WO2002091676A1 - Derivation d'abonne permettant de surveiller l'etat d'une ligne de transmission a l'extremite abonne et systeme de commande a distance et procede mettant en oeuvre ce systeme - Google Patents

Derivation d'abonne permettant de surveiller l'etat d'une ligne de transmission a l'extremite abonne et systeme de commande a distance et procede mettant en oeuvre ce systeme Download PDF

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Publication number
WO2002091676A1
WO2002091676A1 PCT/KR2002/000852 KR0200852W WO02091676A1 WO 2002091676 A1 WO2002091676 A1 WO 2002091676A1 KR 0200852 W KR0200852 W KR 0200852W WO 02091676 A1 WO02091676 A1 WO 02091676A1
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WO
WIPO (PCT)
Prior art keywords
tap
signal
subscriber
unit
controlling
Prior art date
Application number
PCT/KR2002/000852
Other languages
English (en)
Inventor
Hak-Hee Kim
Original Assignee
Hoseo Telecom Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoseo Telecom Co., Ltd filed Critical Hoseo Telecom Co., Ltd
Publication of WO2002091676A1 publication Critical patent/WO2002091676A1/fr

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Classifications

    • 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
    • H04N21/615—Signal processing at physical level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • 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
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
    • H04N21/6473—Monitoring network processes errors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity

Definitions

  • the present invention relates to data communications, and more particularly to a subscriber tap-off capable of sensing problems such as line break, short circuit, and noise generated at a transmission line connected to a subscriber terminal associated with, for example, Internet or cable TV services, and a remote control system and method capable of identifying the cause of the problem generated at the transmission line based on the sensed result by the subscriber tap-off, thereby securing an efficient data transmission.
  • the Internet has been mainly used as a tool allowing users to easily acquire diverse information.
  • Such Internet has greatly contributed to development of information technologies (ITs).
  • ITs information technologies
  • communication providers Taking into consideration an increase in the number of subscribers, communication providers have given priority to the expansion of installations for accommodating the increased number of subscribers, rather than the quality management of transmission networks.
  • HFC hybrid fiber coaxial cable
  • the present invention has been made in view of the above mentioned problems, and an object of the invention is to achieve an enhancement in communication quality meeting the demands of subscribers.
  • Another object of the invention is to rapidly solve problems generated in the network.
  • Another object of the invention is to provide a remote control system capable of controlling subscriber connection and disconnection operations in a bidirectional communication fashion, easily identifying an unauthorized user, and rapidly identifying the position of a drop line connected to a subscriber terminal where a problem such as line break, short circuit or noise occurs.
  • the present invention provides a subscriber tap-off for supplying a data communication signal to a user terminal via an associated one of tap ports, the subscriber tap-off operating in accordance with a tap port control signal from a main control terminal via a network, comprising: a signal detecting unit for detecting whether or not line break or short circuit is generated at a drop line connected between the user terminal and the tap port, thereby monitoring the drop line; and a tap-off controlling unit for receiving information about the detected result from the signal detecting unit, and switching on or off the tap port, based on the received information.
  • the present invention provides a remote control system for controlling a user terminal connected thereto via a network by transmitting a control signal to the user terminal in a remote fashion, comprising: a subscriber tap-off for detecting at least one of communication line problems associated with a line break or short circuit generated at a drop line connected to the user terminal, and noise generated at the drop line, thereby switching on and off a tap port connected to the drop line; and a main control terminal for at least one function for switching on and off a connected state of the tap port, and transrmtting a tap port ON/OFF signal to the subscriber tap-off, whereby the drop line is monitored.
  • the present invention provides a remote control method carried out using a remote control system for controlling a user terminal connected thereto via a network by transmitting a control signal to the user terminal in a remote fashion, comprising the steps of: controlling a subscriber tap-off included in the remote control system to sense at least one of communication line problems associated with a line break or short circuit generated at a communication line connected to the user terminal, and noise generated at the communication line; and controlling a main control terminal included in the remote control system to generate a signal for controlling the subscriber tap-off, thereby controlling a tap port ON/OFF operation of the subscriber tap-off in accordance with at least one control function, whereby the communication line is monitored.
  • Fig. 1 is a block diagram illustrating a subscriber tap-off for monitoring respective states of transmission lines connected to subscriber terminals, and a remote control system using the subscriber tap-off;
  • Fig. 2 is a circuit diagram illustrating a detailed configuration of the subscriber tap-off shown in Fig. 1;
  • Figs. 3a and 3b are flow charts illustrating a remote control method according to an embodiment of the present invention.
  • Fig. 1 is a block diagram illustrating a subscriber tap-off for monitoring respective states of transmission lines connected to subscriber terminals, that is, drop lines, associated with, for example, Internet or cable TV services, and a remote control system using the subscriber tap-off.
  • the remote control system includes a main control personal computer (PC) 100 for receiving information about a problem generation position where a problem such as line break, short circuit, or noise has been generated at a drop line, which is a data communication line, thereby automatically controlling the turning-on and -off of the tap port associated with the drop line.
  • the remote control system also includes a radio frequency (RF) modem 200 for modulating signals transmitted from the main control PC 100 while demodulating signals received via a network 300, and an intelligent addressable tap-off (ITAP) 400 as a subscriber tap-off.
  • the ITAP 400 senses a line break or short circuit generated at tap ports connected to respective subscriber terminals while measuring signal noise generated at drop lines connected to respective tap ports thereof.
  • the ITAP 400 automatically switches on and off its tap ports under the control of the main control PC 100, and transfers data communication signals via a drop terminal for a cable modem 500 connected to a user PC 600 or a drop terminal for a set-top box 700 connected to a TV 800.
  • the main control PC 100 includes a subscriber tap-off control module 110 for storing a program adapted to check occurrence of problems in the subscriber tap-off 400, and a control result database 120 for storing information about the result of a remote control carried out by the main control PC 100, and information about subscriber terminals connected to the subscriber tap-off 400.
  • the subscriber tap-off control module 110 and control result database 120 may have other configurations.
  • the subscriber tap-off 400 includes a signal splitting unit 410 for splitting a test signal, and a tap port ON/OFF control signal from the main control PC 100, a filtering unit 420 for selecting only a signal of a particular frequency band, and a modulating unit 430 for modulating a transmission .
  • signal for transmitting problem generation position information associated with drop lines, at which generation of problems such as line break, short circuit or noise is sensed.
  • the subscriber tap-off 400 also includes a data detecting unit 440 for detecting data contained in the test and control signals transmitted from the main control PC 100, a noise detecting unit 450 for automatically detecting noise signals generated at the drop lines, a tap-off controlling unit 460 for recognizing drop lines at which a problem associated with line break, short circuit or noise has been generated, receiving a tap port ON/OFF control signal, perforrriing a tap port ON/OFF control for a tap port associated with the received tap port ON/OFF control signal, in response to the tap port ON/OFF control signal, and generating a tap-off operation control signal, and a signal detecting unit 470 for detecting problems associated with line break and short circuit and generated at each, of the drop lines.
  • a data detecting unit 440 for detecting data contained in the test and control signals transmitted from the main control PC 100
  • a noise detecting unit 450 for automatically detecting noise signals generated at the drop lines
  • a tap-off controlling unit 460 for recognizing drop lines at which a problem
  • Fig. 2 is a circuit diagram illustrating a detailed configuration of the subscriber tap-off 400 shown in Fig. 1.
  • the signal splitting unit 410 includes one or more signal splitters. Each signal splitter serves to split an operation control signal in order to distribute the operation control signal to the filtering unit 420, noise detecting unit 450, and signal detecting unit 470.
  • the filtering unit 420 includes one or more bandpass filters (BPF) 420.
  • BPF bandpass filters
  • Each BPF 420 receives the distributed signal from the signal splitting unit 410, filters the received signal, and transmits the filtered signal to the data detecting unit 440.
  • Each BPF 420 also serves to filter a modulated signal from the modulating unit 430 before the modulated signal is sent to the main control PC 100.
  • the modulating unit 430 performs a frequency modulation for signals from the tap-off controlling unit 460 to be sent to the main control PC 100.
  • the data detecting unit 440 receives a signal filtered by the filtering unit 420, and detects data from the filter signal, which is an RF signal.
  • the data detecting unit 440 also transfers data noise detected by the noise detecting unit 450 to the tap-off controlling unit 460.
  • the noise detecting unit 450 detects signal noise received via the signal detecting unit 470.
  • the tap-off controlling unit 460 performs identification of the tap port
  • ON/OFF state and control for tap port switching on/off operations senses generation of line break, short circuit, and noise at drop lines, and transmits, to the main control PC 100, data associated with the line break, short circuit, and noise generated at the drop lines.
  • the signal detecting unit 470 includes a voltage supply module 471 including resistors RI and R2 for distributing a supply power, and capacitors Cl and C2 for cutting off DC components while serving to supply a power supply voltage VCC to integrated circuits (IC) 472.
  • the ICs 472 are also included in the signal detecting unit 470. Each IC 472 serves to receive a control signal generated from a central processing unit (CPU) included in the tap-off control unit 460 in response to variations in respective voltages applied to the resistors R3 and R4, thereby switching on or off the tap port associated therewith.
  • CPU central processing unit
  • the signal detecting unit 470 also includes a detecting module 473 including resistors R3 and R4 for detecting line break and short circuit, and a capacitor C3 for passing a signal adapted to supply a data signal to each subscriber terminal.
  • a detecting module 473 including resistors R3 and R4 for detecting line break and short circuit, and a capacitor C3 for passing a signal adapted to supply a data signal to each subscriber terminal.
  • the reference numeral "900" denotes a directional coupler.
  • drop line used in the illustrated embodiment of the present invention represents a communication line extending from the subscriber tap-off 400 to the cable modem 500. Line break, short circuit, or signal noise may be generated in such a drop line.
  • the subscriber tap-off 400 opens its tap port or ports by the IC performing a switching operation in accordance with a control signal received thereto.
  • Figs. 3a and 3b are flow charts illustrating a remote control method according to an embodiment of the present invention.
  • the tap-off controlling unit 460 checks, for a predetermined period of time, whether or not line break, short circuit or noise has been generated, while transmitting data received via the network to the drop terminal of the cable modem 500 of each user PC 600 (Step S100).
  • the checking of line break and short circuit is carried out using a voltage drop method. That is, this checking is carried out by detecting a variation in voltage depending on a variation in the resistances of the resistors R3 and R4. For example, an increase in voltage occurs under the condition in which line break is generated, whereas a voltage drop occurs under the condition in which short circuit is generated, or unauthorized communication line sharing occurs.
  • the tap-off controlling unit 460 determines a normal state when the checked voltage corresponds to 3V, a line break state when the checked voltage corresponds to 5V, and a short circuit state when the checked voltage corresponds to 0V. Generation of noise is also checked. This checking is carried out by the noise detecting unit 450. That is, the noise detecting unit 450 checks, for each drop line, whether or not noise is generated at the drop line, by sensing low-band noise. The tap-off controlling unit 460 also checks, for each tap port, whether or not the tap port Is being used, and sends information about the checked result.
  • the subscriber tap-off control module 110 of the main control PC 100 reads out information about each subscriber tap-off 400 stored in the control result database 120, and generates a test signal for the subscriber tap-off 400, based on the read-out information (Step SI 10).
  • the operator desires to randomly generate a test signal, this can be achieved by operating the subscriber tap-off control module 110.
  • the present invention is limited to such an operation.
  • the main control PC 100 sends the test signal to the RF modem 200 which, in turn, modulates the test signal.
  • the modulated test signal from the RF modem 200 is then transmitted to the subscriber tap-off 400 via the network 300.
  • the signal splitting unit 410 of the subscriber tap-off 400 splits the test signal in order to distribute the test signal to the filtering unit 420 and signal detecting unit 470.
  • the filtering unit 420 filters the received test signal, and sends the resultant signal to the data detecting unit 440.
  • the data detecting unit 440 detects data contained in the signal applied thereto, and transmits the detected data.
  • the CPU of the tap-off control unit 460 detects the address of the test signal applied thereto (Step S120), and checks, based on the detected address, whether or not the test signal is associated with a desired address (Step SI 30). When it is determined that the test signal is associated with a desired address, the address of the test signal is identified in order to receive the test signal (Step S140).
  • the CPU of the tap-off control unit 460 requests the signal detecting unit 470 to send information about all tap ports, for example, 8 tap ports in the illustrated case, in order to read out the information (Step SI 50).
  • the signal detecting unit 470 determines whether or not the voltages distributed to the resistors R3 and R4 vary, and transmits the determined result to the CPU of the tap-off control unit 460.
  • the CPU of the tap-off control unit 460 determines, for each drop line, whether or not a problem associated with line break or short circuit occurs at the drop line, based on the result of the voltage variation deterrr ⁇ iation sent from the signal detecting unit 470 (Step 160).
  • the CPU of the tap-off control unit 460 receives check signals from respective ICs, that is, IC1 to ICS, and transmits information about the 8 tap ports to the modulating unit 430, based on the received check signals.
  • the modulating unit 430 performs a frequency modulation for the information received from the CPU of the tap-off control unit 460, and transmits the modulated signal to the main control PC 100 via the filtering unit 420 (Step
  • the tap-off control unit 460 passes the received test signal (Step SI 80).
  • the subscriber tap-off control module 110 of the main control PC 100 receives the signal from the subscriber tap-off 400 demodulated by the RF modem 200 to detect tap information (Step SI 90). Based on the detected tap information, the subscriber tap-off control module 110 checks, for each tap port, whether or not the tap port is in a normal state (step S200). In accordance with the checked result, the operator selects whether the tap port is to be switched on or off (Step S210). In this case, the operator manually switches on or off the tap port. This switching manipulation can be carried out for respective tap ports.
  • the subscriber tap-off control module 110 has an auto function for switching on each tap port when its drop line is normally used, an automatic recovery function for automatically switching off each tap port when line break or short circuit is generated at its drop line, and automatically switching on the switched-off tap port after a recovery of the drop line, and a forced ON/OFF function for controlling the switching ON/OFF operations for all-tap ports individually or simultaneously.
  • the forced ON/OFF function is carried out in response to a control command from the main control PC 100.
  • This forced ON/OFF function has a priority over the tap auto function.
  • the switching from the forced ON/OFF mode to the tap auto mode is achieved only when the subscriber tap- off control module 120 of the main control PC 100 performs a reset operation.
  • the tap port or ports automatically opened due to line break or short circuit may be switched on again in accordance with a control command from the subscriber tap-off control module 120.
  • the associated tap port cannot be automatically switched on even when its drop line is recovered to its normal state.
  • the subscriber tap-off control module 110 checks whether or not a tap port ON/OFF control is selected by the operator (Step S220). Where the operator selects the tap port ON/OFF control, the subscriber tap-off control module 110 generates a tap port ON/OFF control signal (Step S230), and sends the generated signal to the subscriber tap-off 400.
  • the CPU of the tap-off control unit 460 checks the transmission address of the control signal (Step S240), while checking whether or not the control signal is a priority release request signal (Step S250).
  • control signal is the priority release request signal
  • the CPU of the tap-off control unit 460 automatically resets the associated IC of the signal detecting unit 470 via its tap port ON/OFF control terminal (Step S260).
  • control signal is not the priority release request signal, but an ON/OFF signal for individual or all tap ports (Step S270), the CUP switches on or off the tap ports individually or simultaneously.
  • the associated IC After completion of the automatic resetting step S260, the associated IC sends information about its 8 tap ports to the CPU of the tap-off control unit 460 (Step S28 ).
  • the CPU sends control result information collected from all ICs to the subscriber tap-off control module 110 of the main control
  • the subscriber tap-off control module 110 receives the control result information (Step S300), and stores it in the control result database 120 (Step S300).
  • the subscriber tap-off capable of monitoring respective states of transmission lines at subscriber ends, and the remote control system and method using the subscriber tap-off can achieve an enhancement in communication quality meeting the demands of subscribers.
  • the consumers can receive network services of a high quality in accordance with rapid after-services. They can also receive network signals only at a desired time.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

La présente invention concerne une dérivation d'abonné permettant de surveiller des états respectifs de lignes de transmission à des extrémités abonné, ainsi qu'un système de commande à distance et un procédé mettant en oeuvre ce système. La commande à distance est réalisée en commandant la dérivation d'abonné, afin de détecter une rupture de ligne ou un court-circuit produit au niveau d'une ligne de communication qui est connectée à un terminal d'utilisateur et du bruit produit au niveau de la ligne de communication et en commandant un terminal de commande principal, afin de produire un signal permettant de commander la dérivation d'abonné, ce qui permet de commander le fonctionnement marche/arrêt d'un port de dérivation de la dérivation d'abonné et ainsi de surveiller la ligne de communication.
PCT/KR2002/000852 2001-05-08 2002-05-08 Derivation d'abonne permettant de surveiller l'etat d'une ligne de transmission a l'extremite abonne et systeme de commande a distance et procede mettant en oeuvre ce systeme WO2002091676A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2001-0024910A KR100401424B1 (ko) 2001-05-08 2001-05-08 가입자단 전송로 상태를 감시할 수 있는 가입자 분기기용단말기와 이를 이용한 원격 제어 시스템 및 원격 제어 방법
KR2001/0024910 2001-05-08

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WO2002091676A1 true WO2002091676A1 (fr) 2002-11-14

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