branch network (PON), The broadband subscriber station (OLT), which is a station-side device, and the optical subscriber access unit (ONU), which is a plurality of subscriber-side devices connected to the broadband station device (OLT), are respectively provided. Performs a transmission convergence (TC) layer function including a ranging function and a medium access control (MAC) function as a master and the optical subscriber access device (ONU) as a slave. Transmit Convergence Layer which processes up / down frames, performs bit sync, burst sync (up-cell sync), frame alignment (frame sync), ranging and MAC functions, and recovers data from upstream incoming signals Function processing means; Converts a downlink frame from the transmission convergence layer function processing means and transmits it to another data processing apparatus through an optical transceiver unit, and converts an uplink frame from the other data processing apparatus introduced through the optical transceiver unit to convert the uplink frame. Signal conversion means for transmitting to the processing means; And Clock providing means for providing a multi-phase clock and a byte clock to said transmission convergence layer function processing means and said signal converting means Data processing apparatus for a transmission convergence layer function in a passive optical branch network comprising a. The method of claim 1, In the transmission convergence layer function processing means, The transmission framer of the broadband station device (OLT) multiplexes the cell transmitted from the outside with the PLOAM (Physical Layer Operation And Maintenance) cell from the controller and sends it to Parallel To Serial (PTS), and transmits the cell transmitted from the outside The transmitting framer of the ONU side receives the multiplexed cells from the internal cell FIFO according to the grant information from the controller, multiplexes them to the PTS, and transmits the data transmitted through the transfer means. After the data recovery unit processes the data to the STP (Serial To Parallel), the receiving framer of the broadband station apparatus receives the information provided by the controller and performs a function such as error correction, and then the cell is transferred to the internal cell FIFO. The receiving framer at the optical subscriber access device side receives the data from the STP and performs a function such as error correction. By separating the cell species was placed in the FIFO data processing device for the transmission convergence layer functions in manual splitting deceptive characterized in that to read the required information which the controller. In a data processing method for a transmission convergence layer function in a passive optical branch network (PON), And a transmission convergence (TC) layer functional module, respectively, in the broadband subscriber station (OLT), which is a station-side device, and in the optical subscriber access unit (ONU), which is a plurality of subscriber-side devices, connected to the broadband station device (OLT). Stage 1; The uplink and downlink frames for the transmit convergence (TC) layer function are formed by using the transmission convergence layer function module on the OLT side as a master and the transmission convergence layer function module on the optical subscriber access device (ONU) as a slave. A second step of processing; And A third step of performing bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging function and MAC function according to the processing result of the second step Data processing method for a transmission convergence layer function in a passive optical branch network comprising a. The method of claim 3, wherein The transmission convergence (TC) layer function module, The core part includes a core part, a clock generator, and a line driver part, and the core part is connected to an external cell FIFO, a controller, a clock generator, and a line driver part to perform core functions of the PON transmission. The clock generator provides a multi-phase clock (155.52 MHz) and a byte clock (19.44 MHz) at the core to cause the core to recover data from the signal flowing from the line driver, and an optical transceiver The transmission converging layer in the passive optical branch network, which provides a clock, and the line driver unit receives the data signal transmitted from the core unit, transmits the signal in the form required by the optical transceiver unit, and performs the reverse function. Data processing method for function. The method according to claim 3 or 4, The transmission convergence (TC) layer functional module of the broadband station device (OLT) side, The MUX (Multiplexer) allows the multiplexing of cells according to frames and physical layer operation and maintenance (PLOAM) cell synchronization signals, and the PLOAM cell generator provides various grant information and internal information from the PMR cell generator of the receiver. The message information from the microprocessor connection is input to make the PLOAM cell and provide it to the MUX.BIP (Bit Interleaved Parity) calculates the BIP for the data corresponding to half of the frame length, and then The result is inserted into the last octet, and the cell scrambler processes according to the algorithm defined in I.432 so that PTS (Parallel To Serial) converts the parallelized data into serial data before passing it to the line driver. A data processing method for a transmission convergence layer function in a passive optical branch network characterized in that. The method according to claim 3 or 4, The transmission convergence (TC) layer functional module of the broadband station device (OLT) side, In the receiver, once the signal sent by the ONU arrives, data recovery is performed, and a preamble value extracted by the clocks using a local 155.52 MHz multi-phase CLK and After comparing the built-in preamble value based on the system bit clock to match the bit synchronization, and after the delimiter is matched, the byte synchronization is performed. Converts serial data into parallel data to perform demixing, and after demixing, performs bit interleaved parity (BIP) checks, performs header error detection and correction, and detects cells in which there are no errors or header values corrected. Only demultiplexed to the corresponding FIFO according to the delimiter value, and the demultiplexed value is determined by the prediction of the predictor, and the data cell is the ATM cell buffer and the idle cell Is discarded and the PLOAM cell, ranging cell and minislot cell are delivered to the PMR cell processor, the phase monitor transmits in the passive optical network, characterized in that it checks whether the arriving upstream cell matches the intended arrival time of the OLT. Data processing method for convergence layer function. The method according to claim 3 or 4, The transmission convergence (TC) layer functional module on the optical subscriber access unit (ONU) side, After the down frame signal configured by the OLT arrives at the ONU and is subjected to photoelectric conversion, the STP (Serial To Parallel) parallelizes the serial data when the line driver transmits the serial data signal to the core part. The synchronization circuit performs synchronization for cell division to obtain PLOAM (Physical Layer Operation And Maintenance) cell synchronization and frame synchronization, demixes, and then performs the bit interleaved parity (BIP) process, and a demultiplexer (DEMUX). PLOAM cell, data cell and idle cell are classified and placed in the buffer according to the value of the header.Alarm register records cell synchronization error, PLOAM synchronization error and frame synchronization error information from the synchronization circuit. The PLOAM cell processor processes the sync field, grant field, and message field by generating a signal when the PLOAM cell is stored in the buffer. The contents of the acknowledgment field perform an error check so that the grant processor can read the grant processor, and the data processing method for the transmission convergence layer function in the passive optical branch network. The method according to claim 3 or 4, The transmission convergence (TC) layer functional module on the optical subscriber access unit (ONU) side, In the transmitting unit, PLOAM cells, ranging cells, minislot cells, data cells, idle cells, etc. are stored in separate buffers, and these cells cannot be sent at any time and are designated by the approval of the OLT. This function is transferred to the timeslot, and the approval processor takes care of this function and opens the corresponding buffer at the designated time. The PMR (PLOAM, Minislot, Ranging) cell generator is a PLOAM (Physical Layer Operation And Maintenance) cell, ranging cell, mini MUX provides a multiplexing function so that a corresponding cell is delivered according to the type of approval, and the cell calculates a bit interleaved parity (BIP) through a header error control (HEC) field generator. After that, a cell mixing process is performed, and the mixed cells are converted into serial data, and a status register registers and manages all status information related to ranging. Data processing method for transmission convergence layer function in network. In passive optical network with processor, And a transmission convergence (TC) layer functional module, respectively, in the broadband subscriber station (OLT), which is a station-side device, and in the optical subscriber access unit (ONU), which is a plurality of subscriber-side devices, connected to the broadband station device (OLT). 1 function; The uplink and downlink frames for the transmit convergence (TC) layer function are formed by using the transmission convergence layer function module on the OLT side as a master and the transmission convergence layer function module on the optical subscriber access device (ONU) as a slave. A second function to process; And A third function for performing bit synchronization, burst synchronization (uplink cell synchronization), frame alignment (frame synchronization), ranging and MAC functions according to the processing result of the second step A computer-readable recording medium having recorded thereon a program for realizing this.

Images