WO2015152569A1 - Method for synchronization communication in access network having g.hn technology applied thereto, and access network line concentration instrument, access network terminal and access network system using same - Google Patents

Abstract

The present invention relates to a method for synchronization communication in an access network having G.hn technology applied thereto, and an access network line concentration instrument, an access network terminal and an access network system using same, and comprises a line concentration instrument which comprises a control unit for controlling at least one of the speed and the output of a signal transmitted by a plurality of domain masters and the domain masters communicating with an access network terminal and which connects the domain masters with a G.hn standard physical layer. The present invention comprises the access network terminal which communicates with the domain masters and in which at least one of the speed and the output of a signal transmitted by the control unit is controlled. According to the present invention, by applying G.hn technology to an existing access network that uses a coaxial cable or a telephone line, efficient and high-bandwidth data transmission can be provided to a service subscriber and crosstalk can be reduced during the data transmission.

Description

동기화 ．Frequency communication method of access network to which ｈｎ technology is applied, access network concentrator, access network terminal, and access network system using the same

The present invention relates to a synchronization communication method of an access network to which G.hn technology is applied, a GAM of an access network, a terminal of a access network (GNT), and an access network system. Synchronizes communication between the domain master and the endpoint using a 20Hz to 60Hz clock generated by the GAM, and locks, holdovers, or free-run modes of operation between the GAMs. Synchronization communication method of access network with G.hn technology that implements clock synchronization that specifies Eve and synchronizes each terminal (GNT) with 40ms MAC cycle, and reduces crosstalk between bundle cables, and access network aggregation using the same An apparatus, an access network terminal, and an access network system.

G.hn is a Recommendation on ITU-G.9960 as a standard for the configuration and physical layer of wired-based home network transceivers. Referring to FIG. 1, in home networks according to the G.hn series of recommendations developed by the ITU-T, communication between domains is performed through a domain master. The domain master allocates and coordinates the resources (eg bandwidth, priority, etc.) of all nodes in the domain. The domain master can store and manage MAC addresses in the node registration process, have an authentication control function for joining nodes, and the domain master can monitor the status of nodes in the domain. In addition, a node belonging to a domain supports a subscription authentication control protocol, and may receive and perform other operations according to a medium access plan (MAP).

On the other hand, G.hn uses Power Line, Coaxial Cable, Unshielded Twisted Pair (UTP) Line, Phone Line, etc. as a single pair, but more than 1Pair bundle in access network ( Bundle). Therefore, G.hn (ITU-T 9960, 9961) technology, which is used for home network, can be applied to access network using existing coaxial cable or telephone line, so that maximum bandwidth can be provided up to 1Gbps.

Therefore, when the G.hn technology is applied to the access network, the central office (CO) and the terminal (Customer Premises Equipment, CPE) are connected by a bundle cable, and in this case, communication by crosstalk occurring on the bundle cable is difficult. This can happen. In addition, G.hn is a half duplex and best effort technology that cannot control the bandwidth of each port. There is a need for a technology that can set a separate bandwidth.

The present invention provides a method of synchronizing communication of an access network to which G.hn technology is applied to synchronize communication between a domain master and an endpoint to reduce crosstalk between bundle cables, an access network concentrator (GAM), and an access network using the same. Its purpose is to provide a terminal (GNT) and an access network system.

Another object of the present invention is to provide a maximum bandwidth of 1 Gbps by applying G.hn (ITU-T 9960, 9961) technology used for home networks to an access network using an existing coaxial cable or a telephone line. .

The present invention provides a method for removing near end crosstalk (NEXT) phenomenon in a bundle generated by applying G.hn technology to an access network using a synchronous clock signal. There is this.

According to a feature of the present invention for achieving the object as described above, the concentrator of the access network to which the G.hn standard of the present invention is applied, replaces the port as a set of G.hn node and the terminal of the access network (GNT And a switch connecting the domain master to communicate with the plurality of domain masters, and a domain master communicating with the G.hn standard, wherein the domain master is connected with an endpoint and a bundle cable to which the terminal GNT is replaced. In order to improve the crosstalk generated on the bundle cable, communication is synchronized at a preset frequency of 10 kHz or less.

According to another feature of the present invention, a terminal of an access network to which the G.hn standard of the present invention is applied is connected to a domain master, which is a set of G.hn nodes replacing a port of a concentrator, by a bundle cable, and connected to each domain master. One-to-one correspondence, synchronized synchronization at a preset frequency below 10 kHz, replaced by G.hn standard endpoints.

According to still another aspect of the present invention, an access network system to which the G.hn standard of the present invention is applied comprises: a plurality of concentrating devices designated as a master and a slave connected to each other through uplink and receiving synchronization signals; and A terminal of an access network that communicates according to a time frame assigned from each concentrator based on the synchronization signal, wherein the concentrator is a collection of G.hn nodes, replacing a port and communicating with a terminal of the access network. And a switch connecting a physical layer of a G.hn standard with a plurality of the domain masters, and connecting the domain master with a physical layer of a G.hn standard, wherein a terminal of the access network corresponds to the domain master one-to-one. The domain master and the endpoint are bundled. The blow-connected and a communication is synchronized with a predetermined frequency below 10kHz.

According to still another aspect of the present invention, in the method of synchronizing communication of an access network to which the G.hn technology of the present invention is applied, each domain master of the first concentrating device receives a synchronization signal from a clock controller, wherein the domain master is configured to perform the synchronization signal. Detecting a current time frame based on a synchronization signal, and transmitting a signal when the domain master matches the time frame indicated by its identifier.

According to the present invention, G.hn technology can be applied to an access network using a conventional coaxial cable or a telephone line to provide efficient data transmission with high bandwidth to a service subscriber, and can reduce crosstalk during data transmission.

1 is a configuration diagram schematically showing a configuration of a general G.hn standard.

2 is a block diagram of an access network to which the G.hn standard is applied according to an embodiment of the present invention.

3 is a graph illustrating a result of measuring a data transmission speed of a bundle cable according to a synchronous clock frequency according to the present invention.

4 is a block diagram illustrating a connection between a switch and a physical layer and a mixed configuration of a switch and a G.hn standard in an access network to which the G.hn standard according to the present invention is applied.

5 is a diagram illustrating a time frame transmitted and received by each domain master according to a synchronization signal according to the present invention.

6 is a flowchart illustrating an operation of a synchronization communication method of an access network to which the G.hn standard is applied according to another embodiment of the present invention.

7 is a flowchart illustrating a method of selecting an operation mode of a GAM in a synchronization communication method of an access network to which the G.hn standard is applied according to another embodiment of the present invention.

FIG. 8 is a diagram illustrating clock synchronization between a plurality of GAMs in an access network to which the G.hn standard according to the present invention is applied.

Hereinafter, a synchronization communication method of an access network to which the G.hn technology according to the present invention is applied, a GAM, an access network terminal (GNT), and an access network system of the access network using the same will be described in detail with reference to the accompanying drawings. Explain. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

The method and system for synchronizing communication of an access network according to the present invention include a GAM in which a plurality of ports perform a domain master function, and an end forming a G.hn domain with the domain master. Point (EP) can be implemented in a G.hn standard access network environment in which multiple terminals (GNT) with a bundled cable are connected.

2 is a block diagram of an access network to which the G.hn standard is applied according to an embodiment of the present invention. The access network is applicable to both an optical based access network and a telephone line DSL based access network depending on the connection medium. 2 illustrates a DSL access network based on a telephone line according to an embodiment.

As shown in FIG. 2, the G.hn standard is applied to an access network using a telephone line according to an embodiment of the present invention, and in order to provide a maximum bandwidth of 1 Gbps or more, the access network system of the G.hn standard is G.hn Access Multiplexer (or Concentrator) 100, with multiple ports acting as domain master, G.hn Network Terminal replaced by G.hn-compliant endpoint Or a terminal) 200, and a phone line connecting the domain master and the endpoint with a bundle cable 140.

Concentration equipment (GAM) 100 is a set of G.hn node to replace the port and communicate with the terminal (GNT) 200, the domain master 120, a plurality of domain master having a physical layer of G.hn standard ( The switch 110 may be connected to the 120, and the uplink 10 may be included. The uplink 10 may be installed inside or outside the GAM 100 to be connected to an optical line terminator (OLT) in the case of an FTTH-based access network, and an L3 aggregation switch in the case of a DSL-based access network. Can be connected.

The terminal (GNT) 200 is connected to the domain master 120, which is a set of G.hn nodes replacing the ports of the GAM 100, by a bundle cable, and is synchronized and communicated at a frequency of 10 kHz or less. Can be replaced with an endpoint in the G.hn specification. In order for the domain master 120 and the terminal (GNT) 200 to communicate with a bandwidth of 1 Gbps (Giga Bit Per Second), the frequency at which the domain master 120 and the terminal (GNT) 200 are synchronized must be 10 kHz or less. The frequency to be synchronized may be, for example, 20 Hz to 60 Hz (among them 25 Hz to 50 Hz).

As described above, the present invention is characterized in that clock synchronization is performed at a predetermined frequency in order to minimize G.hn interference. If the synchronous clock is not used, crosstalk between adjacent lines in the bundled cable access network may be mistaken as being the same line even though they are not the same line, thereby causing serious obstacles in providing access network services.

In order to reduce the interference between adjacent ports, if the signal transmission is scheduled by sending time according to the up / down direction, it does not interfere with the adjacent ports. However, the speed of the synchronous clock determines the data bandwidth that a port can use, and an infinitely long time cannot be used as a synchronous clock. The speed of the synchronous clock is more important for Giga service, and even more important for using copper to transfer the synchronous clock between devices.

Synchronous clocks of access network equipment using G.hn technology can use tens of Hz to tens of KHz. The graph of FIG. 3 shows a result of measuring a data rate in a bundle cable according to a synchronous clock frequency. The x-axis represents the data rate and the y-axis represents the synchronous clock. In other words, G.hn can no longer form a link and cannot send or receive data beyond the 10kHz band.

Therefore, in order to have the maximum performance used by G.hn in the present invention, a 25Hz to 200Hz band (among them, an optimal 25Hz to 50Hz) can be selected and used as a synchronous clock.

In this case, the GAM 100 is located at the network operator side, and the terminal GNT 200 is physically connected to the GAM 100 as a terminal device of the GAM 100. Can be located at the user, i.e., the service subscriber side. For example, the collecting equipment (GAM) 100 may be connected to the terminal (GNT) 200 by a telephone line. Concentration equipment (GAM) 100 is connected to the uplink (Uplink) 10, it may be configured to include a switch (110) and a plurality of ports (Port). The uplink 10 may be connected to an upper communication device, and a plurality of ports may be connected to one terminal (GNT) 200 through a telephone line and CPEV, F / S, TIV, and UTP.

At this time, in order to apply the G.hn technology to the access network composed of the GAM (100) and the terminal (GNT) 200, each port is to play the role of the domain master 120 of the G.hn standard It can be replaced by the domain master 120, and each terminal (GNT) 200 can be replaced by an endpoint to perform the role of the endpoint (End Point, EP) of the G.hn standard. As a result, the domain master 120 may form a G.hn domain on the network with the terminal (GNT) 200 replaced by a plurality of endpoints connected thereto.

4 is a block diagram illustrating a connection between a switch and a physical layer and a mixed configuration of a switch and a G.hn standard in an access network to which the G.hn standard according to the present invention is applied.

Referring to FIG. 4, a concentrator (GAM) 100 is connected to N domain masters DM and provides a synchronization signal 110, and N physical layers 300 connected to the switch 110 ( Physical layer, PHY 1 to PHY N), and N ports (Port 1 to Port N) may be configured to include a domain master (120).

At this time, the switch 110 may convert one 1GE (Gigabit Ethernet) or 10GE into a plurality of G.hn or 1GE. For example, the switch 110 may convert one 1GE (Gigabit Ethernet) or 10GE into 24 1GEs.

In addition, the switch 110 may be connected to one or more PHY, Octal PHY may use the SGMII or QSMII interface. Meanwhile, one PHY may be connected to a plurality of domain masters 120, for example, eight domain masters 120.

In addition, the domain master 120 may include a G.hn digital signal processor module (DSP) (not shown) and a G.hn analog front-end (not shown). . That is, the domain master 120 may be composed of a 1GE PHY, a G.hn digital signal processor (DSP), and a G.hn analog front-end (AFE). Preferably, the domain master 120 may be connected to the port to solve the crosstalk at the output port, the port may use a connector equivalent to the RJ45 connector.

Here, the domain master 120 is connected to the endpoint and the bundle cable, and may transmit a signal in synchronization with a frequency of 10kHz or less in order to prevent crosstalk generated on the bundle cable. In addition, the plurality of domain masters 120 may be given a unique identifier, and may be connected to an endpoint having the same identifier as the assigned identifier. In this case, the identifier may indicate one of time frames determined by the synchronization signal.

The present invention generates a synchronization clock in the GAM (100), and based on the clock control unit (GAM) 100 to implement the domain synchronization with each other or each terminal (GNT) (200) based on this 130). For example, the clock controller 130 may transmit a synchronization signal having a frequency of 10 kHz or less to each domain master 120, and the domain master 120 may determine a time frame determined by a unique identifier and a current synchronization signal. If the match is to communicate with the terminal (GNT) 200 associated with it. That is, the domain master 120 and the terminal (GNT) 200 may communicate in a time domain multiplexing (TDM) method.

5 is a diagram illustrating a time frame transmitted and received by each domain master according to a synchronization signal.

As shown in FIG. 5, when a synchronization signal of 50 Hz is transmitted to the domain master 120, the period of each synchronization signal is divided into a plurality of time frames. In the example of FIG. It is divided into time frames, and one or more domain masters 120 may transmit and receive in one time frame. Eight domain masters 120 are all connected to one switch 110. Therefore, eight domain masters are connected to one switch 110, and eight domain masters transmit and receive during two periods of a synchronization signal. To form a cycle.

As described above, in one embodiment of the present invention, the domain master 120 replaces each port of the GAM 100, and the GAM 100 replaces one 1GE or 10GE. It is possible to use a switch 110 that changes to 1GE. In this case, 24 ports may be provided in one concentrator (GAM) 100. Thus, up to 24 domain masters 120 exist for each concentrator (GAM) 100 and are connected to each terminal (GNT) 200. However, as described above, since the domain master 120 communicates with the terminal (GNT) 200 in a time division manner to prevent crosstalk, each domain master 120 is defined by a synchronization signal transmitted from the switch 110. Some of the MAC cycles are allocated to communicate. Therefore, each domain master 120 may be allocated one time frame as much as 1/24 of the MAC cycle in the worst case.

However, there is a limit in the time that the domain master 120 can transmit data to the terminal (GNT) 200 due to the limitation of the processing speed of the domain master 120 equipment, especially the G.hn DSP module (not shown). . Therefore, the time frame allocated to each domain master 120 should give a sufficient time for the domain master 120 to transmit and receive data to the terminal (GNT) 200, the time frame is the period of the synchronization signal Is determined by. Considering the performance of the current domain master 120 and the G.hn DSP module included therein, when using a synchronization signal of a period of 20Hz to 60Hz (particularly 25Hz to 50Hz), the domain master 120 equipment can transmit and receive data. In consideration of possible time and stability of transmission, transmission between domain master and terminal (GNT) 200 can be minimized.

In this case, referring to FIG. 8A, a plurality of first to third concentrators 100a, 100b, and 100c may be connected to each other as a master and a slave, and may operate in synchronization with each other while transmitting and receiving a synchronization signal. The synchronization signal may be transmitted to the slave, and the slave may operate by receiving the synchronization signal of the master. In this way, the operation of the entire access network can be stabilized by matching the synchronization signals of the various concentrating devices 100a, 100b, and 100c.

Here, the clock control unit 130 of the first concentrator 100a receives the synchronization signal from the second concentrator 100b and transmits it to the domain master 120, and the second concentrator 100b and the lock mode ( Lock Mode). That is, in this case, the second concentrator 100b serves as a master and the first concentrator 100a plays a role of a slave. At this time, while the first concentrator 100a is initialized, the clock controller 130 receives a synchronization signal of 20 Hz to 60 Hz from the second concentrator 100b which is a master, and receives the synchronization signal periodically from the master to receive 20 Hz. It operates in a lock mode operating in synchronization with a synchronization signal of 60 to 60 Hz. That is, in this case, the synchronization signal used when the first concentrator equipment 100a and the second concentrator equipment 100b communicate with the terminal GNT 200 is equal to 20 Hz to 60 Hz. Here, the second concentrator 100b generating the synchronous clock operates in a free run mode.

Referring to FIG. 8B, when the clock controller 130 of the first concentrator 100a cannot receive a synchronization signal from the second concentrator 100b at initialization, the first concentrator 100a is free. It operates in the free run mode to generate a synchronization signal based on an internal clock. That is, the free run mode does not operate according to a synchronization signal received from the outside, but refers to a state of operating according to a synchronization signal generated by the first concentrator 100a itself based on an internal clock.

In addition, the clock control unit 130 of the first concentrator 100a may transmit a synchronization signal to the third concentrator 100c and receive the synchronization signal while operating in the lock mode with the second concentrator 100b. If no, the device enters the hold over mode and transmits a synchronization signal generated based on an internal clock to the third concentrator 100c. That is, the third concentrator 100c operating as a slave using the first concentrator 100a as a master may be connected to the first concentrator 100a, in which case the first concentrator 100a is connected to the second concentrator. The synchronization signal received from the equipment 100b is transmitted to the third concentrator 100c so that the first to third concentrators 100a, 100b and 100c all operate in the lock mode according to the same synchronization signal of 20 Hz to 60 Hz. can do.

During the operation in the lock mode, for example, if the second concentrator 100b stops operating due to a malfunction or power loss of the second concentrator 100b, the first concentrator 100a may receive a synchronization signal from the master. In this case, the first concentrator 100a may operate in a holdover mode in which its slaves operate based on the synchronization signal generated by the first concentrator device 100a. In the holdover mode, the first concentrator 100a operates according to a synchronization signal generated by itself based on an internal clock, and the third concentrator 100c that is a slave of the first concentrator 100a is the first concentrator. The synchronization signal generated by 100a may be received and operated accordingly. The shift of clock synchronization between the master (second concentrator) and its slave (first concentrator or third concentrator) by operating in the holdover mode when the master or the second concentrator 100b malfunctions. This can minimize the number of GAMs in the network and ensure the maximum time for the entire network to operate normally.

At this time, in order for the first concentrator 100a and the terminal GNT 200 to communicate with each other, the domain identifier 120 and the terminal GNT 200 communicating with the same must be given the same identifier. Accordingly, different area identifiers may be assigned depending on whether the GAM 100 operates as a master or a slave, and whether the GAM 100 operates as a master and a slave as well as a master of different GAM 100. . In this case, when the GAM 100 operates as a master (for example, the first concentrator), the master identifier is operated by the slave only (eg, the third concentrator), and the second slave identifier is also different from each other. When operating as a master and a master (eg, the first collection equipment) of the GAM, the first slave identifier may be assigned.

For example, when the first concentrator 100a serves as a master, that is, the first concentrator 100a does not receive a sync signal from the second concentrator 100b, and the synchronization signal is transmitted to the third concentrator 100c. In the case of transmitting the first concentrator 100a, a specific master identifier may be given. When the first concentrator 100a is a master of different concentrators 100c and 100b and operates as a slave, that is, receives the synchronization signal from the second concentrator 100b and sends it to the third concentrator 100c. When transmitting the synchronization signal, the first concentrator 100a may be given a specific first slave identifier.

When the first concentrator 100a operates only as a slave, that is, when the first concentrator 100a receives the sync signal from the second concentrator 100b and does not transmit the sync signal to the third concentrator 100c, the first concentrator 100a is performed. May be given a particular second slave identifier. In this case, each identifier may be determined based on the area of the identifier assigned to the first concentrator 100a, and thus, the first concentrator 100a acting as a master and the first concentrator 100a acting as a slave may be determined. The identifiers given to may belong to different areas. That is, when the first concentrator 100a receives a master identifier, an identifier of the domain master of the first concentrator 100a is assigned in the first area, and the first concentrator 100a receives a first slave identifier. In this case, the identifier of the domain master of the first concentrating equipment 100a is assigned in the second area, and when the first concentrating equipment 100a is assigned the second slave identifier, the identifier of the domain master of the first concentrating equipment 100a is May be imparted in the third region. In this case, the first to third regions do not overlap each other, and accordingly, different identifiers may be assigned to the domain master in each case in which the first concentrator 100 operates as a master, a first slave, and a second slave.

If all concentrators 100a, 100b, 100c of the access network are assigned a master identifier, the master identifier is uniquely assigned to each concentrator (GAM), and all concentrators (GAM) of the access network are either first or first. When the 2 slave identifiers are given, the first or second slave identifiers may be uniquely assigned to each GAM. That is, when the domain masters of all the concentrators of the access network are assigned identifiers in the first region, the identifiers assigned in the first region are uniquely assigned to the respective concentrators, and all the concentrators in the access network. When the domain master of the equipment GAM is assigned an identifier in the second or third region, the identifier assigned in the second or third region is uniquely assigned to each concentrating equipment GAM. If the same master identifier or slave identifier is given from different concentrators (GAMs), a collision between identifiers assigned by different concentrators (GAMs) to the domain master 120 occurs, resulting in the domain master 120 and the terminal (GNT). Since there may be a problem that the connection between the 200 does not occur, all the concentrators (GAM) to act as a master or slave to prevent the collision of the identifier that the domain master 120 is granted by uniquely assigning each identifier. Can be.

Synchronization of the terminal (GNT) 200 in communication with the condensation equipment (GAM) 100 is distinguished from the synchronization between the condensing equipment (GAM) (100A, 100b, 100c) described above. At this time, the terminal (GNT) 200 that communicates with the GAM 100, the domain master 120 and the clock signal to communicate with each other without being synchronized, one period of frequency that the domain master 120 is synchronized Communication with the domain master may be performed on at least one of Transmission Opportunities (TXOPs) that are divided into a plurality. That is, the synchronization signals are transmitted to each other according to the master / slave relationship only between the GAM units 100a, 100b, and 100c, and the synchronization signals are exchanged between the domain master 120 and the terminal (GNT) 200. It doesn't work. Therefore, the domain master 120 and the terminal (GNT) 200 can communicate accurately using a technique such as handshaking, for example, without exchanging a synchronization signal.

At this time, the terminal (GNT) 200 and the domain master 120 may communicate through a protocol that can communicate with the domain master through the transmission opportunity. Such a protocol may include techniques such as handshaking described above in which the domain master 120 and the terminal (GNT) 200 can communicate without sending and receiving synchronization signals. An example of such a protocol may also be called a TXOP protocol.

For example, in the TXOP protocol, the G.hn network may access the media synchronously based on a structure in which the GAM 100 operates as a master and a slave to each other. In this case, the time period of the synchronized access may be referred to as a MAC cycle, and one MAC cycle may include a plurality of transmission opportunities and a media access plan (MAP). The domain master may periodically broadcast a MAP message containing allocation information of the next MAC cycle. Using MAP, the domain master can split the MAC cycle into multiple transmission opportunities, which can include contention free TXOP (CFTXOP) and shared transmission opportunities (Shared TXOP, STXOP). CFTXOP is used for Time Domain Multiple Access (TDMA) mode, and only one node can transmit to that TXOP, whereas STXOP is a connection defined between a group of nodes, token passing and carrier sensing multiplexing. Can be used for Carrier Sense Multiple Access (CSMA) mode.

At this time, each terminal (GNT) 200 dynamically optimizes at least one of bit loading and forward error correction (FEC), and performs at least one of bit loading and forward error correction within a time of 100 milliseconds or less. Can be done. That is, by performing bit loading and forward error correction within a very fast time of a few milliseconds, it is possible to reduce the rear crosstalk generated between the plurality of terminals (GNT) connected by the shared bundle cable.

In addition, a selective retransmission technique may be used to ensure that packet loss does not occur even in the event of crosstalk or noise occurring in the rear stage. In addition, the terminal (GNT) 200 may cope with noise and crosstalk by applying a buffer large enough to store a signal transmitted during a long noise situation of several tens of milliseconds. In addition, the terminal (GNT) 200 may implement the best performance even when there is a trailing crosstalk using a tool designed for G.hn neighbor network environments (NDIM).

6 is a flowchart illustrating an operation of a synchronization communication method of an access network to which G.hn technology is applied according to another embodiment of the present invention. A synchronization communication method of an access network to which G.hn technology is applied according to another embodiment of the present invention will be described with reference to this.

First, one of a master identifier, a first slave identifier, and a second slave identifier is assigned to the first concentrator 100a, and each domain master 120 of the identifier and the terminal (GNT) 200 connected thereto. The identifier is assigned (S110).

At this time, as described above, when the first concentrator 100a transmits the sync signal to the third concentrator 100c without receiving the sync signal from the second concentrator 100b, a specific master identifier is assigned. When receiving the synchronization signal from the second concentrator 100b and transmitting the synchronization signal to the third concentrator 100c, a specific first slave identifier is given, and the synchronization signal is received from the second concentrator 100b. When the third concentrator 100c does not transmit the synchronization signal, a specific second slave identifier is assigned, and the identifier assigned by the domain master 120 includes the above-described master identifier, first and slave identifiers, and second slave identifiers. It may be determined based on the given identifier.

In addition, when all GAMs in the access network are assigned a master identifier, the master identifier is uniquely assigned to each GAM, and the GAM assigns a first slave identifier or a second slave identifier. When received, the first and second identifiers may be uniquely assigned to each GAM.

Accordingly, when the same master identifier or slave identifier is given by different condensing equipments (GAM) and the identifier regions of different domain masters are allocated, collisions between identifiers assigned to domain masters 120 of different concentrating equipments (GAM) are obtained. This prevents the problem that the connection between the domain master 120 and the terminal (GNT) 200 does not occur, and the collision of the identifier by uniquely assigning each identifier when all the GAMs operate as masters or slaves. Can be prevented. The assignment of the identifier area and the identifier of the GAM may be performed at the initialization of the GAM or at the installation of the access network.

Subsequently, each domain master 120 of the first concentrator 100a receives the synchronization signal from the clock controller 130 (S120). In this case, the clock controller 130 may receive the synchronization signal from another concentrator 100b existing in the uplink 10 of the access network. In this case, the first concentrator 100a receiving the synchronization signal may be a slave. The second concentrator 100b operating as a master and transmitting a synchronization signal may operate as a master to operate in synchronization with each other. In this case, as described above, the synchronization signal may be a signal having a frequency of 10 kHz or less so as to reduce crosstalk in the bundle cable 140 and enable communication between the domain master 120 and the terminal (GNT) 200. have. In addition, the switch 110 may convert one 1GE or 10GE into a plurality of G.hn or 1GE, for example, 24 1GEs.

Subsequently, the domain master 120 detects the current time frame based on the synchronization signal (S130). That is, the domain master 120 may detect the current number of frames of time division frames divided by the synchronization signal. Subsequently, the domain master 120 compares the current time frame detected by the time frame indicated by its identifier with the current time frame detected by the domain master 120, that is, the current time frame corresponds to the time frame indicated by its identifier. It is determined whether the frame can communicate with the GNT 200 (S140). If it is determined in step S140 that the current time frame and its identifier do not match, the current time frame is not a frame that the corresponding domain master 120 can communicate with the terminal GNT 200. 120 repeats steps S120 to S140 and waits for a time frame that matches its identifier.

If it is determined in step S140 that the current time frame and the time frame indicated by the identifier thereof coincide, the process proceeds to step S150 to perform communication between the domain master 120 and the terminal (GNT) 200. . At this time, the domain master 120 transmits a signal to the terminal (GNT) 200 in the first half of the current time frame as described above (S150). In addition, the domain master 120 receives a signal from the terminal (GNT) 200 in the second half of the current time frame (S160) and terminates the process to perform communication with the terminal (GNT) 200. That is, the domain master 120 may transmit a signal when the current time frame matches its identifier.

7 is a flowchart illustrating a method of selecting an operation mode of a GAM in a synchronization communication method of an access network to which the G.hn standard is applied according to another embodiment of the present invention, and FIG. 7 is a G according to the present invention. A diagram illustrating clock synchronization between a plurality of GAMs in an access network to which the .hn standard is applied.

Referring to FIG. 7, as described above, the plurality of concentrators GAM 100a, 100b, and 100c may operate as masters and slaves, and may transmit and receive synchronization signals to operate in synchronization with each other. In FIG. 8, a GAM 100 that operates as one slave is connected to a GAM 100 that operates as one master, but operates as one master according to an implementation. The GAM 100 may be connected to a GAM 100 that operates as a plurality of slaves, and the GAM 100 that operates as a slave may be separately collected to operate as a slave. GAM) may be connected in singular or plural. According to the exemplary embodiment, the number of the GAM 100 that transmits and receives the synchronization signal may vary. For example, seven GAM 100 may transmit and receive the synchronization signal and operate as a master and a slave. Can be.

As shown in FIG. 7, when the GAM 100 is initialized, the first collecting device 100a first determines whether a synchronization signal can be received from the second collecting device 100b (S210). . If the synchronization signal can be received, the first concentrator 100a enters the lock mode with the second concentrator 100b and operates according to the synchronization signal received from the second concentrator 100b. If the synchronization signal cannot be received from the second concentrator 100b, the first concentrator 100a enters a free run mode that generates the synchronization signal based on the internal clock (S230) and ends the process. For example, when the second concentrator 100b shown in FIG. 8A selects an operation mode according to the process shown in FIG. 7, since the second concentrator 100b does not receive a synchronization signal from another concentrator GAM at initialization, It enters the free run mode and operates.

While the first concentrator 100a operates in the lock mode, the first concentrator 100a determines whether it is possible to receive a synchronization signal from the second concentrator 100b (S240). If the first concentrator 100a operates as a slave to the second concentrator 100b and acts as a master for the third concentrator 100c, the first concentrator 100a is the third concentrator 100c. A synchronization signal can be sent to the. For example, in the example illustrated in FIG. 8A, the first concentrator 100a may operate in the lock mode with the second concentrator 100b to receive a synchronization signal received from the second concentrator 100b in a third manner. It transmits to the concentrating equipment 100c, and the third concentrating equipment 100c operates in the lock mode with the second concentrating equipment 100b.

If it is determined in step S240 that the synchronization signal reception is impossible, that is, when the synchronization signal cannot be received from the second concentrator 100b while operating in the lock mode, the first concentrator 100a may hold over. In operation S250, a synchronization signal generated based on an internal clock may be transmitted to the third concentrator 100c. For example, when the power of the second concentrator 100b is turned off in the example shown in FIG. 8A, as shown in FIG. 8B, the first concentrator 100a includes the second concentrator ( Since the synchronization signal cannot be received from 100b), the device enters the holdover mode, and in the holdover mode, the synchronization signal is generated according to the synchronization signal generated based on the internal clock. The third concentrator 100c, which is a slave of the controller, is transmitted.

If the synchronization signal can be received in step S240, the first concentrator 100a may continue to operate in the lock mode by repeating step S220.

The shift of clock synchronization between the master (second concentrator) and its slave (first concentrator or third concentrator) by operating in the holdover mode when the master or the second concentrator 100b malfunctions. This can minimize the number of GAMs in the network and ensure the maximum time for the entire network to operate normally.

As described above, according to the present invention, G.hn technology can be applied to an access network using a conventional coaxial cable or a telephone line to provide efficient data transmission to a service subscriber with high bandwidth, and reduce crosstalk during data transmission. You can.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand. Therefore, the technical protection scope of the present invention will be defined by the claims below.

Claims (42)

A domain master that replaces a port as a collection of G.hn nodes and communicates with a terminal (GNT) of an access network; And It includes a switch for connecting a physical layer of the G.hn standard and a plurality of the domain master, The domain master is connected to the endpoint that the terminal (GNT) is replaced by a bundle cable and the G.hn characterized in that the synchronous communication at a predetermined frequency of less than 10kHz to improve crosstalk generated on the bundle cable Concentration equipment for access networks to which the standard applies. The method of claim 1, The switch converts one 1GE or 10GE into a plurality of G.hn or 1GE, so that one switch is connected to 8 to 24 domain masters. Concentrating equipment. The method of claim 1, The domain master concentrator of the access network to which the G.hn standard is applied, characterized in that it comprises a G.hn digital signal processing module and a G.hn analog front end. The method of claim 1, The plurality of domain masters are each given a unique identifier, and the aggregation equipment of the access network to which the G.hn standard is applied, characterized in that connected to the endpoint having the same identifier as the given identifier. The method of claim 4, wherein The condensing equipment includes first to third concentrating equipment connected through an uplink, When the first concentrating device transmits the synchronizing signal to the third concentrating device without receiving the synchronizing signal from the second concentrating device, the identifier is assigned in the first area, When the synchronization signal is received from the second concentrator and the synchronization signal is transmitted to the third concentrator, the identifier is assigned in the second area. The identifier is assigned in the third area when receiving the synchronization signal from the second concentrator and not transmitting the sync signal to the third concentrator. Concentration equipment of an access network to which the G.hn standard is applied, wherein the first to third regions do not overlap each other. The method of claim 5, When the domain masters of all the concentrating devices of the access network are assigned identifiers in the first area, the identifiers assigned in the first area are uniquely assigned to each concentrating device, and the domain masters of all the concentrating devices in the access network. When the identifier is assigned in the second or third region, the identifier assigned in the second or third region is uniquely assigned to each concentrating equipment. equipment. The method of claim 1, The condensing equipment is composed of first to third concentrating equipment connected through an uplink, The first concentrator receives the synchronization signal from the second concentrator and transmits the synchronization signal to the domain master, and further includes a clock controller configured to operate in a lock mode with the second concentrator. Concentrator equipment. The method of claim 7, wherein The clock controller transmits the synchronization signal to a third concentrator and enters a holdover mode to the third concentrator if the synchronization signal cannot be received from the second concentrator while operating in the lock mode. Convergence equipment of an access network to which the G.hn standard is applied, characterized in that to transmit a synchronization signal generated based on an internal clock. The method of claim 7, wherein When the clock controller cannot initialize the synchronization signal from the second concentrator during initialization, the clock controller operates in a free run mode to generate the synchronization signal based on an internal clock. Concentrator equipment. It is connected by bundle cable with domain master, which is a set of G.hn node that replaces the port of concentrator equipment, correspond with each domain master in one-to-one correspondence, communicates with synchronization at predetermined frequency below 10kHz, and replaces with G.hn standard endpoint. The terminal of the access network to which the G.hn standard is applied. The method of claim 10, The domain master is included in the concentrator, and the concentrator includes a switch for connecting a physical layer of the G.hn standard with a plurality of domain masters and converting one 1G or 10GE into a plurality of G.hn or 1GE. A terminal of an access network to which the G.hn standard is applied. The method of claim 10, The domain master terminal of the access network to which the G.hn standard is applied, characterized in that it comprises a G.hn digital signal processing module and a G.hn analog front end. The method of claim 11, The domain master is assigned a unique identifier, each terminal of the access network to which the G.hn standard is applied, characterized in that connected with the endpoint having the same identifier as the given identifier. The method of claim 10, The endpoint communicates with the domain master in synchronization without sending and receiving clock signals, The endpoint is applied to the G.hn standard characterized in that the domain master communicates through a protocol that can communicate with the domain master on at least one of the transmission opportunities divided into a plurality of periods of the synchronized frequency Terminal of an access network. The method of claim 10, At least one of dynamic optimization and selective retransmission of at least one of bit loading and forward error correction, wherein at least one of the bit loading and forward error correction is performed within 100 milliseconds or less. Terminal. A plurality of concentrators which are interconnected through uplinks and are designated as masters and slaves for transmitting and receiving synchronization signals; And A terminal of an access network communicating by a time frame allocated based on the synchronization signal from each concentrating device, The concentrating device includes a switch that connects a port as a set of G.hn nodes and communicates with a terminal of the access network and a physical layer of a G.hn standard to a plurality of the domain masters. Connects the physical layer of G.hn standard, The terminal of the access network is replaced with an endpoint of the G.hn standard corresponding one-to-one with the domain master, The domain master and the endpoint is connected to the bundle cable and the access network system to which the G.hn standard is applied, characterized in that the communication is synchronized at a predetermined frequency of less than 10kHz. The method of claim 18, The switch is an access network system to which the G.hn standard is applied, characterized in that converting one 1GE or 10GE to a plurality of G.hn or 1GE. The method of claim 16, The domain master includes a G.hn digital signal processing module and a G.hn analog front end. Access network system to which the G.hn standard is applied. The method of claim 16, And the plurality of domain masters are each assigned a unique identifier and are connected to the endpoint having the same identifier as the granted identifier. The method of claim 19, The plurality of concentrators include first to third concentrators, The first collecting equipment, When the synchronization signal is transmitted to the third collection equipment without receiving the synchronization signal from the second collection equipment, the identifier is assigned in the first area, When the synchronization signal is received from the second concentrator and the synchronization signal is transmitted to the third concentrator, the identifier is assigned in the second area. The identifier is assigned in the third area when receiving the synchronization signal from the second concentrator and not transmitting the sync signal to the third concentrator. Access network system to which the G.hn standard is applied, characterized in that the first to third areas do not overlap each other. The method of claim 20, When the domain masters of all the concentrating devices of the access network are assigned identifiers in the first area, the identifiers assigned in the first area are uniquely assigned to each concentrating device, and all the concentrating devices of the access network are assigned to the first master. When an identifier is assigned in the first or third region, the identifier given in the second or third region is uniquely assigned to each concentrator. The access network system to which the G.hn standard is applied. The method of claim 16, The first concentrator equipment receives a synchronization signal from the second concentrator equipment and transmits the synchronization signal to the domain master, and further comprising a clock control unit for operating in the lock mode with the second concentrator equipment. Access network system to which the .hn standard applies. The method of claim 22, The clock controller transmits the synchronization signal to a third concentrator and enters a holdover mode to the third concentrator if the synchronization signal cannot be received from the second concentrator while operating in the lock mode. An access network system to which the G.hn standard is applied, characterized by transmitting a synchronization signal generated based on an internal clock. The method of claim 22, If the clock control unit is unable to receive the synchronization signal from the second concentrator during initialization, the clock controller operates in a free run mode to generate the synchronization signal based on an internal clock. . Receiving, by each domain master of the first concentrating equipment, a synchronization signal from a clock controller; Sensing, by the domain master, a current time frame based on the synchronization signal; And And transmitting, by the domain master, a signal when the current time frame matches a time frame indicated by its identifier. The method of claim 25, The synchronization signal is a synchronization communication method of an access network to which the G.hn standard is applied, characterized in that the signal of a frequency of 10kHz or less. The method of claim 25, And the switch converts one 1GE or 10GE into a plurality of G.hn or 1GE. The method of claim 25, And receiving the synchronization signal from the second concentrator and entering a lock mode with the second concentrator when the first concentrator is initialized. The method of claim 28, The first concentrator transmits the synchronization signal to a third concentrator, and enters a holdover mode when the third concentrator cannot receive the synchronization signal from the second concentrator while operating in the lock mode. A synchronization communication method of an access network to which the G.hn standard is applied, characterized in that to transmit a synchronization signal generated based on an internal clock to a device. The method of claim 25, And when the first concentrator is unable to receive the sync signal from the second concentrator at initialization, entering the free run mode generating a sync signal based on an internal clock. Synchronous communication method in an access network to which the specification applies. The method of claim 25, The first concentrator, When the synchronization signal is transmitted to the third concentrator without receiving the synchronization signal from the second concentrator, the identifier of each domain master is assigned in the first region. When receiving a synchronization signal from the second concentrator and transmitting the sync signal to the third concentrator, an identifier of each domain master is assigned in the second region. When the synchronization signal is received from the second concentrator and the synchronization signal is not transmitted to the third concentrator, an identifier of each domain master is assigned in the third region. And the first to third regions do not overlap each other. The method of claim 29, When the domain masters of all the concentrating devices of the access network are assigned identifiers in the first area, the identifiers assigned in the first area are uniquely assigned to each concentrating device, and the domain masters of all the concentrating devices in the access network. Is assigned an identifier in the second or third region, the identifier assigned in the second or third region is uniquely assigned to each concentrator equipment. Communication method. The present invention relates to a network access device for applying G.hn technology in an access network. One or more concentrators having a plurality of ports; And It consists of a plurality of terminals connected to the concentrator equipment and an access network, Each port of the concentrator is replaced with a domain master that is a collection of nodes to be applied to G.hn technology, the terminal is replaced with an endpoint to be applied to G.hn technology, and the domain master is bundled with the endpoint. Connected by cable, Access network system to which the G.hn standard is applied, characterized in that for transmitting a signal in synchronization with 20Hz to 60Hz synchronization to prevent crosstalk generated on the bundle cable. The method of claim 33, The collecting equipment is, Concentrator switch, At least one physical layer (PHY) connected to the aggregation switch; Access network system to which the G.hn standard is applied, characterized in that it comprises a plurality of domain master connected to the PHY. The method of claim 33, The domain master is an access network system to which the G.hn standard is applied, characterized in that it is composed of a PHY, a G.hn DSP module, and a G.hn AFE. The method of claim 33, The condensing equipment is an access network system to which the G.hn standard is applied, characterized in that it comprises a switch for converting one 1GE or 10GE to 24 1GE. The method of claim 33, The domain master has each seed value and is connected to an EP having the same seed value as the seed value. As a method for applying G.hn technology in an access network between at least one concentrator having multiple ports and multiple terminals, Generating, by the collecting equipment, a synchronous clock signal; Dividing the generated synchronous clock signal into a plurality of transmissions and receptions on a time axis; And And packetizing data including the separated synchronous clock signal in one time frame and transmitting the packetized data to the terminal. The method of claim 38, Each port of the concentrator is replaced with a domain master, which is a collection of nodes to be applied to G.hn technology, and the terminal is replaced with an endpoint to be applied to G.hn technology. . The method of claim 38, The synchronization clock signal is a 20Hz to 60Hz frequency signal, characterized in that the synchronization communication method of the access network. The method of claim 38, If there are two or more concentrating devices, the master communication device and the slave concentrating device by using a synchronous clock between the plurality of concentrating devices, characterized in that the synchronization communication method of the access network. 42. The method of claim 41 wherein In order to reduce the delay time (Delay time) occurring in the data transmission process between the multiple concentrators, the connection between the concentrators is connected by a physical means including an RF cable.

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