KR20080050257A - Method and Device for Matching Voice Telephone Subscribers in Optical Network - Google Patents

Abstract

In order to match a plurality of voice terminals and a plurality of packet terminals to an optical communication network, the POTS subscriber matching apparatus converts analog signals of the plurality of voice terminals into a plurality of digital signals, respectively, and determines whether each of the plurality of voice terminals is activated. Inserting state information, including the state information, into an optical communication frame for a voice service, inserting a digital signal of an activated voice terminal among a plurality of digital signals into an optical communication frame for a voice service, The optical communication frame of the packet terminal is multiplexed and transmitted to the optical line.

Description

Method and apparatus for matching voice telephone subscriber in optical network

The present invention relates to a voice telephone subscriber matching method and apparatus in an optical network.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-401-02, Title: High-speed Optical Subscriber Network Technology Development] ].

As the FTTH network becomes widespread, the optical paths are extended to the subscriber's premises and the optical network terminal (ONT) of the Gigabit Passive Optical Network (GPON) is located in the premises. Optical network terminators require features for plain old telephone service (POTS) for general subscribers as well as Ethernet subscriber matching for data communications. There are two methods of providing a TDM service to an existing data network. An E1 / T1 trunk is provided in an IP network and a channel mapping method between TDM and packets. These methods provide E1 / T1 to transmit T1 / E1 trunk data to an IP network. It is a method of packetizing data and transferring data to a high-speed IP network instead of PSTN. This method can provide Pseudo wire edge-to-edge emulation for the E1 / T1 trunk over the IP network.

However, when the number of POTS subscribers accommodated by the optical network termination device of the gigabit-passive optical network is small and the usage period is not long, there is a problem of wasting network resources. For example, if one POTS is matched to one optical network terminator, 64 kbps is required. In this case, there is no need to use network resources when not making a telephone call. Therefore, there is a need for a frame structure that delivers necessary control signals and data, and an efficient control method and apparatus.

The technical problem to be achieved by the present invention is to efficiently provide the POTS provided by the existing local exchange to the FTTH network.

In order to solve this problem, according to a feature of the present invention, a method of matching a plurality of voice terminals and a plurality of packet terminals to an optical communication network is provided. The method may further include converting analog signals of the plurality of voice terminals into a plurality of digital signals, inserting state information including whether each of the plurality of voice terminals is activated into an optical communication frame for voice service; Inserting a digital signal of an activated voice terminal among the plurality of digital signals into an optical communication frame for the voice service, multiplexing an optical communication frame for the voice service and an optical communication frame of the plurality of packet terminals Sending to.

According to another aspect of the present invention, an apparatus for matching a plurality of voice terminals and a plurality of packet terminals to an optical communication network is provided. The apparatus inserts codecs for converting analog signals of the plurality of voice terminals into a plurality of digital signals, and state information including whether each of the plurality of voice terminals is activated in an optical communication frame for voice service. GEM frame allocation unit for inserting the digital signal of the activated voice terminal of the plurality of digital signals into the optical communication frame for the voice service, multiplexing the optical communication frame for the voice service and the optical communication frame of the plurality of packet terminals And a medium control unit for transmitting to the optical line.

According to another feature of the present invention, there is provided an optical line termination device connected to a plurality of optical network termination devices and connected to a public telephone network and the Internet. The optical line termination device receives the optical communication frame from the optical network termination device and according to the port identifier of the header of the optical communication frame, the first optical communication frame for the plurality of voice terminals and the second optical for the plurality of packet terminals. A media control unit for dividing a communication frame, a demultiplexer for demultiplexing the first optical communication frame for each of the plurality of voice terminals to generate a demultiplexed optical communication frame, and converting the demultiplexed optical communication frame into And an optical communication / voice communication conversion unit that separates the status information and the voice signal and loads the voice signal in the time slot of the first voice communication line.

According to another aspect of the present invention, there is provided an optical communication frame generation method for a voice service for matching a plurality of voice terminals and packet terminals to an optical communication network. The method includes inserting data of the plurality of voice terminals into an optical communication frame for the voice service, data length of data of the plurality of voice terminals and the number of the plurality of voice terminals. Inserting into a communication frame, inserting a control signal comprising an active or inactive state of each of the plurality of voice terminals into an optical communication frame for the voice service.

According to an embodiment of the present invention, a GPON POTS matching device accommodates a plurality of POTS subscriber stations at an optical network termination device located at a subscriber side of a GPON, and provides existing telephone service to a GPON to provide an existing telephone service subscriber network. By unifying FTTH subscriber network, it is possible to reduce network installation and operation cost and to provide existing telephone service through FTTH network.

In addition, only the data of the active POTS subscriber station can be used to efficiently use network resources.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

A method and apparatus for POTS subscriber matching in a gigabit-passive optical network according to an embodiment of the present invention will now be described in detail with reference to the drawings.

1 is a diagram schematically illustrating a gigabit-passive optical network for accommodating a POTS subscriber station according to an embodiment of the present invention.

As shown in FIG. 1, a gigabit-passive optical network for accommodating POTS subscribers includes an optical network terminator 100, an optical line terminator 200, a distributor 300, a POTS subscriber terminal 400, Interworking with the Ethernet subscriber station 500, the public telephone network 600 and the Internet 700.

The optical network terminator 100 includes a GPON media controller 120 and a POTS matching unit 110, and the optical line terminator 200 includes a plurality of GPON media controllers 210, a GPON TDM switch 220, and an Ethernet. Switch 230.

The optical network terminator 100 is connected to a plurality of Ethernet subscriber stations 500 and a plurality of POTS subscriber stations 400 to mate the Ethernet subscriber stations 500 and the POTS subscriber stations 400 and to connect the distributor 300. It is connected with the optical line termination device 200 through. The POTS matching unit 110 of the optical network terminator 100 matches a plurality of POTS subscriber stations 400, and each of the TDM data, the call control signal information, and the POTS subscriber stations 400 of the POTS subscriber stations 400. State information including whether to activate is transmitted to the GPON media controller 120 in a G-PON Encapsulation Method (GEM) frame. The GPON media controller 120 performs a matching with the Ethernet subscriber station 500, a matching with the POTS matching unit 110, and a matching with the GPON link.

The optical line terminator 200 is connected to a distributor 300 connected to the optical network terminator 100. The GPON media control unit 210 of the optical line termination unit 200 matches with the GPON link, receives the GEM frame from the plurality of optical network termination units 100, and among the received GEM frames, the Ethernet frame is connected to the Internet through an Ethernet switch. And transmits the TDM data to the GPON TDM switch 220 in the GEM frame. The GPON TDM switch 220 receives the GEM frame from the GPON media controller 210, receives the TDM data, and matches the local switch of the public telephone network 600 through the V5.2 interface. Here, POTS means a voice terminal for voice service, and TDM data is a signal obtained by converting data of POTS into a digital signal.

Next, a method and an optical network terminator for matching a POTS subscriber station and an Ethernet subscriber station according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

2 is a flowchart schematically illustrating a method for registering a POTS subscriber station and an Ethernet subscriber station using an optical network termination device according to an embodiment of the present invention.

As shown in FIG. 2, the optical network terminator receives analog signals from a plurality of POTS subscriber stations, converts the received analog signals into digital signals (S110), and activates each of the plurality of POTS subscriber stations. The state information and the call control signal information including the is inserted into the payload of the GEM frame of the POTS subscriber station (S120). Thereafter, the optical network terminator inserts the digital signal of the activated POTS subscriber station into the payload of the GEM frame of the POTS subscriber station (S130), and inserts the port identifier and the call control signal information into the header of the GEM frame. Insert (S140). Finally, the optical network terminator multiplexes the GEM frames of the plurality of POTS subscriber stations and the GEM frames of the plurality of Ethernet subscriber stations and transmits them to the optical line (S150).

3 is a block diagram schematically illustrating an optical network terminator for matching a POTS subscriber station and an Ethernet subscriber station according to an embodiment of the present invention.

As shown in FIG. 3, the optical network termination device 100 includes a POTS matching unit 110 and a GPON media control unit 120.

The POTS matching unit 110 of the optical network terminator 100 includes a signal device 111, a subscriber line interface circuit (SLIC) 112, a coder / decoder 113, and a TDM buffer ( 114, a GEM frame allocation unit 115, a phase locked loop 116, a main processor unit 117, and a header table 118.

The signal device 111 of the POTS matching unit 110 generates a call signal for calling a POTS subscriber station under the control of the main processor unit 117 and supplies a call signal to the POTS subscriber station.

The subscriber line interface circuit 112 supplies power required for the POTS subscriber station and transmits and receives signals between the POTS subscriber station and the optical network termination device 100.

The codec 113 receives an analog signal, which is a voice signal from the subscriber line interface circuit 112, and converts it into TDM data, which is a digital signal, using a Pulse Code Modulation (PCM) method, and conversely, converts TDM data into an analog signal. Here, the TDM data is a signal obtained by converting data of the POTS subscriber station into a digital signal.

The TDM buffer 114 temporarily stores the TDM data received from the codec 130.

The GEM frame generation unit 115 assigns TDM data temporarily stored in one or more TDM buffers 114 and state information including whether the POTS subscriber station is activated to the payload of the GEM frame, and from the header table 118. The port identifier and the call control signal information are received and inserted into the header of the GEM frame and transmitted to the optical line terminator 200 through the GPON media controller 120.

The phase lock loop 116 generates a synchronization clock according to a synchronization packet periodically received from the optical line termination device 200 to provide clock synchronization to each module of the POTS matching unit 110. The main processor unit 117 controls the operation of each module of the POTS matching unit 110. The header table 118 manages port identifiers and call control signal information to be assigned to the header of the GEM frame.

The GPON media control unit 120 of the optical network terminator 100 multiplexes the GEM frame of the POTS subscriber station and the GEM frame of the Ethernet subscriber station and transmits the multiplexed GEM frame of the POTS subscriber station to the optical line terminator 200 through the distributor 300.

4 is a flowchart schematically illustrating a matching method of a POTS subscriber station of an optical line terminator according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the optical line termination device distinguishes the GEM frame of the POTS subscriber station from the GEM frame of the Ethernet subscriber station according to a port identifier included in the header of the GEM frame among the GEM frames received from the optical network termination device. (S210). The optical line termination device demultiplexes a GEM frame of a POTS subscriber station among a plurality of POTS subscriber stations among the divided GEM frames, and delivers the same to a plurality of corresponding GEM / E1 conversion units. To pass on.

Thereafter, the data of the POTS subscriber station included in the GEM frame of the POTS subscriber station is separated from the call control signal information and the state information (S220), and the digital signal of the POTS subscriber station is multiplexed by TDM to make a voice communication line such as E1 link. Through the transfer to the local exchange of the public telephone network (S230). The call control signal information and state information are transmitted to the table manager.

5 is a block diagram schematically illustrating a TDM switch of an optical line terminator according to an embodiment of the present invention.

As shown in FIG. 5, the TDM switch 220 of the optical line terminator 200 includes a multiplexing and demultiplexing unit (Mux / Demux) 221, a GEM / E1 converter 222, and a time slot switch 223. ), A link matching unit 224, a phase locked loop 225, a protocol control unit 226, and a table management unit 227.

The multiplexing and demultiplexing unit 221 of the TDM switch 220 receives the GEM frame of the POTS subscriber station from the GPON media control unit 210 of the optical line terminator 200 and transmits a plurality of POTS subscribers according to the state information of the GEM frame. The terminal multiplexes by terminal and transmits the demultiplexed to the plurality of GEM / E1 converters 222. On the contrary, the GEM frame received from the GEM / E1 converter 222 is multiplexed and transferred to the GPON media controller.

The GEM / E1 conversion unit 222 receives the GEM frame of the POTS subscriber station from the multiplexing and demultiplexing unit 221 and separates data of the POTS subscriber station included in the GEM frame from the call control signal information and the state information to the POTS subscriber. The data of the terminal is delivered to a time slot switch 223 in a given time slot of a voice communication line such as an E1 link, and call control signal information and status information are transmitted to the table manager 227.

The table manager 227 manages GEM header information of the GEM frame, state information of each of the plurality of POTS subscriber stations, and call control signal information.

The time slot switch 223 receives the time slots from the plurality of GEM / E1 converters 222, sets a line according to a voice communication line corresponding to the time slots, and outputs the time slots to the link matching unit 224.

The link matching unit 224 matches the local exchange and transmits the time slot received from the time slot switch 223 to the public telephone network through the local exchange.

Phase locked loop 225 is coupled to link matcher 224 to provide clock synchronization to link matcher 224, and signal device 228 is coupled to time slot switch 223 to generate its own required signal. The protocol controller 226 is connected to the time slot switch 223 and the table manager 227 to provide call control signal information and a protocol for V5.2 matching.

6 is a diagram schematically showing a GEM frame of a POTS subscriber station according to an embodiment of the present invention.

As shown in FIG. 6, the GEM frame of the POTS subscriber station includes a GEM header 810 and a GEM payload 820, and the GEM payload 820 includes a TDM header 821 and TDM data 822. Include.

The GEM header 810 includes a PLI, a port identifier, a PTI, and an HEC. The payload length indicator (PLI) of the GEM header 810 indicates the length of the payload, and the port identifier is used to distinguish the traffic to provide traffic multiplexing between the POTS subscriber station and the Ethernet subscriber station, and the payload type indicator. ) Defines the payload type, and HEC (Header Error Control) performs error detection and correction of the GEM frame header.

The TDM header 821 includes status information and call control signal information for the POTS subscriber station, and the status information includes the number of POTS subscriber stations multiplexed in the GEM frame, the data length of the POTS subscriber station, and the respective control of the POTS subscriber station. Contains a signal. Here, each control signal of the POTS subscriber station includes information indicating an active or inactive state, and if the control signal of the POTS subscriber station is active, POTS data of the corresponding terminal is inserted, and if the control signal of the POTS subscriber station is inactive, POTS of the corresponding terminal Do not insert data. In addition, when the control signals of all the POTS subscriber stations are inactive, the corresponding GEM frame is not generated in order to prevent the unused POTS subscriber stations from using network resources.

TDM data 822 includes data of each of the POTS subscriber terminals.

FIG. 7 is a diagram schematically showing information included in a table manager of a GPON TDM switch of an optical line terminator according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the table management unit (227 of FIG. 3) of the GPON TDM switch of the optical line termination device is configured for each GPON link, and each table management unit is a port identifier, a link number, and the number of POTS subscriber stations. , Time slot location, RX message and TX message.

The port identifier indicates the port of the GEM header, the link number indicates the E1 link number connected to the time slot switch, the number of POTS subscriber stations indicates the number of POTS subscriber stations allocated to the corresponding GEM frame, and the time slot position is E1. Represents a location of a time slot allocated to a link. The RX message and the TX message are inserted into the TDM header (821 of FIG. 4) of the GEM frame as call control signal information to be transmitted and received with the POTS matching unit (110 of FIG. 2) of the optical network terminator.

Embodiments of the present invention are not implemented only through the above-described apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention, a recording medium on which the program is recorded, and the like. Such implementations may be readily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram schematically illustrating a gigabit-passive optical network for accommodating a POTS subscriber station according to an embodiment of the present invention.

2 is a flowchart schematically illustrating a method for registering a POTS subscriber station and an Ethernet subscriber station using an optical network termination device according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an optical network terminator for matching a POTS subscriber station and an Ethernet subscriber station according to an embodiment of the present invention.

4 is a flowchart schematically illustrating a matching method of a POTS subscriber station of an optical line terminator according to an exemplary embodiment of the present invention.

5 is a block diagram schematically illustrating a TDM switch of an optical line terminator according to an embodiment of the present invention.

6 is a diagram schematically illustrating a GEM frame of a POTS subscriber station according to an embodiment of the present invention.

FIG. 7 is a diagram schematically showing information included in a table manager of a GPON TDM switch of an optical line terminator according to an exemplary embodiment of the present invention.

Claims (10)

In the method of matching a plurality of voice terminals and a plurality of packet terminals to an optical communication network, Converting analog signals of the plurality of voice terminals into a plurality of digital signals, respectively; Inserting state information including whether each of the plurality of voice terminals are activated into an optical communication frame for voice service; Inserting a digital signal of an activated voice terminal among the plurality of digital signals into an optical communication frame for the voice service; And Multiplexing an optical communication frame for the voice service and an optical communication frame of the plurality of packet terminals and transmitting the multiplexing on an optical line; How to include. The method of claim 1, The state information, And a number of voice terminals multiplexed in the optical communication frame, data lengths of the plurality of voice terminals, and respective control signals of the plurality of voice terminals. In an apparatus for matching a plurality of voice terminals and a plurality of packet terminals to an optical communication network, A codec for converting analog signals of the plurality of voice terminals into a plurality of digital signals, respectively; Inserting state information including whether each of the plurality of voice terminals is activated into an optical communication frame for voice service, and inserting a digital signal of an activated voice terminal among the plurality of digital signals into the optical communication frame for the voice service An inserting GEM frame allocation unit; And A media control unit for multiplexing the optical communication frame for the voice service and the optical communication frames of the plurality of packet terminals and transmitting the multiplexed optical communication frames to an optical line Device comprising a. In the optical line terminator connected to a plurality of optical network terminators and connected to a public telephone network and the Internet, A medium for receiving an optical communication frame from the optical network termination device and dividing the optical communication frame into a first optical communication frame for a plurality of voice terminals and a second optical communication frame for a plurality of packet terminals according to a port identifier of a header of the optical communication frame. Control unit; A demultiplexer configured to demultiplex the first optical communication frame for each of the plurality of voice terminals to generate a demultiplexed optical communication frame; And An optical communication / voice communication conversion unit for separating the demultiplexed optical communication frame into state information and a voice signal of the optical communication frame and loading the voice signal in a time slot of a first voice communication line Optical line termination device comprising a. The method of claim 4, wherein If the voice signal on the time slot of the first voice communication line is to be transmitted to the second voice communication line, the optical line termination device further comprises a time slot switch for loading the voice signal in the time slot of the second voice communication line . The method of claim 5, Table management unit for receiving and managing the status information Optical line termination device further comprising. The method of claim 6, A link matching unit for connecting to a local exchange through the first voice communication line and the second voice communication line Optical line termination device further comprising. An optical communication frame generation method for a voice service for matching a plurality of voice terminals and packet terminals to an optical communication network, Inserting data of the plurality of voice terminals into an optical communication frame for the voice service; Inserting a data length for the data of the plurality of voice terminals and the number of the plurality of voice terminals into an optical communication frame for the voice service; And Inserting a control signal including an active or inactive state of each of the plurality of voice terminals into an optical communication frame for the voice service; Optical communication frame generation method for a voice service comprising a. The method of claim 8, Inserting a length of a payload of the optical communication frame into an optical communication frame for the voice service; Inserting the type of optical communication frame into an optical communication frame for the voice service; And Inserting a port identifier indicating the reception path information of the voice terminal of the optical communication frame into the optical communication frame for the voice service; Optical communication frame generation method further comprising. The method of claim 9, The control signal including each active or inactive state of the plurality of voice terminals, And inserting data of the voice terminal into the optical communication frame for the voice service when the voice terminal is active.

Images