KR20020096305A - Method for communicating in set-top box with cable modem - Google Patents

Method for communicating in set-top box with cable modem Download PDF

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Publication number
KR20020096305A
KR20020096305A KR1020010034697A KR20010034697A KR20020096305A KR 20020096305 A KR20020096305 A KR 20020096305A KR 1020010034697 A KR1020010034697 A KR 1020010034697A KR 20010034697 A KR20010034697 A KR 20010034697A KR 20020096305 A KR20020096305 A KR 20020096305A
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South Korea
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top box
head
application
connection
communication
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KR1020010034697A
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Korean (ko)
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KR100392630B1 (en
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백현욱
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삼성전자 주식회사
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Priority to KR10-2001-0034697A priority Critical patent/KR100392630B1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6402—Address allocation for clients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE: A method for communicating at a set-top box having a cable modem within the same is provided to reduce a communication application, thereby providing faster executing speed. CONSTITUTION: A method for communicating at a set-top box having a cable modem within the same includes the steps of connecting the set-top box with a head-end at a physical layer and an MAC(Media Access Control) layer in an initial operation of the set-top box(201-202), maintaining the connection by receiving and transmitting messages at regular periods while an application is not executed(203), setting up an address of the set-top box by a DHCP process in executing the communication application within the set-top box(204), transmitting and receiving data at the address through a communication channel connected between the head-end and the set-top box(205), and terminating only the application without releasing the connection the head-end and the set-top box(206-207).

Description

케이블모뎀 내장형 셋탑박스에서의 통신 방법{METHOD FOR COMMUNICATING IN SET-TOP BOX WITH CABLE MODEM}TECHNICAL FOR COMMUNICATING IN SET-TOP BOX WITH CABLE MODEM

본 발명은 케이블모뎀 내장형 셋탑박스에서의 통신 방법에 관한 것으로, 셋탑박스의 초기동작시 어플리케이션의 실행여부와 관계없이 헤드-엔드(Head-end)와 맥(MAC) 계층의 연결을 항시 유지하도록 하여 어플리케이션 수행시간을 단축하고자 한 케이블모뎀 내장형 셋탑박스에서의 통신 방법에 관한 것이다.The present invention relates to a communication method in a set-top box with a built-in cable modem, and always maintains a connection between a head-end and a MAC layer regardless of whether an application is executed during initial operation of the set-top box. The present invention relates to a communication method in a cable modem built-in set-top box for reducing application execution time.

일반적으로, 디지탈 위성방송 수신기와 같은 셋탑박스(set-top-box)는 케이블모뎀을 내장하여, 방송서비스의 제공자측과 쌍방향통신이 가능하도록 되어있으며, 상기 쌍방향통신을 통해서 다양한 서비스를 제공하고 있다.In general, a set-top-box such as a digital satellite broadcasting receiver has a built-in cable modem to enable two-way communication with a provider of a broadcast service, and provides various services through the two-way communication. .

예를 들어, 케이블모뎀을 내장한 디지탈 위성방송 수신기는 도 1에 도시한 바와 같이, 위성신호 수신용 안테나(도시생략) 및 옥외에 설치된 저잡음주파수변환기로부터 입력된 위성신호(47~862MHz)를 입력받아 디지탈데이타를 출력시키는 프론트-엔드부(100)와, 상기 프론트엔드부(100)에서 출력되는 디지탈데이타중 시청자가 선택한 트랜스포트스트림의 비디오/오디오데이타를 추출하는 디먹스(101)와, 상기 디먹스(101)로부터 출력된 비디오/오디오데이타를 MEPG방식으로 디코딩하여 원래의 비디오신호를 만드는 MPEG디코더(102)와, 상기 MPEG디코더(102)에서 처리되는 비디오데이타를 저장하는 비디오RAM(103)과, 상기 MPEG디코더(102)로부터 출력되는 비디오데이타를 아날로그비디오신호로 변환하는 비디오엔코더(105)와, 상기 MPEG디코더(102)로부터 출력된 오디오데이타를 복원하는 오디오처리부(106)와, 상기 오디오처리부(106)로부터 출력된 오디오데이타를 아날로그신호로 변환하는 DAC(107)와, 상기 비디오엔코더(105) 및 DAC(107)의 오디오/비디오신호를 출력하는 AV회로부(108)와, 스마트카드의 데이타판독 및 처리를 제어하여 상기 CPU(104)로 제공하는 스마트카드제어기(110)와, 스마트카드 판독 수단인 카드홀더(111)와, 외부와의 양방향통신을 위한 통신인터페이스인 RS-232모듈(112)을 구비한다.For example, a digital satellite broadcasting receiver having a built-in cable modem inputs a satellite signal (47-862 MHz) input from an antenna for receiving a satellite signal (not shown) and a low noise frequency converter installed outdoors. A front-end unit 100 for receiving digital output data, a demux 101 for extracting video / audio data of a transport stream selected by a viewer among digital data output from the front end unit 100, and The MPEG decoder 102 which decodes the video / audio data output from the demux 101 by the MEPG method to produce the original video signal, and the video RAM 103 which stores the video data processed by the MPEG decoder 102. And a video encoder 105 for converting video data output from the MPEG decoder 102 into an analog video signal, and audio data output from the MPEG decoder 102. The audio processing unit 106 for restoring the data, the DAC 107 for converting the audio data output from the audio processing unit 106 into analog signals, and the audio / video signals of the video encoder 105 and the DAC 107. The AV circuit unit 108 for outputting, the smart card controller 110 for controlling the data reading and processing of the smart card and providing it to the CPU 104, the card holder 111 serving as a smart card reading means, and the outside. RS-232 module 112 is a communication interface for bidirectional communication.

상기 RS-232모듈(112)은 네트워크와 연결된 케이블모데과 연결되어, 네트워크를 통해 헤드-엔드(방송국)와의 양방향통신을 가능하게 한다.The RS-232 module 112 is connected to a cable modem connected to the network, thereby enabling bidirectional communication with the head-end (broadcasting station) through the network.

그외, 플래쉬메모리(113)와, USB(114)와, CPU램(115)와, IEEE1284(116)와, NVRAM(117)과, 프론트패널(118)이 더 구비된다.In addition, a flash memory 113, a USB 114, a CPU RAM 115, an IEEE1284 116, an NVRAM 117, and a front panel 118 are further provided.

그런데, 지금까지는 셋탑박스와 헤드-엔드간의 통신이, 셋탑박스의 통신과 관련된 어플리케이션(케이블모뎀용 어플리케이션)이 실행될 때, 셋탑박스의 물리(physical)계층과 맥(MAC)계층에서 헤드-엔드와의 연결(connection)이 이루어지고, 이때 할당받은 슬롯을 이용하여 어플리케이션 데이타의 송수신이 이루어지도록 되어 있다. 그 다음, 어플리케이션이 종료되면, 물리계층과 MAC계층의 연결(connection)이 해제되었다.However, until now, the communication between the set-top box and the head-end, when the application related to the communication of the set-top box (application for the cable modem) is executed, the head-end and the head-end at the physical layer and the MAC layer of the set-top box Connection is established, and application data is transmitted and received using the allocated slot. Then, when the application is terminated, the connection between the physical layer and the MAC layer is released.

따라서, 어플리케이션의 실행시간에 물리계층 및 MAC계층의 연결에 필요한 시간이 포함됨으로서, 동작시간이 느려진다는 문제점이 있다.Therefore, since the time required for the connection between the physical layer and the MAC layer is included in the execution time of the application, there is a problem that the operation time is slow.

본 발명은 상술한 종래의 문제점을 해결하기 위하여 제안된 것으로서, 그 목적은 셋탑박스의 초기동작시 어플리케이션의 실행여부와 관계없이 헤드-엔드(Head-end)와 맥(MAC) 계층의 연결을 항시 유지하도록 하여 어플리케이션 수행시간을 단축하고자 한 케이블모뎀 내장형 셋탑박스에서의 통신 방법을 제공하는데 있다.The present invention has been proposed to solve the above-mentioned conventional problems, and its object is to always connect the head-end and the MAC layer regardless of whether the application is executed during the initial operation of the set-top box. The present invention provides a communication method in a cable modem built-in set-top box which is intended to shorten application execution time by maintaining it.

도 1은 케이블모뎀을 내장한 디지탈위성방송수신기의 전체 구성을 보인 블럭도이다.1 is a block diagram showing the overall configuration of a digital satellite broadcast receiver with a built-in cable modem.

도 2는 셋탑박스와 헤드-엔드(H/E)간의 채널 연결을 위한 신호처리과정을 보인 도면이다.2 is a diagram illustrating a signal processing process for channel connection between a set-top box and a head-end (H / E).

도 3은 본 발명에 따른 통신 방법의 실시예를 보이는 도면이다.3 is a view showing an embodiment of a communication method according to the present invention.

본 발명은 상술한 목적을 달성하기 위한 구성수단으로서, 케이블모뎀 내장형 셋탑박스에서의 통신 방법에 있어서,The present invention as a configuration means for achieving the above object, in the communication method in a built-in cable modem built-in box,

(가) 셋탑박스의 초기동작시 헤드-엔드와 물리계층 및 MAC계층에서 연결을 실시하는 단계;(A) performing the connection at the head-end, the physical layer and the MAC layer during the initial operation of the set-top box;

(나) 헤드-엔드와 셋탑박스간에 연결이 이루어지면, 어플리케이션이 수행되지 않는 동안, 일정 주기로 메시지를 송수신하여 연결을 유지시키는 단계;(B) if a connection is made between the head-end and the set-top box, while the application is not performed, sending and receiving a message at regular intervals to maintain the connection;

(다) 셋탑박스내의 통신어플리케이션 실행시, DHCP처리에 의해 셋탑박스의 주소를 설정하는 단계;(C) setting the address of the set-top box by DHCP processing when executing the communication application in the set-top box;

(라) 상기 헤드-엔드와 셋탑박스간에 연결된 통신채널을 통해 상기 (다)단계에서 설정된 주소로 데이타를 송수신하는 단계; 및(D) transmitting and receiving data to the address set in step (c) through a communication channel connected between the head-end and the set-top box; And

(마) 통신용 어플리케이션의 종료시, 헤드-엔드와 셋탑박스간의 연결을 해지않은 상태에서 어플리케이션만을 종료하는 단계로 이루어지는 것을 특징으로 한다.(E) At the end of the communication application, the step of terminating only the application in a state in which the connection between the head-end and the set-top box is not terminated.

이하, 첨부한 도면을 참조하여 본 발명에 의한 케이블모뎀 내장형 셋탑박스에서의 통신방법에 대하여 상세하게 설명하고자 한다.Hereinafter, a communication method in a built-in cable modem set top box according to the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 첫번째 단계로, 케이블모뎀을 내장한 셋탑박스의 초기 동작시, 어플리케이션의 실행유무에 관계없이 헤드-엔드와의 연결(connection)을 실행하여, 연결상태를 셋탑박스의 전원오프시까지 유지시키는 것이다. 이때, 셋탑박스와 헤드엔드간의 채널 연결은 기존의 방식대로 이루어질 수 있으며, 특별히 그 구체적인 방식을 한정하지는 않는다.The present invention is the first step, the initial operation of the set-top box with a built-in cable modem, regardless of whether the application is running or not (connection) to the head-end (connection) to maintain the connection state until the set-top box power off It is to let. At this time, the channel connection between the set-top box and the head end may be made in the conventional manner, and the specific method is not particularly limited.

도 2는 본 발명에 따른 케이블모뎀을 내장한 셋탑박스와 헤드엔드와의 통신방법을 보인 플로우챠트로서, 본 발명은 셋탑박스가 설치되어 설치될때(201), 셋탑박스에서 헤드-엔드와의 연결을 시도한다(202). 이에 헤드-엔드와 연결이 완성되면(203), 상기 상태를 계속유지하며(207), 통신용 어플리케이션이 실행되는지를 체크한다(204). 이에, 통신용 어플리케이션의 실행이 시작되면, 상기 어플리케이션의 실행에 따라 연결된 채널을 통해 셋탑박스와 헤드-엔드간에 데이타를 송수신한다(205). 그리고, 통신용 어플리케이션이 종료되면, 다시 셋탑박스와의 연결유지상태로 되돌아간다(207).2 is a flowchart illustrating a communication method between a set-top box and a headend incorporating a cable modem according to the present invention, the present invention is connected to the head-end in the set-top box when the set-top box is installed (201) (202). When the connection with the head-end is completed (203), the state is maintained (207), and it is checked whether the communication application is executed (204). Accordingly, when the execution of the communication application starts, data is transmitted and received between the set-top box and the head-end through the connected channel according to the execution of the application (205). When the communication application is terminated, the communication returns to the connection maintaining state with the set top box again (207).

도 3은 상기 도 2에서 셋탑박스 초기 동작시, 셋탑박스와 헤드엔드간에 이루어지는 신호처리를 보인 것으로서, 셋탑박스의 초기동작시 셋탑박스에서 헤드-엔드로 통신채널을 연결한 후, 셋탑박스는 헤드-엔드에 일정 주기(예를 들어, 60sec)마다 아이들메시지(idle_msg)를 전송하여 연결상태를 유지시킨다. 이때, 헤드-엔드(H/E)에서 정상적으로 상기 셋탑박스에서 전송되는 아이드메시지를 받으면 그에 따른 응답(ACK)을 전송하며, 연결상태는 유지된다. 그러나, 상기 상태에서, 통신선로의 품질저하나 기타 여러이유로 셋탑박스로부터 헤드-엔드 아이들메시지를 설정횟수 이상 전달되지 못하면, 헤드-엔드(H/E)에서 셋탑박스(STB)에 해지할 것인지를 묻는 메시지(release_msg)를 전송하고, 이를 전송받은 셋탑박스(STB)에서 해지를 원하지 않는다는 메시지(rel_rsp_msg)를 전송하여, 연결이 해제되지 않도록 한다. 이에, 셋탑박스가 동작하는동안 셋탑박스와 헤드-엔드간에는 통신채널 연결상태가 유지된다.3 shows signal processing between the set-top box and the head end during the initial operation of the set-top box in FIG. 2, after connecting the communication channel from the set-top box to the head-end during the initial operation of the set-top box, the set-top box is head The idle message (idle_msg) is transmitted to the end every certain period (for example, 60 sec) to maintain the connection state. At this time, when the head-end H / E receives the ID message normally transmitted from the set-top box, the response ACK is transmitted, and the connection state is maintained. However, in the above state, if the head-end idle message is not transmitted from the set-top box more than the set number of times due to the poor quality of the communication line or other reasons, whether to terminate the set-top box (STB) at the head-end (H / E) A message (release_msg) is transmitted and a message (rel_rsp_msg) indicating that the release is not desired from the set-top box (STB) that has received the message, so that the connection is not released. Thus, the communication channel is maintained between the set-top box and the head-end while the set-top box is operating.

도 3은 이상 설명한 바와 같이 셋탑박스와 헤드-엔드와의 연결이 유지되는 상태에서 셋탑박스내의 통신용 어플리케이션의 실행시 이루어지는 처리과정을 보인 것으로서, 통신용 어플리케이션(verifier)이 실행되면, 어플리케이션계층에서 미들웨어(CME : Cable Modem Extention)으로 통신채널을 링크시키는 메시지(o_link_open)가 전달되고, 이에 미들웨어로부터 케이블모뎀의 드라이버장치로 통신채널을 연결하라는 명령이 내려진다. 이때, 상기 셋탑박스와 헤드-엔드간에 MAC계층에서 연결이 이미 이루어진 상태이므로, 드라이버로부터 미들웨어로 통신채널이 이미 연결되었음을 알리는 메시지(drv_open_notify)가 바로 전송된다.3 illustrates a process performed when the communication application in the set-top box is maintained while the connection between the set-top box and the head-end is maintained as described above. When the communication application verifier is executed, the middleware (i. A message (o_link_open) is transmitted to link the communication channel with CME: Cable Modem Extension, and the command to connect the communication channel from the middleware to the driver device of the cable modem is issued. At this time, since the connection is already established in the MAC layer between the set-top box and the head-end, a message (drv_open_notify) indicating that the communication channel is already connected from the driver to the middleware is immediately transmitted.

따라서, 셋탑박스에서 헤드-엔드로 연결을 시도하는데 소요되는 시간이 그만큼 단축된다. 이때, 연결시도에 소용되는 시간은 10여초로서, 전체 어플리케이션의 수행시간에 있어서 큰 비중을 차지하는 시간인데, 그만큼의 시간이 단축됨으로서, 처리속도의 향상을 가져올 수 있다.Thus, the time required to attempt a connection from the set-top box to the head-end is shortened by that much. In this case, the time required for the connection attempt is about 10 seconds, which is a time that takes a large proportion in the execution time of the entire application, and as the time is shortened, the processing speed may be improved.

이때, DHCP(Dynamic Host Configuration Protocol)에 의하여 데이타송수신을 위한 주소설정이 이루어진다.At this time, an address setting for data transmission and reception is performed by using a Dynamic Host Configuration Protocol (DHCP).

그리고, 상기와 같이 통신채널 연결완료를 나타내는 메시지(link_open_notify)가 어플리케이션으로 전해지면, 해당 어플리케이션은 이후, 헤드-엔드와 데이타를 송수신하게 된다.When the message link_open_notify indicating the completion of the communication channel connection is transmitted to the application as described above, the application subsequently transmits and receives data with the head-end.

그 후, 어플리케이션이 종료될때, 어플리케이션(verifier)으로부터 통신채널의 연결을 해지하라는 메시지(o_link_close)가 전송되고, 이에 미들웨어는 드라이버에 통신채널 연결의 해지를 명령한다.Then, when the application is terminated, a message (o_link_close) is sent from the application (verifier) to disconnect the communication channel, the middleware instructs the driver to terminate the communication channel connection.

이때, 상기 드라이버는 MAC계층의 연결을 해지하지 않고 미들웨어로 이미 해지되었다는 메시지(drv_close_notify)를 전송한다.In this case, the driver transmits a message (drv_close_notify) indicating that the driver has already terminated the middleware without disconnecting the MAC layer.

따라서, 셋탑박스와 헤드-엔드간의 연결은 유지된 상태에서, 어플리케이션만 종료된다.Therefore, only the application is terminated while the connection between the set-top box and the head-end is maintained.

이후, 어플리케이션이 수행되지 않는 동안 상기 드라이버에서는 상술한 바와 같이 헤드-엔드로 통신채널의 연결유지를 위해서 일정 주기로 아이드메세지(idle_msg)를 송신한다.Thereafter, while the application is not running, the driver transmits the idle message idle_msg at a predetermined period to maintain the connection of the communication channel to the head-end as described above.

따라서, 본 발명에 의하면, 셋탑박스와 헤드-엔드간에 물리계층 및 MAC계층의 연결(connection)을 어플리케이션의 수행여부에 관계없이 항시 유지시킴으로서, 케이블모뎀을 내장한 셋탑박스에서 통신용 어플리케이션의 단축시키는 우수한 효과가 있으며, 결과적으로, 보다 빠른 실행속도를 제공할 수 있는 우수한 효과가 있는 것이다.Therefore, according to the present invention, by maintaining the connection between the physical layer and the MAC layer between the set-top box and the head-end regardless of whether the application is performed at all times, it is excellent to shorten the communication application in the set-top box with a cable modem There is an effect, and as a result, there is an excellent effect that can provide faster execution speed.

Claims (1)

케이블모뎀 내장형 셋탑박스에서의 통신 방법에 있어서,In the communication method in a cable modem built-in set-top box, (가) 셋탑박스의 초기동작시 헤드-엔드와 물리계층 및 MAC계층에서 연결을 실시하는 단계;(A) performing the connection at the head-end, the physical layer and the MAC layer during the initial operation of the set-top box; (나) 헤드-엔드와 셋탑박스간에 연결이 이루어지면, 어플리케이션이 수행되지 않는 동안, 일정 주기로 메시지를 송수신하여 연결을 유지시키는 단계;(B) if a connection is made between the head-end and the set-top box, while the application is not performed, sending and receiving a message at regular intervals to maintain the connection; (다) 셋탑박스내의 통신어플리케이션 실행시, DHCP처리에 의해 셋탑박스의 주소를 설정하는 단계;(C) setting the address of the set-top box by DHCP processing when executing the communication application in the set-top box; (라) 상기 헤드-엔드와 셋탑박스간에 연결된 통신채널을 통해 상기 (다)단계에서 설정된 주소로 데이타를 송수신하는 단계; 및(D) transmitting and receiving data to the address set in step (c) through a communication channel connected between the head-end and the set-top box; And (마) 통신용 어플리케이션의 종료시, 헤드-엔드와 셋탑박스간의 연결을 해지않은 상태에서 어플리케이션만을 종료하는 단계로 이루어지는 것을 특징으로 하는 케이블모뎀 내장형 셋탑박스에서의 통신 방법.(E) A method of communication in a cable modem built-in set top box, characterized in that, when the communication application is terminated, only the application is terminated without disconnection between the head-end and the set-top box.
KR10-2001-0034697A 2001-06-19 2001-06-19 Method for communicating in set-top box with cable modem KR100392630B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100403301B1 (en) * 2001-08-02 2003-10-23 전자부품연구원 MAC processing equipment applying to POD module of the open cable, method for operating the same and MAC processing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100403301B1 (en) * 2001-08-02 2003-10-23 전자부품연구원 MAC processing equipment applying to POD module of the open cable, method for operating the same and MAC processing method

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