KR100542403B1 - METHOD AND APPARATUS FOR WIDSL Subscriber Registration in EPON Network - Google Patents

Abstract

The present invention enables to provide high-speed data communication service and existing voice service through EPON (Ethernet Passive Optical Network) network, thereby unifying subscriber access network to facilitate installation and operation of VDSL (Very high speed subscriber) in EPON network. line) A subscriber matching method and apparatus, which separates VDSL data and POTS signals of a VDSL subscriber in an optical network termination device of an EPON network, encodes a POTS signal into a digital signal (PCM signal), and collects a plurality of POTS signals in an Ethernet frame. By packetizing the packet to the EPON network, it is possible to service the data traffic and the POTS traffic of the VDSL, thereby unifying the VDSL subscriber access network, thereby reducing the cost of installing and operating the subscriber access network.

Ethernet Passive Optical Network (EPON), Very High Speed Subscriber Line (VDSL), Plain Old Telephone Service (POTS), Optical Network Unit, Optical Line Terminator, Local Exchage

Description

Method and apparatus for registration of WSDL subscriber in EPON network {Method and apparatus for interfacing VDSL subscriber in EPON}

1 is a block diagram of a conventional VDSL subscriber access network.

2 is a schematic diagram of a VDSL subscriber access network according to the present invention.

Figure 3a is a block diagram showing a first embodiment of a VDSL subscriber registration device according to the present invention.

Figure 3b is a block diagram showing a second embodiment of a VDSL subscriber registration device according to the present invention.

4 is a detailed configuration diagram of a conventional voice service (POTS) module in a VDSL subscriber registration device according to the present invention.

5 is a configuration diagram of an Ethernet frame for a POTS signal in a VDSL subscriber matching device according to the present invention.

Figure 6 shows an example of a network configuration applying the VDSL subscriber matching device according to the present invention.

FIG. 7 is a signaling flowchart for establishing a connection from an outgoing telephone to an incoming telephone in FIG. 6.

FIG. 8 is a signaling flowchart of disconnection between an outgoing telephone and an incoming call period in FIG. 6.

Explanation of symbols on the main parts of the drawings

11: VDSL terminal device 12: General telephone

15 VDSL subscriber line 16: VDSL distributor

18: Local exchange (LE) 19: Optical ray termination device (OLT)

31: VDSL distributor 32: VDSL module

33,33 ': POTS Module 34,34': Ethernet Switch

35,35 ': EPON Media Access Controller (MAC)

The present invention can accommodate both high-speed data traffic and plain old telephone service (POTS) traffic of a Very High Speed subscriber line (VDSL) subscriber in an Ethernet Passive Optical Network (EPON), thereby preventing dualization of the VDSL subscriber access network. And a VDSL subscriber registration method and apparatus in an EPON network for convenience of operation.

At present, optical communication service is becoming more common with the development of optical communication technology. Recently, as the traffic of subscribers is increasing at a high speed, fiber to the curb (FTTC) or fiber to the home (FTTH) is installed to the threshold of subscriber home. As a result, the use of optical cables is gradually extended to subscriber terminal devices.

1 is a network configuration diagram of a conventional very high-data rate digital subscriber line (hereinafter referred to as VDSL) service configured as a VDSL terminal 11 equipped with a VDSL modem (not shown). And a general voice telephone 12, the VDSL terminal 11 and the voice telephone 12 share one subscriber line 15 by different bands through the VDSL distributor 16, and the subscriber At the end of the line 15, a digital subsvriber line access multiplexer (hereinafter referred to as DSLAM) 17 is provided, and the DSLAM 17 is connected to a circuit switched network (PSTN) through a local switch 18. 13 is connected to a packet switched network (PSDN / IP) 14 via an optical line terminal (OLT) 19.

For reference, in the field of information and communication, in order to distinguish between a telephone service based on a high speed and a digital communication line and a conventional analog communication line, which are started to be serviced with relatively new technologies such as ISDN and ADSL, The analog telephone service is called a plain old telephone service (POTS), and for the convenience of explanation, the existing analog telephone service will be described separately as POTS.

That is, in the above, the signal of the VDSL terminal 11 is a data signal, and the signal of the ordinary telephone 12 is a POTS signal.

The data and the POTS signal are transmitted to a single subscriber line 15 by different bands by the VDSL splitter 16, and then the POTS signal and the data again in the DSLAM 17 located at the end of the subscriber line 15. The separated POTS signal is matched with the local exchange 18 to the PSTN network 13, and the separated data is matched with the optical fiber terminator 19 and matched with the PSDN / IP network 14, respectively. Receive circuit switched and packet switched services.

That is, between the DSLAM 17, the subscriber station 11 and the telephone 12 by using the subscriber line 15 to provide services such as VDSL or ADSL, the DSLAM 17 is a PSTN (13) and PSDN / IP 14 is connected to each other, VDSL subscriber access network is dualized as above in order to match data traffic to PSDN network and POTS traffic to PSTN network.

However, since the transmission amount of the optical cable used as the high speed communication medium is much larger than the bandwidth required by the actual subscriber, the subscriber access network structure is a PON (Passive optical) in which multiple subscribers share a single subscriber line through a splitter. The PON network is divided into APON according to the protocol used, APON when accepting ATM protocol, EPON when accepting Ethernet protocol, and GPON when accepting ATM and Ethernet at the same time.

Among the above, EPON is an optical network terminator on the subscriber side via a splitter to one optical line terminator (OLT) located on the network side, and one ONU (Optical Network Unit) or ONT (Optical Network Terminator) Or a plurality of matching, the OLT and ONU is connected by the optical path, the ONU is located on the subscriber side of the EPON, VDSL matching device using copper wire to the subscriber terminal device or Ethernet interface of 10/100 / 1000 Mbps, POTS, etc. Subscriber devices are matched.

Therefore, when accepting a VDSL subscriber in the EPON network, it is possible to unify the VDSL subscriber access network.

The present invention has been proposed to solve the above-mentioned conventional needs, and an object thereof is to provide a high speed data communication service and an existing voice service through an EPON network, thereby unifying the subscriber access network to facilitate installation and operation. To provide a method and apparatus for VDSL subscriber registration in an EPON network.

As a construction means for achieving the above object, the present invention relates to a VDSL subscriber matching device in an EPON network comprising an optical network termination device connected to a VDSL subscriber line connected to a general telephone and a optical fiber termination device connected to a local exchange of a PSTN network. ,

At least one VDSL distributor for distributing the VDSL signals inputted from the VDSL subscriber lines and outputting them separately for data traffic and POTS signals, and conversely inputting the input data traffic and POTS signals to the corresponding VDSL subscriber lines;

At least one VDSL module for converting data traffic output from the at least one VDSL distributor into an Ethernet frame, and inversely converting the input Ethernet data into data traffic of a VDSL signal and delivering the same to the corresponding VDSL distributor;

Converting a plurality of POTS signals output from the at least one VDSL splitter to an Ethernet frame, demodulating the plurality of POTS signals in an Ethernet frame and outputting them to the corresponding VDSL subscriber line through the VDSL splitter, 1) through the VDSL splitter A plurality of subscriber line matching circuits, which are matched with a plurality of VDSL subscriber lines, for power supply, on-hook / off-hook and ring trip detection, and transmission and reception of POTS signals, and 2) corresponding subscriber lines according to the clocks provided by the following clock generators, respectively. 3) A plurality of codecs for modulating the POTS signal received from the matching circuit into a digital signal, demodulating the digital signal input in the reverse direction into the POTS signal, and outputting to the subscriber line matching circuit. Call signal generator to transmit to subscriber line, 4) On-hook / off-hook and ring trip inspection of the subscriber line matching circuit Microprocessor that controls the generation and stop of signaling signal for each VDSL subscriber line according to the signal and the message transmitted from EPON network. 5) By comparing the synchronous clock and reference clock included in packets periodically transmitted from OLT of EPON network. A clock generator which generates a clock synchronized with the local exchange of the PSTN network and provides a clock signal to each means in the POTS module, and 6) configures an Ethernet frame with digital signals modulated by the plurality of codecs, and reversely inputs the Ethernet. A POTS module comprising a PCM / Ethernet conversion unit which extracts a POTS digital signal from a frame and delivers the POTS digital signal to a corresponding codec;

An Ethernet switch transferring an Ethernet frame between the plurality of VDSL modules, the POTS module, and the EPON medium access controller described below; And

An Ethernet frame inputted from the Ethernet switch is transmitted to the EPON network at an allotted time, and on the contrary, an EPON medium access controller configured to transfer the Ethernet frame input from the EPON network to the Ethernet switch.

In addition, in the apparatus, the Ethernet switch prevents the delay of the POTS service by making the POTS traffic priority higher than the data traffic priority.

In addition, in the present invention, the POTS module is characterized in that it further comprises a plurality of overvoltage protection circuit to protect the circuit by removing the overvoltage flowing from the VDSL subscriber line.

In addition, in the VDSL subscriber matching device in the EPON network according to the present invention, an Ethernet MAC field indicating an Ethernet MAC address for an Ethernet frame for POTS, an IP / UDP field indicating an IP / UDP address of a destination, and POTS, respectively It consists of a plurality of channel fields carrying a modulated POTS signal and a frame check sequence (FCS) field carrying information for error detection, thereby enabling the transmission of POTS signals in an EPON network.

In addition, the present invention distributes the VDSL signal input from the VDSL subscriber line, respectively, and outputs it separately for data traffic and POTS signal, and conversely inputs the data traffic and the POTS signal and transmits the one or more VDSL subscriber lines respectively to the corresponding VDSL subscriber line. Distributor; At least one VDSL module for converting data traffic output from the at least one VDSL distributor into an Ethernet frame, and inversely converting the input Ethernet data into data traffic of a VDSL signal and delivering the same to the corresponding VDSL distributor; Converting a plurality of POTS signals output from the at least one VDSL distributor into an Ethernet frame, demodulating the plurality of POTS signals in an Ethernet frame and outputting them to the corresponding VDSL subscriber line through the VDSL distributor, 1) the plurality of VDSL subscribers A plurality of subscriber line matching circuits that are matched with the line for power supply, on-hook / off-hook and ring trip detection, and transmission and reception of POTS signals, and 2) each subscriber line matching circuit according to the clock provided by the following clock generator. A plurality of codecs for modulating the received POTS signal into a digital signal, demodulating the digital signal input in the reverse direction into a POTS signal and outputting it to the subscriber line matching circuit. 4) On-hook / off-hook and ring trip detection signals of the subscriber line matching circuit and the EPON network. Microprocessor that controls the generation and stop of signaling signal for each VDSL subscriber line according to message transmitted from 5) Locality of PSTN network by comparing synchronization clock and reference clock included in packet periodically transmitted from OLT of EPON network. A clock generator which generates a clock synchronized with the switch and provides a clock signal to each means in the POTS module, and 6) configures an Ethernet frame with digital signals modulated by the plurality of codecs, and reverses the POTS digital signal from the inputted Ethernet frame. POTS module consisting of a PCM / Ethernet conversion unit for extracting a signal and passing it to the corresponding codec; An Ethernet switch for transferring an Ethernet frame in the plurality of VDSL modules and EPON medium access control period; And transmit the Ethernet frame outputted from the POTS module to the EPON network at a higher priority than the Ethernet frame outputted through the Ethernet switch, and the Ethernet frame inputted from the EPON network checks the type, and the Ethernet frame loaded with VDSL data is Ethernet. The Ethernet frame, which outputs to the switch and carries the POTS signal, is composed of an EPON media access controller that transmits the POTS module to the POTS traffic, thereby minimizing the delay of the POTS traffic.

In addition, the present invention relates to a VDSL subscriber matching method in an EPON network including an optical termination device connected to a VDSL subscriber line connected to a general telephone and a local termination device connected to a local exchange of a PSTN network, wherein the first optical termination device is used in the first optical termination device. Detecting an off-hook of a general telephone and transmitting a connection setup signal to the first local exchange through the first optical line termination device when the off-hook is off-hook; Checking a connection setup signal at the first local exchange and transmitting a setup confirmation signal to a first optical network termination device through the first optical fiber termination device; Allocating a channel for a POTS service between the first local exchange and a first optical fiber terminator; Delivering a dial tone from a first local exchange to the first landline over the assigned channel; When the DTMF signal is transmitted from the first general telephone to which the dial tone is transmitted in the first optical terminator, transmitting the DTMF signal to the first local exchange through an assigned channel; Interpreting the DTMF signal by the first local exchange and transmitting the DTMF signal to a second local exchange of the called number; Allocating a channel between the second local switching device and a second optical fiber terminating device and a second optical network terminating device connected to the called number; The second local exchange transfers the connection setting of the first general telephone to the called second optical fiber termination device through the assigned channel, and simultaneously transmits the ringback tone to the first general telephone through the assigned channel. Transmitting a call signal from a second optical termination device to a second general telephone of a called number; And the second optical termination device detects whether the second general telephone to which the call signal has been transmitted is off-hook and becomes a ring trip, and transmits a setting confirmation signal to the second local exchange through the second optical line termination device when detecting the ring trip. The call channel is connected between the calling party first general telephone and the called party second general telephone period.

In addition, the VDSL subscriber matching method in the EPON network according to the present invention comprises the steps of: detecting the on-hook signal of the connected first or second general telephone in the first and second optical termination device; Transmitting an on-hook signal from the corresponding first or second optical termination device to the first or second local exchange device through the first or second optical fiber termination device when the on-hook signal is detected; The on-hook signal is transmitted from the first or second local exchange to the first and second optical fiber terminating device and the release signal and the channel allocation release signal and at the same time to transmit the release signal to the second or first local exchange of the other party. step; The disconnection signal of the first or second optical fiber terminating device is transmitted to the first or second optical fiber terminating device, the channel allocation is released for the deassignment signal, and the deassignment completion signal is transmitted to the first or second local exchange. Delivering; Transmitting a disconnection completion signal through the first or second optical fiber termination device to the first and second local exchange devices after disconnection from the first or second optical fiber termination device by the disconnection signal; The decommissioning signal is transmitted from the second or first local switching device receiving the release signal to the second or first optical fiber terminating device through the second or first optical fiber terminating device, and the deassignment is performed. Passing from the second or second optical termination device to the second or first local exchange; And when the second or first general telephone is on-hook after disconnection, the on-hook signal is transmitted to the second or first local exchange, thereby disconnecting between the second or first local exchange and the second or first optical termination device. By performing the steps, it is characterized in that the connection between the first general telephone and the second general telephone.

Hereinafter, a method and apparatus for accommodating VDSL subscribers in an EPON network according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic configuration diagram illustrating a connection network structure of a VDSL subscriber housed in an EPON network according to the present invention, wherein the VDSL terminal 11 and the general telephone 12 of the VDSL subscriber are connected to the VDSL subscriber line through the VDSL distributor 16. 15) is commonly connected to the end of the at least one VDSL subscriber line (15) connected as described above, the optical termination device 21 located at the subscriber side of the EPON 22 is connected, one or more optical termination device (21) Point-to-point or point-to-multipoint is connected to an optical line terminator (OLT) 19 on the network side through the EPON network 22, and the optical ray terminator 19 is a PSDN / IP network ( 14 is connected to another optical fiber terminator (not shown) or local exchange 18 of PSTN network 13.

In the above description, the optical network terminator 21 is an optical network unit (hereinafter referred to as ONU) or an optical network terminator (hereinafter referred to as ONT).

2 is a FTTC or FTTH type communication system. The optical termination device 21, which is a subscriber side device of the EPON network, matches the EPON 22 with the VDSL subscriber station 11 and the general telephone 12. FIG. In one embodiment, the signal input through the VDSL subscriber line 15 is separated into data and POTS signals, the plurality of POTS signals are bundled and converted into Ethernet frames, and then the Ethernet frames carrying the data and POTS signals are each EPON. (22) to the optical fiber terminator 19, and vice versa, converts the POTS signal transmitted from the optical fiber terminator 19 into an original analog signal, and then the VDSL subscriber line 15 with data having the same destination. ) To the subscriber station 11 and the general telephone 12, respectively.

In addition, the optical fiber terminator 19 located on the network side of the EPON network distinguishes the type of traffic transmitted from the optical fiber terminator 21, and the POTS traffic is transmitted to the PSTN network 13 through the local exchange 18. The data traffic is forwarded to the PSDN / IP network 14 according to the IP address.

By the above, the data of the subscriber terminal 11 of the VDSL subscriber and the POTS signal of the general telephone 12 can be serviced by sharing one EPON network.

In this network structure, the VDSL subscriber matching device and method according to the present invention are applied to the optical fiber termination device 21.

Figure 3a is a block diagram showing a first embodiment of the VDSL subscriber matching device of the EPON network according to the present invention, each connected to one VDSL subscriber line to separate the data traffic and POTS signal from the transmission signal of the VDSL subscriber, Conversely, at least one VDSL distributor 31 for transmitting data traffic and POTS signals to the VDSL subscriber line to the corresponding VDSL subscriber line and the VDSL data signals output from the at least one VDSL distributor 31 are input. One or more VDSL modules 32 which are demodulated and transmitted to the Ethernet switch 34 through the MII interface, and the data input from the Ethernet switch 34 is modulated into a VDSL signal and transmitted to the corresponding VDSL distributor 31; After receiving a plurality of POTS signals separated by one or more VDSL distributors 31, each pulse code modulation (PCM), and gathered into one Ethernet frame The Ethernet frame inputted to the Ethernet switch 34 and the Ethernet frame inputted from the Ethernet switch 34 classify PCM signals for each channel, demodulate them into a plurality of POTS signals, and deliver them to the corresponding VDSL distributor 31. 33) and the plurality of VDSL module 32 and the POTS module 33 are switched according to the MAC address and VLAN address of Ethernet to transfer the input data to the EPON MAC 35 through the Gigabit Media Independent Interface (GMII). Conversely, Ethernet frames carrying VDSL data among the Ethernet frames input from EPON MAC 35 are transmitted to the corresponding VDSL module 32 according to the destination address, and Ethernet frames carrying POTS signals are transmitted to POTS module 33. The switch 34 and the uplink data transmitted from the Ethernet switch 34 are transmitted to the EPON network 22 at an allotted time in consideration of priority, and the downlink data input from the EPON network 22 is transferred to the Ethernet. It consists of an EPON Media Access Control (hereinafter referred to as MAC) delivered to the switch 34.

Figure 3b shows a second embodiment of the VDSL subscriber matching device in the EPON network according to the present invention, similarly to Figure 3a, at least one VDSL distributor 31, at least one VDSL module 32, A POTS module 33 ', an Ethernet switch 34', and an EPON MAC 35 'are provided and perform the same function, wherein the POTS module 33' does not pass through the Ethernet switch 34 '. Directly connected to the EPON MAC 35 ', fixed bandwidth for the POTS signal is allocated, minimizing delay or delay variation of the POTS signal due to data traffic.

That is, the Ethernet frame carrying the POTS signal output from the POTS module 33 'is directly transmitted to the EPON MAC 35' through the fixed bandwidth, and the Ethernet frame carrying the POTS signal input from the EPON network 22 is the data traffic. It is transferred directly to the POTS module 33 'without considering the priority of the.

Next, FIG. 4 is a detailed configuration diagram of the POTS modules 33 and 33 'of the VDSL subscriber matching device according to the present invention. The POTS modules are connected to the VDSL subscriber line 15 through the VDSL distributor 31, respectively. A plurality of overvoltage protection circuits 41 for removing the overvoltage flowing from the subscriber line, and a plurality of overvoltage protection circuits 41 connected to each VDSL subscriber line through the overvoltage protection circuit 41 to detect power supply, on-hook / off-hook and ring trip. The subscriber line matching circuit 42 and the plurality of subscriber line matching circuits 42 modulate an analog signal input from the subscriber line 15 into a PCM signal and reversely input a PCM signal (e.g., For example, ITU / T G.711 of 64 kbps is demodulated to an analog signal and outputs through each subscriber preference matching circuit 42 and a number of codecs 43 and 20 Hz call signal generated when a subscriber calls to protect the corresponding overvoltage. Call to output to subscriber line through circuit 41 The MPU 45 which initializes the operation of the signal generator 44 and the POTS module, controls the ring relay for detecting on-hook / off-hook and providing a call signal, controlling generation and stop of signaling, and managing MAC and IP addresses. And a clock generator 46 for generating and supplying a clock synchronized with the local exchange 18 according to a synchronization packet periodically received from the optical fiber terminating device 19, and a PCM modulated from the plurality of codecs 43. Collects the signal into an Ethernet frame and outputs it to the Ethernet switch 34 or the EPON MAC 35 'through a medium independent interface (MII) interface, and the PCM signal input from the Ethernet switch 34 or the EPON MAC 35'. It is composed of a PCM / Ethernet conversion unit 47 to put them in the corresponding timeslot and transfer to the corresponding codec 43.

In the above configuration, the PCM signal modulated by the codec 43 has a plurality of time slots, for example, 32 time slots, so that a unique time slot is allocated to each VDSL subscriber so that the corresponding VDSL subscriber signal is assigned to the assigned time slot. To be communicated through. In addition, the clock generator 46 generates a clock signal for synchronizing with the local exchange 18, and is periodically received from the optical fiber terminator 19 to generate a clock signal synchronized with the local exchange 18. The clock generated by the synchronous packet and the internal digital clock generator is compared, and a clock signal synchronized with the local switch 18 is generated through a phase locked loop. In this manner, the subscriber line matching circuit 42, the codec 43, and the PCM / Ethernet converter 47 operate in accordance with the reference clock generated by the clock generator 46. The MPU 45 performs a control function for initializing and operating the device, and manages a MAC address or an IP address. It also provides ARP reply function when using IP address.

The number of POTSs mounted in the VDSL subscriber matching device configured as described above can be arbitrarily designed, and the data structure mounted on the Ethernet frame can be changed programmatically.

5 is a view illustrating a structure of an Ethernet frame accommodating a POTS signal converted by the PCM / Ethernet conversion unit 47 in the VDSL subscriber matching device according to the present invention, wherein the POTS signal Ethernet frame represents an Ethernet MAC address. MAC field, IP / UDP field indicating the IP / UDP address of the destination, a plurality of channel fields carrying a PCM signal modulated with a POTS signal, and an FCS carrying additional parity or CRC information for error detection. It consists of a (Frame Check Sequence) field.

In the Ethernet frame, one channel is assigned to one POTS subscriber, and each POTS subscriber uses an assigned time slot. The POTS signal maintains the assigned position in the Ethernet frame and connects to the designated POTS subscriber even after passing through the EPON network to maintain the virtual circuit between two POTS subscriber ends.

In the VDSL matching device as described above, among the signals input through the VDSL subscriber line 15, the data of the VDSL terminal device 11 as shown in FIG. 2 is transferred to the corresponding VDSL distributor 31 shown in FIGS. 3A and 3B. After input and separation, it is demodulated through the VDSL module 32 and transferred to the Ethernet switches 34 and 34 'through MII (media independent interface), and the MAC addresses of the Ethernets received by the Ethernet switches 34 and 34' are received. And switch according to the VLAN address to transfer the VDSL data input through the GMII interface to the EPON MAC (35, 35 '). The EPON MACs 35 and 35 'transmit the transferred VDSL data to the uplink (optical path terminator 19) in consideration of priority at the time allocated by the EPON network.

On the contrary, the Ethernet frame carrying the VDSL data transmitted from the optical fiber terminator 19 is input to the EPON MAC (35, 35 '), and transferred to the Ethernet switch (34, 34') through the GMII interface, Ethernet switch 34 34 ') is switched to the corresponding VDSL module 32 according to the MAC address, and then modulated into VDSL data in the corresponding VDSL module 32 and transmitted to the VDSL subscriber line 15 through the VDSL distributor 31. It is transmitted along the VDSL subscriber line 15 and input to the VDSL terminal 11 located at the end.

On the other hand, since the POTS signal has various signaling such as DTMF signal, call signal, dial tone, ring back tone, etc. in addition to the actual voice signal, such signaling processing is necessary.

The telephone 12 is connected to the optical network termination device 21 through the VDSL subscriber line 15, separated by the VDSL distributor 31 inside the optical network termination device 21, POTS modules 33, 33 ') Is entered. Accordingly, the POTS modules 33 and 33 'check the signal of the general telephone 12 to enable the POTS service to be performed in the EPON network.

Such processing of the POTS signal will be described in detail with reference to FIGS. 6 to 8.

6 is a schematic view showing a network structure according to the present invention connecting two POTS subscribers, in which the optical subscriber termination devices 62 and 67 are configured as shown in FIGS. 3A, 3B and 4. A VDSL subscriber matching device is provided.

7 and 8 illustrate a connection establishment and disconnection signaling procedure for the POTS service between the outgoing telephone 61 and the incoming telephone 68 shown in FIG. 6.

According to the POTS service procedure, when the POTS subscriber picks up the handset of the telephone 61 for making a call, the outgoing telephone 61 is switched from the on-hook state to the off-hook state, and the POTS module 33 of the optical network termination device 62 is used. 33 'determines whether the originating telephone 61 is in an off-hook state or an on-hook state by checking the POTS band signal of the VDSL subscriber line 15.

Therefore, when the outgoing telephone 61 sends the off-hook signal, the subscriber line matching circuit 42 of the POTS module 33 detects this, and the MPU 45 outputs the connection setting signal accordingly. The connection establishment signal is transmitted to the originating local exchange 64 through the upper optical fiber terminator 63 through the Ethernet switch 34 and the EPON MACs 35 and 35 '.

In response, the calling local switch 64 recognizes that the calling telephone 61 is in the off-hook state, and the optical network terminating device 62 sends a setting confirmation signal through the optical fiber terminating device 63 as an acknowledgment message for this signal. To pass.

The POTS modules 33 and 33 'of the optical fiber termination device 62 may receive the setting confirmation signal, and may confirm that the calling local switch 64 receives the setting signal, and the setting confirmation signal may not be received. If so, resend the connection setup signal.

In addition, the originating local exchange 64 receiving the connection setting signal transmits a channel assignment message to the optical fiber terminating device 63, and the optical fiber terminating device 63 receives the channel allocation message and allocates the corresponding channel for the POTS service. Sends an assignment complete message to the local exchange (64).

Thus, the local exchange 64 transmits a dial tone through the assigned channel, and the dial tone is transmitted to the outgoing telephone 61 via the optical fiber terminator 63 and the optical network terminator 62. Therefore, the calling party subscriber confirms the dial tone through the handset of the calling telephone 61, and then dials the destination and receiving telephone number.

The dialing number of the outgoing telephone 61 is transmitted to the optical fiber terminator 62 along the VDSL subscriber line as a DTMF signal, and then converted into a PCM signal by the POTS module 33 of the optical fiber terminator 62, and the Ethernet frame It is carried on the assigned channel of and transmitted to the upper optical fiber terminator 63, and then transmitted to the originating local exchange 64.

The originating local exchange 64 then interprets the received DTMF signal and signals it to the destination local exchange 65 by inter-station signaling.

Therefore, on the called side, channel assignment is made from the local switch 65 to the optical fiber terminating device 66 and the optical fiber terminating device 67, and when the channel allocation is completed, the allocation completion signal is transmitted to the local exchange 65. As described above, when the channel assignment is completed on the called side, the setting message is transmitted from the called local exchange 65 to the optical end terminator 67 via the called side optical ray terminating unit 66, The POTS modules 33 and 33 'transmit a call signal to the terminating telephone 68 according to the setting message transmitted as described above.

By the above process, the ringing tone is generated in the called telephone 68, and when the called subscriber picks up the receiver of the called telephone 68, a ring trip is generated, which is a POTS module of the called optical termination device 67. 33, 33 '), and the receiving end optical network terminating device 67 which detects the ring trip transmits the setting confirmation message to the terminating local exchange 65 via the optical line terminating device 66. The connection through the EPON network is completed between the 61 and the called telephone 68.

After that, the voice signals of the calling party and the called party telephones 61 and 68 are respectively modulated into digital signals (PCM signals) by the connected optical network termination devices 62 and 67, and then transferred to the other side through a channel connected to the Ethernet frame. The received voice data is demodulated in the original analog signal at each optical termination device 62, 67 and then transmitted to the other telephone 61 or 68 through the VDSL subscriber line. Thereby, voice communication is performed through the calling telephone 61 and the called telephone 68. FIG.

On the other hand, when the call ends, the on-hook is detected at the side where the handset is put down first, and disconnection signaling is performed. In the figure of Figure 8 is set to be disconnected from the outgoing telephone 61 is started.

That is, when the handset is lowered from the outgoing telephone 61 during the call and is in the on-hook state, the detected on-hook is operated by the operation of the POTS modules 33 and 33 'and the optical network termination device 62 described above. It is transmitted to the local exchange 64 through, the local exchange 64 receiving the on-hook signal sends a disconnection signal to the optical network termination device 62 through the optical fiber termination device (63). When the connection with the local exchange 64 is released by the above, the release completion signal is transmitted to the local exchange 64 via the optical fiber terminator 63, and the local exchange 64 is transmitted to the optical fiber terminator 63. Signal to release channel assignment. Thus, the channel allocated for the outgoing telephone 61 is released.

Then, the local switch 64 sends a disconnection signal to the local switch 65 that is in charge of the other phone, the local switch 65 of the other end of the optical network termination device (67) through the optical line termination device 66 The deassignment signal is transmitted, and the channel assignment is released from the optical termination device 67, and the deassignment completion signal is transmitted to the local exchange 65 via the optical ray termination device 66.

Subsequently, when the on-hook signal is generated when the receiver of the incoming telephone 68 is placed, it is transmitted by the optical network termination device 67 to the local exchange 65 via the optical fiber termination device 66, and by the local exchange 65. The disconnection signal is applied to the lower optical ray terminating device 66 and the optical fiber terminating device 67, and accordingly, the connection completion signal is released after the connection between the local exchange 65 and the optical fiber terminating device 67 is released. By passing to 65), the general electric powers 61 and 68 at both ends are disconnected.

As described above, the VDSL matching device according to the present invention accommodates the VDSL subscriber in the optical termination device (ONU or ONT) located on the subscriber side of the EPON network, while coding POTS traffic into digital data and then packetizing and transmitting the packet to Ethernet. In addition, it is effective to service not only data traffic but also POTS traffic through one EPON network. In addition, the structure of VDSL subscriber access network for high-speed data service and POTS service can be simplified, thereby reducing installation and operation costs. That has an excellent effect.

Claims (7)

A VDSL subscriber matching device in an EPON network including an optical network termination device (ONU) connected to a VDSL subscriber line connected to a general telephone and an optical fiber termination device (OLT) connected to a local exchange in a PSTN network. At least one VDSL distributor for distributing the VDSL signals inputted from the VDSL subscriber lines and outputting them separately for data traffic and POTS signals, and conversely inputting the input data traffic and POTS signals to the corresponding VDSL subscriber lines; At least one VDSL module for converting data traffic output from the at least one VDSL distributor into an Ethernet frame, and inversely converting the input Ethernet data into data traffic of a VDSL signal and delivering the same to the corresponding VDSL distributor; Converting a plurality of POTS signals output from the at least one VDSL splitter into an Ethernet frame, demodulating the plurality of POTS signals in an Ethernet frame and outputting them to the corresponding VDSL subscriber line through the VDSL splitter, 1) through the VDSL splitter A plurality of subscriber line matching circuits, which are matched with a plurality of VDSL subscriber lines, for power supply, on-hook / off-hook and ring trip detection, and transmission and reception of POTS signals, and 2) corresponding subscriber lines according to the clocks provided by the following clock generators, respectively. 3) A plurality of codecs for modulating the POTS signal received from the matching circuit into a digital signal, demodulating the digital signal input in the reverse direction into the POTS signal, and outputting to the subscriber line matching circuit. Call signal generator to transmit to subscriber line, 4) On-hook / off-hook and ring trip inspection of the subscriber line matching circuit Microprocessor that controls the generation and stop of signaling signal for each VDSL subscriber line according to the signal and the message transmitted from EPON network. 5) By comparing the synchronous clock and reference clock included in packets periodically transmitted from OLT of EPON network. A clock generator which generates a clock synchronized with the local exchange of the PSTN network and provides a clock signal to each means in the POTS module, and 6) configures an Ethernet frame with digital signals modulated by the plurality of codecs, and reversely inputs the Ethernet. A POTS module comprising a PCM / Ethernet conversion unit which extracts a POTS digital signal from a frame and delivers the POTS digital signal to a corresponding codec; An Ethernet switch transferring an Ethernet frame between the plurality of VDSL modules, the POTS module, and the EPON medium access controller described below; And VDSL subscriber in the EPON network comprising an EPON medium access controller that transmits the Ethernet frame input from the Ethernet switch to the EPON network at an allotted time and, conversely, transfers the Ethernet frame input from the EPON network to the Ethernet switch. Matching device. The method of claim 1, wherein the Ethernet switch The Ethernet frame carrying the POTS signal is switched to a higher priority than the Ethernet frame carrying the data traffic VDSL subscriber matching device in the EPON network. The method of claim 1, wherein the POTS module And a plurality of overvoltage protection circuits each connected to a VDSL subscriber line through the VDSL distributor, thereby eliminating overvoltage inflow from the VDSL subscriber line. The method of claim 1, wherein the Ethernet frame processed in the POTS module An Ethernet MAC field indicating an Ethernet MAC address, an IP / UDP field indicating an IP / UDP address of a destination, a plurality of channel fields carrying digital signals which are assigned to each VDSL subscriber and modulated with a POTS signal of the corresponding VDSL subscriber; And a frame check sequence (FCS) field in which information for error detection is carried. At least one VDSL distributor for distributing the VDSL signals inputted from the VDSL subscriber lines and outputting them separately for data traffic and POTS signals, and conversely inputting the input data traffic and POTS signals to the corresponding VDSL subscriber lines; At least one VDSL module for converting data traffic output from the at least one VDSL distributor into an Ethernet frame, and inversely converting the input Ethernet data into data traffic of a VDSL signal and delivering the same to the corresponding VDSL distributor; Converting a plurality of POTS signals output from the at least one VDSL distributor into an Ethernet frame, demodulating the plurality of POTS signals in an Ethernet frame and outputting them to the corresponding VDSL subscriber line through the VDSL distributor, 1) the plurality of VDSL subscribers A plurality of subscriber line matching circuits that are matched with the line for power supply, on-hook / off-hook and ring trip detection, and transmission and reception of POTS signals, and 2) each subscriber line matching circuit according to the clock provided by the following clock generator. A plurality of codecs for modulating the received POTS signal into a digital signal, demodulating the digital signal input in the reverse direction into a POTS signal, and outputting it to the subscriber line matching circuit. 3) Generate a 20 Hz call signal and transmit it to the corresponding VDSL subscriber line. 4) On-hook / off-hook and ring trip detection signals of the subscriber line matching circuit and the EPON network. Microprocessor that controls the generation and stop of signaling signal for each VDSL subscriber line according to message transmitted from 5) Locality of PSTN network by comparing synchronization clock and reference clock included in packet periodically transmitted from OLT of EPON network. A clock generator which generates a clock synchronized with the switch and provides a clock signal to each means in the POTS module, and 6) configures an Ethernet frame with digital signals modulated by the plurality of codecs, and reverses the POTS digital signal from the inputted Ethernet frame. POTS module consisting of a PCM / Ethernet conversion unit for extracting a signal and passing it to the corresponding codec; An Ethernet switch for transferring an Ethernet frame in the plurality of VDSL modules and EPON medium access control period; And The Ethernet frame output from the POTS module is transferred to the EPON network with higher priority than the Ethernet frame output through the Ethernet switch, and the Ethernet frame input from the EPON network checks the type, and the Ethernet frame loaded with VDSL data is an Ethernet switch. The VDSL subscriber matching device in the EPON network, which consists of an EPON media access controller that outputs the Ethernet frame and transmits the POTS signal to the POTS module. In a VDSL subscriber matching method in an EPON network including an optical termination device connected to a VDSL subscriber line connected to a regular telephone and an optical fiber termination device connected to a local exchange of a PSTN network, Detecting an off-hook of the first general telephone by the first optical termination device and transmitting a connection setup signal to the first local exchange through the first optical-wire termination device when the off-hook is detected; Checking a connection setup signal at the first local exchange and transmitting a setup confirmation signal to a first optical network termination device through the first optical fiber termination device; Allocating a channel for a POTS service between the first local exchange and a first optical fiber terminator; Delivering a dial tone from a first local exchange to the first landline over the assigned channel; When the DTMF signal is transmitted from the first general telephone to which the dial tone is transmitted in the first optical terminator, transmitting the DTMF signal to the first local exchange through an assigned channel; Interpreting the DTMF signal by the first local exchange and transmitting the DTMF signal to a second local exchange of the called number; Allocating a channel between the second optical switch and a second optical terminator connected to the called number; The second local exchange transfers the connection setting of the first general telephone to the called second optical fiber termination device through the assigned channel, and simultaneously transmits the ringback tone to the first general telephone through the assigned channel. Transmitting a call signal from a second optical termination device to a second general telephone of a called number; And The second optical termination device detects whether the second general telephone to which the call signal is transmitted is off-hook to become a ring trip, and transmits a setting confirmation signal to the second local exchange through the second optical fiber termination device when detecting the ring trip. step A method of matching a VDSL subscriber in an EPON network, characterized in that a call channel is connected between a calling party first general telephone and a called party second general telephone period. The method of claim 6, Detecting an on-hook signal of the connected first general telephone or second general telephone in a first and second optical termination device; Transmitting an on-hook signal from the corresponding first or second optical termination device to the first or second local exchange device through the first or second optical fiber termination device when the on-hook signal is detected; The on-hook signal is transmitted from the first or second local exchange to the first and second optical fiber terminating device and the release signal and the channel allocation release signal and at the same time to transmit the release signal to the second or first local exchange of the other party. step; The disconnection signal of the first or second optical fiber terminating device is transmitted to the first or second optical fiber terminating device, the channel allocation is released for the deassignment signal, and the deassignment completion signal is transmitted to the first or second local exchange. Delivering; Transmitting a disconnection completion signal through the first or second optical fiber termination device to the first and second local exchange devices after disconnection from the first or second optical fiber termination device by the disconnection signal; The decommissioning signal is transmitted from the second or first local switching device receiving the release signal to the second or first optical fiber terminating device through the second or first optical fiber terminating device, and the deassignment is performed. Passing from the second or second optical termination device to the second or first local exchange; And If the second or first general telephone is on-hook after disconnection, the on-hook signal is transmitted to the second or first local exchange, whereby the disconnection between the second or first local exchange and the second or first optical termination device is made. step And releasing a connection between the first general telephone and the second general telephone by performing a VDSL subscriber matching method in an EPON network.

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