KR100868659B1 - System for providing communication service using passive fiber-coaxial network - Google Patents

Abstract

The present invention is configured to provide a high speed data service by applying a passive optical subscriber network technology, to provide a high-speed data service, and by applying a coaxial transmission technology to provide a switching function in the proximity to the subscriber end, optimized in the field Disclosed is a communication service providing system using a passive optical coaxial network for providing an effective broadcast communication convergence service. In a communication service providing system using a passive optical coaxial network according to the present invention, an optical signal transmitting / receiving means in a broadcasting / communication company for transmitting signal data through a first optical cable, and signal data received through the first optical cable, Optical distribution means for distributing to a fiber node via an optical cable, and coaxial signal transceiving means for inputting the signal data processed by the processing processing means in the fiber node to the indoor terminal via a coaxial cable; .

Optical Coaxial Mixed Network, Passive Optical Subscriber Network, Fiber Node, Switching, Signal Data

Description

Communication service providing system using passive optical axis network {SYSTEM FOR PROVIDING COMMUNICATION SERVICE USING PASSIVE FIBER-COAXIAL NETWORK}

1 is a diagram showing an overall network configuration for providing a communication service using a passive optical subscriber network according to the prior art.

2 is a diagram illustrating an overall network configuration for providing a communication service using an optical coaxial mixed network according to the related art.

3 is a diagram illustrating a configuration of a communication service providing system using a passive optical coaxial network according to an embodiment of the present invention.

4 is a diagram illustrating an overall network configuration of a communication service providing system using a passive optical coaxial network according to an embodiment of the present invention.

5 is a diagram showing the configuration of a node master of the coaxial signal transmitting and receiving means according to an embodiment of the present invention.

6 is a diagram illustrating a configuration of a modem of a domestic terminal according to an embodiment of the present invention.

FIG. 7 illustrates a configuration of an overlay module that replaces the first WDM when the wavelength on which the broadcast signal is loaded is 1310 nm according to another embodiment of the present invention.

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

300: communication service providing system 310: optical signal transmission and reception means

311: OLT 312: OTX

313: first WDM 320: light distribution means

330: processing means 331: second WDM

332: ONT 333: downward optical receiver

340: coaxial signal transmission and reception means 341: node master

342: down amplifier 343: combiner

The present invention is configured to provide a high speed data service by applying a passive optical subscriber network technology, to provide a high-speed data service, and by applying a coaxial transmission technology to provide a switching function in the proximity to the subscriber end, optimized in the field The present invention relates to a communication service providing system using a passive optical coaxial network for providing an effective broadcast communication convergence service.

Passive Optical Network (PON) is a system that delivers signal data for a broadcast service or a communication service to an end user through an optical cable network. PON is a network that connects the central office (CO), a provider of services, and the subscriber (subscriber), using only passive optical devices, and share the multiplexed voice, data, or video service on an optical signal. It is a system that passively transmits to subscribers through fiber and optical splitter.

1 is a diagram showing an overall network configuration for providing a communication service using a passive optical subscriber network according to the prior art.

According to the conventional time division method passive optical subscriber network shown in the drawings, an optical central control unit that performs service provision, network control and control of the upper network connection, performing L3-class switching or routing functions in the CO (115) The optical network starts from the optical line terminal (OLT) 110 and is connected to the optical splitter 130 installed outdoors through the optical cable 120.

The optical splitter 130 is an optical star coupler (OSC), and distributes signal data received through a single optical fiber in a one-to-N manner so that it can be transmitted to a plurality of subscribers through independent optical fibers.

Connected to the place where the subscriber group is gathered from the optical splitter 130 through the optical cable 120, although omitted in Figure 1, there exists an ONU (Optical Network Unit, Optical Network Unit) at the end point, join from the ONU It is connected one-to-one to one's own network or subscriber 145, and has a network configuration leading to the final termination of the subscriber network or the ONT (Optical Network Terminal) 140 in the subscriber's premises.

The data communication system through the passive optical subscriber network has recently been in the spotlight with various advantages such as easy maintenance of the network by providing only passive optical elements outdoors and the provision of high-speed data services. However, the data communication system using the passive optical subscriber network has a weak price competitiveness compared to a hybrid fiber coaxial (HFC) network using a xDSL (Digital Subscriber line) or a coaxial cable network using a telephone line, thus making it difficult to enter the market. Are going through.

On the other hand, the optical coaxial mixed network is economical because it uses a network by sharing a large number of subscribers, and serves as an axis of the network infrastructure by providing a broadcasting service using the 55 to 750 (or 860) MHz band as a basic.

2 is a diagram illustrating an overall network configuration for providing a communication service using an optical coaxial mixed network according to the related art.

The optical coaxial mixed network includes an optical transmitter (OTX) 231 for transmitting a CATV broadcasting signal, an optical receiver (ORX) 233 for receiving an uplink data signal (or an IP signal), and an L3-class. Broadcasting / communication office 230 consisting of a cable modem terminal system (CMTS) 232 performing a switching / routing function, and an optical or 240 optical signal of a CATV up-down signal connected outdoors by an optical cable 240 ONU 250 that performs conversion, amplification, and equalization functions, a TV receiver 271 that receives a broadcast signal in the subscriber's premises, a cable modem 272 that is an optical terminal device for Internet communication, and a coaxial cable. And a coaxial network 260 such as a diverter and a distributor.

However, in order to upgrade the optical coaxial network, it is necessary to replace all expensive equipment or to reduce the number of subscribers in a cell by adding CMTS and ONU.

In order to reduce the cost per line while maintaining the same level of performance as the conventional passive optical subscriber network, the number of subscribers connected per port of the OLT should be increased, while in order to advance the optical coaxial mixing network, the bandwidth of the used channel should be increased. The minimum number of subscribers per cell should be reduced. In order to solve these problems at the same time in the present invention, the optical section is composed of a passive optical subscriber network, the coaxial section is implemented by a distributed switching system coaxial network, to provide a high-speed data service and effective broadcast communication convergence service optimized for the field I would like to propose a new technology.

The present invention has been made to solve the above problems, an object of the present invention, to take advantage of the high-speed transmission of the passive optical subscriber network while minimizing the number of the first optical cable, as well as close the node master as close to the subscriber It is to provide a communication service providing system using a passive optical coaxial network that provides a more effective broadcasting and telecommunications convergence service while increasing the transmission rate per subscriber at an economic investment cost. That is, the object of the present invention is to increase the number of subscribers accommodated in expensive OLT equipment to optimize the unit cost per subscriber, and to provide flexibility and scalability of the network through expansion of a master card in a fiber node. In addition, the present invention provides a communication service providing system using a passive optical coaxial network that enables high-speed transmission of 200 Mbps or more by allocating a bandwidth of 30 MHz or more on a coaxial network.

In addition, another object of the present invention is to improve the field workability by having a node master having a switching function in the subscriber dense area compared to the conventional technology in which switching and transmission equipment exists only on the broadcasting / communication office side. In addition, the present invention provides a communication service providing system using a passive optical coaxial network capable of designing the number of master cards arbitrarily and optimally designing the number of subscribers connected per fiber node according to the site.

In addition, another object of the present invention is to avoid the degradation of the signal due to the up-noise and the performance degradation of the signal in the conventional optical coaxial mixed network through the digitization of the optical cable section, the transmission rate according to the increase in subscribers per fiber node To provide a communication service providing system using a passive optical coaxial network that can solve the degradation of the node master through the expansion of the node master.

In addition, another object of the present invention, by applying a pre-installed optical coaxial mixing (HFC) network to advance the optical cable without additional installation of the first optical cable in the section from the broadcasting / telecommunications station to the passive optical distributor box The present invention provides a communication service providing system using a passive optical coaxial network that enables cell division of an existing HFC network.

In addition, another object of the present invention is to provide a communication service providing system using a passive optical coaxial network that can be applied to the existing BPON, EPON, GEPON, GPON, WDMPON, DOCSIS, PLC and MoCa technology as it is.

In order to achieve the above object of the present invention, a communication service providing system using a passive optical coaxial network according to the present invention, the optical signal transmission and reception means in the broadcasting / communication station for transmitting the signal data through the first optical cable, and Optical distribution means for distributing signal data received through a first optical cable to a fiber node via a second optical cable, and the distributed signal data processed by a processing means in the fiber node. And a coaxial signal transmitting / receiving means for inputting to the indoor terminal through a coaxial cable.

Hereinafter, a communication service providing system using a passive optical coaxial network according to the present invention will be described with reference to the accompanying drawings.

3 is a diagram illustrating a configuration of a communication service providing system using a passive optical coaxial network according to an embodiment of the present invention.

The communication service providing system 300 includes an optical signal transmitting and receiving means 310 in a broadcasting / communication company, an optical distribution means 320 in a passive optical distributor box, a processing processing means 330 in a fiber node, and a fiber node. It may be composed of the coaxial signal transmitting and receiving means 340 in the.

First, the optical signal transmitting and receiving means 310 is installed in a broadcasting / communication company, and transmits signal data from the broadcasting / communication company to a subscriber side or a passive optical splitter through a first optical cable of a passive optical coaxial network. In addition, the optical signal transmitting and receiving means 310 may serve to receive the signal data transmitted from the subscriber side or from the passive optical distributor box through the first optical cable of the passive optical coaxial network.

In the present invention, the signal data may be an IP signal corresponding to a broadcast signal such as CATV received from a broadcasting network or communication data received and retransmitted from an Internet network or a subscriber. In addition, the signal data may be a broadcast signal or an IP signal generated from the broadcast / communication company. The signal data may be a first optical signal in which the IP signal is totally converted, a second optical signal in which the broadcast signal is totally converted, or a signal in which the first optical signal and the second optical signal are combined. The IP signal is signal data for Internet service and various additional services.

The optical signal transmitting and receiving means 310 may be composed of an OLT 311, an OTX 312, and a first WDM 313.

The OLT 311 is retransmitted and received from the Internet network or the subscriber side, or after switching or routing the IP signal generated from the broadcasting / communication company, all-optical conversion to the first optical signal.

The OTX 312 converts a broadcast signal received from the broadcast network or generated from the broadcast / communication company into a second optical signal.

The first WDM 313 combines the first optical signal and the second optical signal, which are all-optically converted in the OLT 311 and the OTX 312, by using a wavelength division scheme, and through the first optical cable of the passive optical coaxial network. Transmit to subscriber side or passive optical distributor. In addition, the first WDM 313 transmits the signal data (IP signal) transmitted from the subscriber side or from the passive optical splitter box through the first optical cable of the passive optical coaxial network in a wavelength division manner to the first optical signal and the second optical signal. It can also be separated.

Subsequently, the optical distribution means 320 receives signal data, which are all-optical converted and combined by the optical signal transmission / reception means 310 of the broadcasting / communication office, through the first optical cable of the passive optical coaxial network, It is distributed to a fiber node connected through a second optical cable.

The light distribution means 320 may be installed spaced apart from the broadcasting / communication company. For example, the light distribution means 320 may be installed in a passive light splitter box that is connected with the first optical cable and the second optical cable. The signal data distributed by the optical distribution means 320 can be distributed to the fiber node located closer to the subscriber side through the second optical cable, so that the high-speed transmission using the optical cable, as well as installed close to the site Fiber nodes allow for more efficient communication. That is, according to the present invention, the node master in the fiber node can be infiltrated as close to the subscriber as possible, thereby increasing the transmission speed per subscriber at an economical investment cost and providing a more effective broadcast communication convergence service.

The processing means 330 then processes the signal data distributed by the optical distribution means 320 in the fiber node to the subscriber side via coaxial networks such as coaxial cables, splitters and splitters. do. In addition, the processing unit 330 may process the signal data (IP signal) transmitted from the subscriber side through the coaxial network to be transmitted to the broadcasting / communication station through the first optical cable and the second optical cable. .

The processing means 330 may be composed of a second WDM 331, an ONT 332, and a downward optical receiver 333.

The second WDM 331 converts the signal data received and distributed from the optical distribution means 320 through the second optical cable of the passive optical coaxial network to the first optical signal obtained by all-optical conversion of the IP signal, and the all-optical conversion of the broadcast signal. The signal is separated into one second optical signal and input to the ONT 332 and the downlink optical receiver 333, respectively.

The ONT 332 photoelectrically converts the separated first optical signal and transmits it to the node master 341 of the coaxial signal transmission and reception means 340, and the downlink optical receiver 333 photoelectrically converts the separated second optical signal. Thus, the signal is transmitted to the downlink amplifier 475 of the coaxial signal transmitting and receiving means 340. In this case, the photoelectrically converted first optical signal may be an Ethernet signal.

Finally, the coaxial signal transmitting and receiving means 340 inputs the signal data processed by the processing processing means 330 to the indoor terminal on the subscriber side via the coaxial cable. In addition, the coaxial signal transmitting and receiving means 340 may receive and separate the signal data from the subscriber terminal's indoor terminal through the coaxial cable and transmit the signal data to the processing processor 330, respectively.

The coaxial signal transmitting and receiving means 340 may be installed in the fiber node together with the processing processor 330, and the coaxial signal transmitting and receiving means 340 may include a node master 341, a down amplifier 342, and a combiner ( 343).

The node master 341 generates (converts or amplifies) a coaxial signal that can be inputted to the indoor terminal on the subscriber side through the coaxial network by using the first optical signal converted photoelectrically from the ONT 332 of the processing unit 330. )do. In this case, the node master 341 may generate (convert or amplify) a plurality of coaxial signals so that a coaxial signal may be transmitted to a subscriber through a plurality of coaxial networks corresponding to the one node master 341. . In addition, the node master 341 is capable of inputting signal data (the photoelectrically converted agent) to the ONT 332 of the processing means 330 using the coaxial signal transmitted from the subscriber side and separated by the combiner 343. 1 optical signal) can be generated (converted or amplified).

The down amplifier 342 generates (coordinates or converts) a coaxial signal that can be inputted to the indoor terminal on the subscriber side through the coaxial network by using the second photoelectrically converted second optical signal from the down amplifier 342 of the processing unit 330. Amplify). In this case, the downlink amplifier 342 may generate (convert or amplify) a plurality of coaxial signals to transmit a coaxial signal to a subscriber side through a plurality of coaxial networks corresponding to the one down amplifier 342. . Further, the downlink amplifier 342 is inputted from the subscriber side and inputs to the downlink amplifier 342 of the processing means 330 by using the coaxial signal separated by the combiner 343 (the photoelectric conversion agent). 2 optical signals).

The combiner 343 combines each of the coaxial signals generated (converted or amplified) from the node master 341 and the down amplifier 342 and transmits the coaxial signals to the subscriber side indoor terminal through the coaxial cable. In addition, the combiner 343 may separate the signal data transmitted via the coaxial cable from the subscriber-side indoor terminal, and transmit the signal data to the node master 341 and the down amplifier 342.

4 is a diagram illustrating an overall network configuration of a communication service providing system using a passive optical coaxial network according to an embodiment of the present invention.

As shown in FIG. 4, the communication service providing system 300 using the passive optical coaxial network according to the present invention comprises an optical signal transmission / reception means 434 including an OLT 431, an OTX 432, and a first WDM 433. ), Processing means 474 consisting of a light distribution means 452 in a passive light distributor box 450, a second WDM 471, an ONT 473, and a downstream light receiver 472, and a node. Coaxial signal transmission and reception means 478 composed of a master 476, a down amplifier 475, and a combiner 477.

The broadcasting / communication office 430 converts the multi-channel broadcast signal received from the broadcasting network 410 into a second optical signal using the OTX 431, and converts the IP signal transmitted and received from the Internet network 420 into an OLT ( After switching or routing using 432, all-optical conversion into a first optical signal is performed, and the first optical signal and the second optical signal are combined in a wavelength division scheme using a first WDM 433.

The combined optical signal is transmitted from the broadcasting / communication office 430 to the outdoor passive optical splitter box 450 through the first optical cable 440, and the optical splitter 451 in the passive optical splitter box 450. And is transmitted from fiber node # 1 470 to N fiber nodes via a plurality of second optical cables 460.

Each fiber node separates the downlink transmitted signal data into a first optical signal and a second optical signal in a wavelength division scheme through a second WDM 471 to process the signals for each signal. That is, the second optical signal corresponding to the broadcast signal separated from the second WDM 471 is generated (photoelectric conversion) by the downlink optical receiver 472 and converted into a plurality of coaxial signals by the downlink amplifier 475. After being amplified and distributed to a plurality of ports, the first optical signal corresponding to the IP signal separated from the second WDM 471 is generated as a coaxial signal (photoelectric conversion, Ethernet signal) by the ONT 473, Node node 476 is distributed into a plurality of coaxial signals.

In this case, the downlink transmission coaxial signal corresponding to the IP signal transmitted from the node master 476 is coaxially coupled to the coaxial signal corresponding to the broadcast signal transmitted from the down amplifier 475 by a frequency division scheme in the combiner 477. The uplink coaxial signal transmitted to the network and corresponding to the IP signal transmitted from the subscriber side is distributed in a frequency division scheme in the combiner 477.

The coaxial signal distributed from each fiber node to each port consists of a trunk bridge amplifier (TBA), a distribution amplifier (DA), a tap-off (TO), a coaxial cable 480, and the like. Each subscriber 490 is input to each subscriber 490 through each coaxial network, and the subscriber 490 receives a broadcast through the TV receiver 491, or receives an internet service and various additional services through a modem 492.

5 is a diagram showing the configuration of a node master of the coaxial signal transmitting and receiving means according to an embodiment of the present invention.

In many fiber nodes, the broadcast signal is separated through the second WDM, then generated as a coaxial signal (photoelectric conversion) by the downlink optical receiver, and amplified and distributed by the down amplifier, while the IP signal is ONT and node. It is converted into a plurality of coaxial signals via a master.

The node master 500 includes an Ethernet interface 510 for performing Ethernet communication with the ONT 473, an Ethernet bridge 520 for switching signals in the same network, and a subscriber. It may be composed of a plurality of master cards (530) for performing high-speed communication with the modem 492 on the side.

Each master card 530 is a medium access controller (MAC) 531 that controls communication with modems 492 on a plurality of subscribers, and a downlink transmitter 532 that modulates and transmits downlink coaxial signals. And an upstream receiver 533 for receiving and demodulating a plurality of subscriber signals.

6 is a diagram illustrating a configuration of a modem of a domestic terminal according to an embodiment of the present invention.

The modem 600 on the subscriber side communicates with the master card 530 included in the node master in the fiber node, the separator 610 for separating the up and down coaxial signals, and receives and demodulates the down coaxial signals. Downlink receiver 620, uplink transmitter 630 for modulating and transmitting uplink coaxial signals, MAC 640 performing a communication protocol, and an Ethernet interface 650 connected to an external device such as a PC. .

The MAC 640 switches base signals and manages transmission and reception of IP signals by exchanging control signals with node masters. That is, the MAC 640 may transmit data in a specific time zone given according to the instruction of the node master, and periodically transmits management information such as the amount of data to be transmitted, the state of the modem, and additional function information to the node master. By transferring, the efficiency of end-to-many communication can be maximized.

According to one embodiment of the present invention, a protocol of end-to-many communication between a node master and a plurality of modems may be driven. The downlink signal starting from the node master arrives at a plurality of modems simultaneously or in similar time zones, and the MAC 640 in each modem determines whether the corresponding signal is its own and selects it. On the other hand, since the uplink signals originating from a plurality of modems arrive at an upstream receiver 533 in one node master along a coaxial network, which is the same transmission medium, data collision may occur. In order to prevent this, the node master grasps time delay information, transmission data amount and channel characteristics of each modem and allocates a specific time band to each modem to be operated, and the modem transmits data within the allocated time. At this time, the node master can change the transmission time actively according to the amount of data to send, thereby increasing network efficiency.

In the communication service providing system using the passive optical coaxial network according to the present invention, it is possible to take advantage of the high-speed transmission of the passive optical subscriber network while minimizing the number of first optical cables. In addition, according to the present invention, the signal of the optical cable section can be digitized to avoid the speed degradation due to the up-noise in the conventional optical coaxial mixed network and the degradation of the signal performance, and the transmission speed according to the increase in subscribers per fiber node Can be solved by expanding the master card in the node master.

In addition, since the number of subscribers accommodated per optical port is connected in multiples of the number of subscribers linked to the coaxial transmission area, the price per subscriber of PON equipment is reduced by that, enabling a more economical network configuration and improving performance. Occurs.

In addition, according to the present invention, the field workability can be improved by placing a node master having a switching function as a subscriber dense area, compared to the conventional technology in which switching and transmission equipment exist only in broadcasting / communication offices. By randomly designing the number of cards, the number of connected subscribers per fiber node can be optimally designed for the site.

In addition, in the passive optical coaxial network of the present invention, the conventional BPON, EPON, GEPON, GPON, and WDMPON PON technology, and DOCSIS, PLC and MoCa coaxial transmission technology can be applied to include all.

Looking at the network configuration of the communication service providing system using a passive optical coaxial network according to the present invention shown in Figure 4, the first optical cable 440, the optical splitter 451, and the second optical cable 460 from the OLT (432) In the conventional passive optical subscriber network section consisting of ONT (473), the IEEE 802.3ah-based Gigabit Ethernet Passive Optical Network (GE-PON), G.983 (or G.984) -based Broadband Passive Optical Network Or Gigabit Capable Passive Optical Network (GPON) protocol, which not only enables high-speed data transmission, but also enables efficient optical cable usage and economical network maintenance. In addition, when various TON-based PON technologies such as 10Gbps EPON are applied in the future, network upgrade can be performed more easily.

In the present invention, the optical signal used for communication for providing Internet service and supplementary service uses a wavelength band of 1490 nm downlink and 1310 nm upward, and an optical signal used for broadcasting, and combines and separates two signals. Can be enabled.

At this time, the existing commercially available mass-produced WDM products capable of combining and separating the 1550 nm wavelength band and the (1310 nm + 1490 nm) wavelength band may be used as they are. That is, in order to combine and separate the wavelength band, and to construct the network more economically, when using an optical wavelength of 1310 nm band for broadcasting, it is possible to replace by a separate overlay module.

FIG. 7 illustrates a configuration of an overlay module that replaces the first WDM when the wavelength on which the broadcast signal is loaded is 1310 nm according to another embodiment of the present invention.

1550 nm / (1490 nm + 1310 nm) when the wavelength used in the passive optical section including the OLT 720 of the passive optical coaxial network and the ONT in the fiber node 760 is 1490 nm downward and 1310 nm upward, and the wavelength carrying the broadcast signal is 1310 nm. As shown in the figure, a passive optical coaxial network may be implemented with an overlay module 700 composed of a 1310 nm band optical circulator 730 and two 1310 nm / 1490 nm WDMs 740 and 750.

The second optical signal of the 1310 nm band carrying the broadcast signal in the OTX 710 is input to the first port of the optical circulator 730, then output to the second port, and is input to the 1310 nm port of the WDM 740, After output to the 1310nm / 1490nm common port, it is delivered to the fiber node 760.

In addition, the first optical signal for 1490 nm band data (communication) sent from the OLT 720 is input to the 1310 nm / 1490 nm common port of the WDM 750, and then outputs to the 1490 nm port, and the 1490 nm port of the WDM 740. Is inputted to the common port, and then is transmitted to the fiber node 760.

On the other hand, the 1310 nm wavelength band data (communication) optical signal transmitted from the fiber node 760 is input to the common port of the WDM 740 and separated into a 1310 nm port, and then port 2 of the optical circulator 730. It is input to the port 3 is output, and is input to the 1310nm port of the WDM (750) and then output to the common port is input to the OLT (720).

The overlay module 700 composed of the 1310 nm band optical circulator 730 and two 1310 nm / 1490 nm WDMs 740 and 750 is more complicated than the case of using an OTX using a 1550 nm wavelength band, but has a 1310 nm wavelength. By using the OTX 710 using the band, the price of the entire system can be lowered. In addition, by using the optical circulator 730 having the adjacent channel cancellation characteristic of 60dB or more, it is possible to minimize the interference of the second optical signal carrying the downlink broadcast signal to the data (communication) uplink signal of the same wavelength.

In addition, the master card in the node master and the modem on the subscriber side are DOCSIS (Data Over Cable Service Interface Specification) standard, standard of PLC modem operating within 1 to 40 MHz, or MoCA (Multimedia operating within 950 to 1500 MHz). Over Cable Alliance) can follow industry standards.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

As can be seen from the above description, according to the present invention, not only the advantage of the high-speed transmission of the passive optical subscriber network while minimizing the number of the first optical cable, but also infiltrate the node master as close as possible to subscribers at economical investment cost It is possible to provide a more effective broadcasting and telecommunications convergence service while increasing the transmission speed. That is, according to the present invention, by increasing the number of subscribers accommodated in expensive OLT equipment to optimize the unit cost per subscriber, and provides flexibility and expandability of the network through the expansion of the master card in the fiber node, In addition, by using a bandwidth of 30 MHz or more on the coaxial network to enable high-speed transmission of 200 Mbps or more.

In addition, according to the present invention, the field workability can be improved by placing a node master having a switching function as a subscriber dense area, compared to the conventional technology in which switching and transmission equipment exist only in broadcasting / communication offices. By randomly designing the number of cards, the number of connected subscribers per fiber node can be optimally designed for the site.

In addition, according to the present invention, the signal of the optical cable section through the digitization to avoid the degradation of the performance and the degradation of the signal due to the up noise in the conventional optical coaxial mixed network, and to reduce the transmission speed due to the increase of subscribers per fiber node This can be solved by extending the node master.

In addition, according to the present invention, by applying a pre-installed optical coaxial hybrid (HFC) network in the section from the broadcasting / telecommunications station to the passive optical distributor box, the optical cable is placed forward without additional laying of the existing optical fiber cable HFC network Enable cell division of.

In addition, according to the present invention, it is possible to provide a communication service providing system that can be applied to the existing BPON, EPON, GEPON, GPON, WDMPON, DOCSIS, PLC and MoCa technology as it is.

Claims (7)

Optical signal transmitting / receiving means in a broadcasting / communication station for transmitting an IP signal and a broadcasting signal through a first optical cable; Optical distribution means for distributing an IP signal and a broadcast signal received through the first optical cable to a fiber node through a second optical cable; A second optical signal obtained by all-optical conversion of the IP signal by a second WDM, and a second optical signal obtained by all-optical conversion of the broadcast signal, and photoelectric conversion of the separated first optical signal by an optical network terminal (ONT); Processing means in the fiber node for photoelectrically converting the separated second optical signal in a downlink optical receiver; And Coaxial signal transmission / reception means in the fiber node for inputting a coaxial signal generated in association with the first and second optical signals to an indoor terminal through a coaxial cable Including, The coaxial signal transmitting and receiving means, A node master generating a plurality of coaxial signals using the photoelectrically converted first optical signal; A down amplifier configured to generate a plurality of coaxial signals using the photoelectrically converted second optical signal; And A combiner for combining the generated coaxial signals and transmitting them to the indoor terminal through the coaxial cable Communication service providing system using a passive optical coaxial network comprising a. delete The method of claim 1, The optical signal transmission and reception means, An optical line terminal (OLT) for totally converting an IP signal received from an internet network and then converting the IP signal into a first optical signal; An optical transmitter (OTX) for all-optical converting the broadcast signal received from the broadcast network into a second optical signal; And A first WDM which combines the first optical signal and the second optical signal, which are optically converted, in a wavelength division scheme, and transmits the first optical signal through the first optical cable; Communication service providing system using a passive optical coaxial network comprising a. The method of claim 1, The light distribution means, System for providing a communication service using a passive optical coaxial network, characterized in that provided in the passive optical splitter box installed spaced apart from the broadcasting / communication station. delete delete delete

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