KR100403301B1 - MAC processing equipment applying to POD module of the open cable, method for operating the same and MAC processing method - Google Patents

Abstract

The present invention relates to a MAC processing apparatus of a POD module for digital cable broadcasting, a driving method thereof, and a MAC processing method. The MAC processing apparatus extracts MAC packets by analyzing MPEG-2 TS packet data received from a physical layer processing apparatus. An MPEG-2 TS processor; A Mac header parser that receives the MAC packets of the MPEG-2 TS processor, parses a header into separate interactive data and MAC messages, and outputs the interactive data to a cas module; A Mac message processor which receives Mac messages of the Mac header parser and processes various messages and generates a response signal; The Mac message processor receives and processes a Mac message that is processed and responds to, generates a process message and a response message for the Mac message, transmits the process message to the cas module, and sends the response message to the physical layer processor. It is composed.

Accordingly, the present invention enables the processing of MPEG-2 TS (Transport Stream) and various MAC messages such as control signals and encryption key transmissions transmitted from the headend during digital wired broadcasting, thereby facilitating smooth communication between the digital terminal and the headend. The effect is possible.

Description

MAC processing equipment applying to POD module of the open cable, method for operating the same and MAC processing method}

The present invention relates to a MAC (Media Access Control) processing apparatus of a Point of Deployment (POD) module for digital cable broadcasting, a driving method thereof, and a method of processing the MAC, and more particularly, in a digital cable broadcasting, MAC processing device of the POD module for digital cable broadcasting that can enable the processing of MPEG-2 TS (Transport Stream) and various Mac messages such as control signal and encryption key transmission transmitted from the head end; It relates to a driving method and a mac processing method thereof.

Recently, the open cable method of the US and the DVB-C method of Europe have been applied as international standards for digital cable broadcasting.

In particular, U.S. open cable broadcasting was studied by Cable Labs Inc., which uses QAM for modulation, MPEG2 for video compression and multiplexing, and Dolby AC-3 for audio compression. The Security Module Interface (POD) uses a Point of Deployment (POD) interface.

In the digital cable broadcasting, subscribers can perform two-way transmission / reception such as broadcasting, text transmission, service communication, and authentication between a broadcasting station, which is a head end, and a subscriber's digital terminal (that is, a set-top box). It is possible to conveniently use contents such as entertainment, information and home shopping of digital cable broadcasting in real time.

Therefore, such digital cable broadcasting has general specifications for two-way communication between broadcasting stations and digital terminals, but is matched with broadcasting systems in each country, and digital terminals and subordinate POD modules and MAC processing methods in order to provide improved services. And back.

However, since the broadcasting method or the content protection method are different according to the types and operators of the digital cable broadcasting, different receivers need to be used for each broadcaster, and thus there are many inconveniences for the receiver manufacturer and the general subscriber.

The present invention is proposed for smooth communication between the headend and the digital terminal during digital wired broadcasting, and includes MPEG-2 TS (Transport stream) such as transmission of control signals and encryption keys in out-of-band (OOB). The purpose of the present invention is to provide a MAC processing device of the POD module for digital cable broadcasting designed to process various Mac messages.

Another object of the present invention is to provide a method of driving a Mac processing apparatus for smooth communication with a headend using a MAC processing apparatus of a POD module in a subscriber's digital terminal for digital cable broadcasting.

It is another object of the present invention to provide a Mac processing method for processing Mac messages in communication with digital terminals.

In order to achieve the above object, the MAC processing apparatus of the POD module for digital cable broadcasting includes: an MPEG-2 TS processor configured to extract MPEG packets by analyzing MPEG-2 TS packet data received from a physical layer processing apparatus;

The MAC packets of the MPEG-2 TS processor are received, the headers are analyzed, separated into interactive data and MAC messages, and the interactive data is output to a CAS (conditional access system) module. An outputting MAC header parser;

A MAC message processor which receives MAC messages of the MAC header parser and processes various messages and generates response signals;

The Mac message processor receives the Mac message processed and responded to by the Mac message processor, generates a process message and a response message for the Mac message, transmits the process message to the cas module, and transmits the response message to the physical layer processing device. MAC Message Generator).

In addition, the method of driving the MAC processing apparatus of the POD module for digital cable broadcasting to achieve another object of the present invention is to receive and analyze the MPEG-2 TS packet data transmitted from the physical layer processing apparatus in the MPEG-2 TS processor Extracting Mac packages, Program Specific Information (PSI) section data, and Entitlement Management Message (EMM) Session Key;

Sending the PSI section data and the EMM session key to a cas module and sending a Mac package to a Mac header parser;

Analyzing the header of the Mac package in the Mac header parser and separating the extracted data into interactive data and Mac messages;

Sending the interactive data to a cas module and sending the Mac messages to a Mac message processor;

Generating signals for processing and responding to various messages of the Mac message processor;

Receiving a Mac message processed and responded to by the Mac message processor by a Mac message generator and generating a process message and a response message for the Mac message;

The process message is transmitted to the cas module, the response message is characterized in that the step of transmitting to the physical layer processing apparatus.

In addition, a mac processing method for achieving another object of the present invention comprises the steps of: powering a digital terminal and starting operation;

Receiving and setting a DC (Default Configuration) message including a default parameter and configuration information from a headend which is a broadcasting station;

Receiving and setting a Content Channel Channel List (CCL) message that sets a list of channels to be used for data transmission and a backoff parameter to be used in Aloha from the headend;

Receiving a Sign-On Request (SOREQ) message from the headend and responding with a Sign-On Response (SORES) message;

Receiving a Logical Address (LA) message with various addresses for the digital terminal to set from the headend and responding with a Link Management Message (LMR) message that the LA message was well received;

The TC operates as a Slotted Aloha, sends an idle message to the headend to receive and process an ACK (Acknowledge) message, and the TC controls the upsteam transmission to the headend. Receiving a Transmission Control message, processing a TC message, and responding with an LMR message, wherein the digital terminal transitions to an idle state.

1 is a block diagram of a system for digital wired broadcasting of the present invention.

2 is a block diagram of a vein processing apparatus according to a first embodiment of the present invention.

3 is a block diagram of a pulse processing apparatus according to a second embodiment of the present invention.

4 is a block diagram of a pulse processing apparatus according to a third embodiment of the present invention.

Fig. 5 is a flowchart showing Mac processing for driving the digital terminal of the present invention.

FIG. 6 is a flowchart showing the mac processing after the mac processing of FIG. 5.

<Description of the symbols for the main parts of the drawings>

100: head end 200: physical layer processing apparatus

300: Mac processing unit interface 400, 401, 402: Mac processing unit

410: MPEG-2 TS Processor 411: Mac Buffer

412: Mac Reassembly 420: Mac Header Python

421 CRT checker 430 message removal and error reporting means

450: Mac Message Processor 470: Mac Message Generator

481 First buffer 482 First packager

483: separator 484: multiplexer

485: second buffer 486: Mac header

487: Second Packetizer 488: Header and Taylor Generator

500: Cas interface 600: Cas module

700: digital terminal

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a system for digital wired broadcasting according to the present invention, in which a digital broadcast signal transmitted to a headend 100, which is a digital broadcast station, and a response message signal transmitted from the digital terminal 700 to the headend 100. A physical layer processing apparatus 200 for physically processing the out-of-band; A mac processing apparatus 400 for receiving and processing the physically processed broadcast signal of the physical layer processing apparatus 200, generating a response message of the digital terminal 700, and separating interactive data; A cas module 600 for descrambling the interactive data; The digital module 700 is configured to receive the descrambled data from the cas module 600 so that the digital cable broadcasting subscriber can interactively communicate with the headend 100 for the additional service.

There is a pulse processing apparatus interface 300 between the physical layer processing apparatus 200 and the pulse processing apparatus 400, and a casing interface 500 exists between the pulse processing apparatus 400 and the casing module 600. To interface.

The physical layer processing apparatus 200, the pulse processing apparatus 400, and the casing module 600 are components of the POD module 800 of OpenCable, which is a digital cable TV standard.

2 is a block diagram of a MAC processing apparatus according to a first embodiment of the present invention, in which the MAC processing apparatus 400 of the first embodiment receives an MPEG-2 TS received from the physical layer processing apparatus through the MAC processing interface 300. An MPEG-2 TS processor 410 for analyzing packet data and extracting MAC packets; A Mac header parser 420 that receives the MAC packets of the MPEG-2 TS processor 410, analyzes a header, separates the data into interactive data and MAC messages, and outputs the interactive data to a cas module; A Mac message processor 450 that receives the MAC messages of the MAC header parser 420 and generates a signal for processing and responding to various messages; The MAC message processor 450 receives a signal processed and responded to, generates a process message and a response message for the MAC message, transmits the process message to the cas module through the cas interface 500, and the response message is a physical layer. Mac message generator 470 for transmitting to the processing unit.

3 is a block diagram of a pulse processing apparatus according to a second embodiment of the present invention, wherein the pulse processing apparatus 401 of the second embodiment of the present invention is constructed from a casing module according to the first embodiment of the present invention shown in FIG. A first buffer 481 which receives and stores data information sent to the headend; A header and taylor generator 488 for receiving data information sent from the cas module to the headend and generating a header and a taylor of the data information; A first packetizer 482 for receiving the stored data information of the first buffer 481, the header and the taylor, and attaching and packaging the header and the taylor to the data information; A segmentation equipment 483 for generating the packaged data of the first packager 482 into a plurality of cell types separated by specific bytes; A second buffer (485) for storing data separated into a plurality of cells of the separator (483); A MAC header 486 for generating a header upon receiving input of data separated into a plurality of cells of the second buffer 485; A second packeter outputting the data separated into a plurality of cells of the separator 483 and the header of the MAC header 486 to the physical layer processing apparatus through the MAC processing interface 500 for transmission to the headend. There are further components composed of an earer 487.

FIG. 4 is a block diagram of a MAC processing apparatus according to a third embodiment of the present invention. The third embodiment of the present invention provides MPEG-2 TS packet data received through the MAC processing interface 300 from a physical layer processing apparatus. An MPEG-2 TS processor 410 for analyzing and extracting MAC packets, PSI section data and an EMM session key; A Mac buffer 411 for receiving and storing MAC packets extracted by the MPEG-2 TS processor 410; A MAC re-assembly (412) for packaging Mac packets into Mac packets stored in the Mac buffer (411); The MAC packet received by the Mac reassembly 412 is input, the header is analyzed, separated into interactive data and MAC messages, and outputted. The interactive data is parsed by a MAC module through a cas interface 500. 420; A CRC checker 421 that receives interactive data and MAC messages of the MAC header parser 420 and performs a CRC error check; Message removal and error reporting means (430) for removing faulty interactive data and MAC messages in the CRC checker (421) and reporting an error; A MAC message processor 450 for receiving an error-free MAC message from the CRC checker 421 and generating a signal for processing and responding to various messages; The Mac message processor 450 receives a signal processed and responded to, generates a process message and a response message for the Mac message, transmits the process message to the cas module, and sends a response message to the physical layer processing apparatus. A generator 470; A first buffer 481 for receiving and storing data information sent from the cas module to the headend; A header and taylor generator 488 for receiving data information sent from the cas module to the headend and generating a header and a taylor of the data information; A first packager 482 which receives the stored data information of the first buffer 481 and the header and the taylor, and attaches and packages the header and the taylor to the data information; A separator 483 for generating the packaged data of the first packager 482 into a plurality of cell types separated by 48 bytes; A second buffer (485) for storing data separated into a plurality of cells of the separator (483); A MAC header 486 for generating a header by receiving data input into a plurality of cells of the second buffer 485; A second packager (487) for packaging data separated into a plurality of cells of the separator (483) and a header of the MAC header and outputting the package to a physical layer processing apparatus for transmission to the headend; The multiplexer 484 receives a response message of the MAC message generator 470 and data in a cell form divided into 48 bytes of the separator 483 and selectively outputs the data to the second buffer 485. .

The MAC processing apparatus of the present invention configured as described above receives the MPEG-2 TS packet data transmitted from the physical layer processing apparatus through the MAC processing interface 300 from the MPEG-2 TS processor and analyzes the MAC packet by referring to the packet ID. Extract the PSI section data and the EMM session key: transfer the PSI section data and the EMM session key to the cas module via the cas interface 500, store the Mac packet in the Macbuffer 411, and then store the stored Mac packet The packets are packaged in the Mac reassembly 412, and the packaged Mac packets are transmitted to the Mac header parser 411.

Analyzing the header of the Mac packet packaged by the Mac header parser (420), extracting the extracted data into interactive data and Mac messages, and checking the CRC error in the CRC checker (421); Eliminate faulty interactive data and Mac messages, report errors, and send error-free interactive data to the cas module through the cas interface 500, and send faultless Mac messages to the Mac message processor 450. do.

The Mac message processor 450 processes various messages and generates response signals, receives the response and processing signals from the Mac message processor 450 from the Mac message generator 470, and processes the messages for the Mac messages. Generate a response message.

The processing message for the MAC message is transmitted to the CAS module through the CAS interface 500, and the response message is transmitted to the physical layer processing apparatus through the MAC processing interface 300.

Receives data information sent from the casing module to the headhand through the cas interface 500 and stores it in the first buffer 481, and receives data information sent from the casing module to the headhand, and generates a header and taylor generator. In 488, a header and a taylor of the data information are generated.

The data information stored in the first buffer, the header and the taylor are packaged in the first packager 482, and the data packaged in the first packager 482 is separated into 48 bytes in the separator 483. A plurality of cell types of data are generated.

The response message of the MAC message generator 470 and the data of a plurality of cells of the separator 483 are selectively stored in the second buffer in the multiplexer 484.

In addition, the response message or data of a plurality of cell types selected by the multiplexer 484 are stored in the second buffer 485 and selected among data or response messages divided into a plurality of cells of the second buffer 485. The header is generated from the MAC header 486 and the header generated from the MAC header 486 is selected from among the data divided into a plurality of cells or the response message of the second buffer 485. In operation 487, the package is output to the physical layer processing apparatus through the MAC processing interface 300 for transmission to the headend.

FIG. 5 is a flowchart showing a Mac process for driving a digital terminal of the present invention. When power is supplied to the digital terminal and the operation starts (step 1), the system itself is checked (step 2), and the normal operation is determined. At this time, if it operates normally, it waits for receiving a DC (Default Configuration) message from the headend which is a broadcasting station (step 5). If the system does not operate normally, the warning display and error of the error are displayed (step 4).

This DC message is sent from the headend to the digital terminal and contains the default parameters and configuration information.

When the digital terminal receives the DC message, it sets a DC message that sets the basic parameters of the MAC (step 7). These basic parameters of the MAC are the parameters that the digital terminal will use for subsequent sign-on and transmit power. These are the values required to configure the scope of the range, the channel to be used for sign-on, the backup service channel, the idle timer, and the initial abort timer.

Digital terminals that have set up a DC message, which is a parameter setting using a DC message, switch their status to the MAC Content Channel List (CCL) and have a waiting time waiting for the CCL (Step 8).

The CCL (Contention Channel List) message is a message sent from the headend to the terminals. The CCL message receives the CCL message, and the CCL sets the list of channels used for data transmission and the backoff parameter used for the ALOHA MAC Set the message (Step 10)

After receiving the CCL message, the digital terminal waits to receive a SOREQ (Sign-On Request) message from the headend. (Step 11) The SOREQ message specifies the upstream frequency that the terminal will use when the digital terminal requests to enter the network. Include. When the SOREQ message is sent from the headend, the digital terminal sends a SORES (Sign-On Response) message to the headend in response (Step 14).

At this time, if several terminals transmit SORES message at the same time, a collision occurs. To prevent this, the terminal waits. Each digital terminal waits for a random amount of time before sending a SORES message, which reduces the probability of collision by distributing the SORES message.

The SOREQ message is the message requested by the headend to allow the digital terminal to attempt to enter the network, and the SORES message is the response of the SOREQ message sent by the digital terminal to the headend.

When SOREQ is received while waiting for SOREQ (Step 11), it is checked whether the timer (A) time for initializing the digital terminal has expired (Step 12). ), Wait for the CCL again, and if it does not expire, check the SOREQ message (Step 13), and process and respond to the SOREQ message (Step 14).

The digital terminal sends a SORES message and then waits for a Logical Address (LA) message from the headend with various addresses for the digital terminal to set (Step 15).

After waiting for the LA message, check whether the timer (A) time for the initialization setting of the digital terminal has expired (Step 16) .If the timer (A) has expired, check the basic parameters of the MAC. Reset the DC message you are setting (step 17).

When the LA message is received because the timer A has not expired, the digital terminal sets the addresses used by the digital terminal through the LA message, and the LMR (Link Management Response) message that the LA message is well received is received. (Step 18)

On the other hand, after the state of waiting for the LA message starts, it is checked whether the time of the timer C has expired (Step 19). If the timer C has expired, the SORES message is retransmitted, and the timer C If it has not expired, wait for LA again. When the process up to this point is completed, the digital terminal has completed the initialization setting in a state where the handend can be interactively communicated with the handend.

FIG. 6 is a flowchart illustrating the processing of the processing after processing of the processing of FIG. 5, wherein the digital terminal sets addresses to be used by the digital terminal and transmits an LMR (Link Management Response) message to the headend indicating that the LA message is well received. The digital terminal ends the basic configuration, becomes a state in which data can be transmitted and received in an Aloha manner, and switches to an idle state for providing a service to a higher layer (step 21). The terminal operates as a slotted aloha, initiates transmission when there is data to be sent to the headend, checks if the timer (B) has expired (step 22), and transmits a TC value of 1 Check whether the message and the SREQ (Status Request) message are received from the headend (steps 42 and 43).

In the idle state, the digital terminal first checks whether timer B has expired (step 22), and if so, the digital terminal transmits an idle message to the headend and waits for an ACK message again (step 23). ).

After the idle message is sent to the headend, the digital terminal enters into a waiting state for an acknowledgment message (step 24). If the timer C has expired, the idle message is resent and the ACK message is sent. (Step 28) The ACK message further includes a PA (Power Adjust) message for adjusting the power of the digital terminal from the headend.

If the timer C has not expired and receives an ACK / PA (Power Adjust) message and the ACK is 0 in the ACK / PA message, the ACK / PA message is processed and the digital terminal returns to the idle state. 26, 27)

After waiting for an ACK message, the digital terminal checks the reception of the SREQ (Status Request) message sent from the headend to obtain information about the connection status and error status between the headend and the digital terminal (step 29). If so, process the SREQ message and respond to the headend (step 30).

Check whether the timer B has expired (step 22), if not, confirm whether to send interactive data (step 31), send interactive data (step 32), and wait for an ACK message (step 24). Switch to).

In the idle state (step 21), the digital terminal secondly checks the reception of a TC (1) (Transmission Control) message having a value of 1 from the headend (step 33), and if so, the TC (1) message. Process, send a Link Management Response (LMR) message to the headend (step 34), which is a response message to the reception (step 34), and the digital terminal stops all transmissions; And suspend to check whether the SREQ message has been received (step 35).

These TC messages are used to control upstream transmission to the headend of the digital terminal. When the upstream transmission is stopped by the TC message, the digital terminal is in a suspended state, and no packet is transmitted except the link management message sent in response to the status response message and the transmission control message.

If the SOREQ message is checked and received in the suspended state, the SOREQ message is processed, responded to the headend (steps 36 and 37), and the process returns to the state of waiting for LA (step 15).

In the suspend state, the TC (0) message is checked and received, the TC (0) message is processed, and the response is sent to the headend (steps 38 and 39). In response, the headend performs a SRES (Status Response) response (steps 40 and 41), and then enters an idle state (step 21).

In the idle state (step 21), the digital terminal third checks whether a SREQ message has been received from the headend (step 42), processes the SREQ message, and responds to the headend.

As described above, the present invention extracts and processes various Mac messages, interactive data, PSI section data, and EMM session key included in the MPEG-2 TS transmitted from the headend, thereby interactively between the digital terminal and the headend. You will be able to communicate smoothly.

In the present invention, it is possible to facilitate the communication between the digital terminal and the headend by enabling the processing of MPEG-2 TS (Transport Stream) and various Mac messages such as control signals and encryption key transmissions transmitted from the headend during digital cable broadcasting. That effect occurs.

Although the present invention has been described in detail only with respect to specific examples above, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the present invention, and such modifications and modifications belong to the appended claims.

Claims (12)

An MPEG-2 TS processor for analyzing MAC-2 TS packet data received from the physical layer processing apparatus and extracting MAC packets; A Mac header parser that receives the MAC packets of the MPEG-2 TS processor, parses a header into separate interactive data and MAC messages, and outputs the interactive data to a cas module; A Mac message processor which receives Mac messages of the Mac header parser and processes various messages and generates a response signal; The Mac message processor receives and processes a Mac message that is processed and responds to, generates a process message and a response message for the Mac message, transmits the process message to the cas module, and sends the response message to the physical layer processor. Mac processing apparatus of the POD module for digital cable broadcasting, characterized in that configured. According to claim 1, The pulse processing apparatus, A first buffer for receiving and storing data information sent from the cas module to the headend; A header and taylor generator which receives data information sent from the cas module to the headend and generates a header and a taylor of the data information; A first packager configured to receive the stored data information of the first buffer, the header and the taylor, and attach and package the header and the taylor to the data information; A separator for generating the packaged data of the first packager into a plurality of cells separated by specific bytes; A second buffer for storing data separated into a plurality of cells of the separator; A MAC header configured to generate a header by receiving input of data separated into a plurality of cells of the second buffer; And a second packager for packaging the data separated into a plurality of cells of the separator and the header of the MAC header and outputting the header to the physical layer processing apparatus for transmission to the headend. Audio module Mac processor. The method of claim 2, Particular byte of the separator is a MAC processing apparatus of the POD module for digital cable broadcasting, characterized in that 48 bytes. An MPEG-2 TS processor which analyzes MPEG-2 TS packet data received from the physical layer processing apparatus and extracts MAC packets, PSI section data and an EMM session key; A Mac buffer for receiving and storing Mac packets extracted from the MPEG-2 TS processor; A Mac reassembly for packaging Mac packets stored in the Mac buffer; A Mac header parser which receives the packaged Mac packet of the Mac reassembly, separates the header into interactive data and Mac messages, and outputs the interactive data to the cas module; A CRC checker for receiving a CRC error check by receiving interactive data and MAC messages of the Mac header parser; Message removal and error reporting means for removing erroneous interactive data and MAC messages and reporting an error in the CRC checker; A Mac message processor for receiving an error-free Mac message from the CRC checker and generating a signal for processing and responding to various messages; The Mac message processor receives a signal processed and responded to, generates a process message and a response message for the Mac message, transmits the process message to the cas module, and the response message includes a MAC message generator for transmitting to the physical layer processing apparatus. Mac processing apparatus of the POD module for digital cable broadcasting, characterized in that. The method of claim 4, wherein the pulse processing apparatus, A first buffer for receiving and storing data information sent from the cas module to the headend; A header and taylor generator which receives data information sent from the cas module to the headend and generates a header and a taylor of the data information; A first packager configured to receive the stored data information of the first buffer, the header and the taylor, and attach and package the header and the taylor to the data information; A separator for generating the packaged data of the first packager into a plurality of cell types separated by 48 bytes; A second buffer for storing data separated into a plurality of cells of the separator; A MAC header configured to generate a header by receiving input of data separated into a plurality of cells of the second buffer; And a second packager for packaging the data separated into a plurality of cells of the separator and the header of the MAC header and outputting the header to the physical layer processing apparatus for transmission to the headend. Audio module Mac processor. The method according to claim 4 or 5, And a multiplexer for receiving the response message of the MAC message generator and data in a cell form divided into 48 bytes of the separator and selectively outputting the data to the second buffer. Mac processor. Receiving the MPEG-2 TS packet data transmitted from the physical layer processing apparatus from an MPEG-2 TS processor and analyzing the extracted MPEG packages to extract Mac packages, PSI section data, and EMM session key; Sending the PSI section data and the EMM session key to a cas module and sending a Mac package to a Mac header parser; Analyzing the header of the Mac package in the Mac header parser and separating the extracted data into interactive data and Mac messages; Sending the interactive data to a cas module and sending the Mac messages to a Mac message processor; Generating signals for processing and responding to various messages of the Mac message processor; Receiving a Mac message processed and responded to by the Mac message processor by a Mac message generator and generating a process message and a response message for the Mac message; The process message is sent to the cas module, the response message is a method of driving a MAC processing apparatus of the POD module for digital cable broadcasting, characterized in that configured to transmit to the physical layer processing device. The method of claim 7, wherein Parsing the header of the Mac package in the Mac header parser to extract and extract the interactive data and the Mac messages, transmitting the interactive data to the cas module, and transmitting the Mac messages to the Mac message processor. on, Checking the interactive data and MAC message in a CRC checker for a CRC error; Remove erroneous interactive data and Mac messages and report errors; Error free interactive data is sent to the cas module; Method of driving a Mac processing device of the POD module for digital cable broadcasting, characterized in that the error-free Mac package is transmitted to the Mac message processor. The method according to claim 7 or 8, Receiving data information sent from the cas module to the headend and storing the data information in a first buffer; Receiving data information sent from the cas module to the headend and generating a header and a taylor of the data information in a header and taylor generator; Packaging the stored data information of the buffer, the header and the taylor in a packager; Generating the packaged data of the packager in the form of a plurality of cells separated by 48 bytes in a separator; Storing the response message and the data of the plurality of cell types selectively in a second buffer in a multiplexer; Generating a header by receiving, from a Mac header, a selected one of data divided into a plurality of cells of the second buffer or a response message; The method may further include outputting the header of the MAC header from a plurality of data divided into a plurality of cells of the second buffer or a response message, and outputting the header of the MAC header to a physical layer processor to transmit the header to the headend. Method of driving a Mac processing apparatus of the POD module for digital cable broadcasting. Supplying power to the digital terminal and starting operation; Receiving and setting a DC message including default parameters and configuration information from a headend which is a broadcast station; Receiving and setting a CCL message that sets a list of channels to be used for data transmission from the headend and a backoff parameter to be used in Aroha; Receiving a SOREQ message from the headend and responding with a SORES message; Receiving from the headend a LA message with various addresses for the digital terminal to set and responding with an LMR message that the LA message was well received; The digital terminal operates as a throated Aroha, sends an idle message to the headend to receive and process an ACK message, and the digital terminal receives a TC message to control upstream transmission to the headend to process the TC message and to LMR. Mac processing method, characterized in that configured to switch to a digital terminal in response to the message idle state. The method of claim 10, The TC message of the transition to the idle state is a value of 1, the value is a TC (1) message, received and processed by the TC (1) message, and the digital terminal is in a suspended state where upstream transmission to the headend is stopped. And switch to, and return to the state of receiving the LA message receiving a SOREQ message requesting the release of the idle state from the headend. The method of claim 10, The ACK message further comprises a PA message for adjusting the power of the digital terminal from the head end.