KR20060070299A - Apparatus for iptv packet parsing in olt and method thereof - Google Patents

Abstract

An apparatus and method for controlling an IPTV service in an OLT for an IPTV service are disclosed. The IPTV service control apparatus in the OLT according to the present invention refers to a routing separator that separates and transmits a communication traffic and an IPTV traffic from an incoming traffic. A communication switch that unicasts, a broadcast switch that broadcasts IPTV traffic on a first-in-first-out basis when IPTV traffic is transmitted from the communication separation unit, and each is unicast according to a destination address from the IPTV traffic or communication switch broadcasted from the broadcast switch. It includes a plurality of communication multiplexing unit for transmitting the communication traffic to the external network, can support the fast channel selection function for the pre-registered IPTV traffic and minimize the packet loss and delay variation.

Description

IPTV service control device and method in OLT {Apparatus for IPTV Packet Parsing in OLT and Method Thereof}

1 is a diagram illustrating a subscriber access network structure for providing an IPTV service in an EPON network.

2 is a diagram schematically showing an embodiment of an IPTV service control apparatus in an OLT according to the present invention.

3 is a view schematically showing an embodiment of the barrel separation unit 200 shown in FIG.

4 illustrates an embodiment of the broadcast channel table 330 shown in FIG. 3.

5 is a diagram schematically showing another embodiment of an IPTV service control apparatus in an OLT according to the present invention.

The present invention relates to an OLT for high-speed data service and IPTV service as an Internet protocol in an Ethernet-based passive optical communication network. In particular, the present invention provides a fast channel selection function for real-time IPTV traffic and minimizes packet loss and jitter. It relates to an IPTV service control apparatus and method in the OLT for providing a.

At present, as optical communication technology is developed and subscriber traffic is increased at a high speed, fiber to the curb (FTTC) or fiber to the home (FTTH) where optical paths are installed to the subscriber's home is becoming widespread, and the optical cable is gradually connected to the subscriber terminal device. This is expanding.

Since the transmission amount of such optical cable is much larger than the bandwidth required by each subscriber, it is developing into an Ethernet-based passive optical network (EPON), which is shared by multiple Ethernet subscribers through a splitter. EPON is a combination of multiple Optical Network Terminals (ONTs) or ONUs (Optical Network Units) via a splitter on one Optical Line Terminal (OLT) connected to the network side. ONT is connected by optical cable for point-to-multipoint communication (Glen Kramer and Gerry Pesavento, Ethernet Passive Optical Network (EPON): Building a Next-Generation Optical Access Network, IEEE Communication Magazine, Feb, 2002).

However, since the EPON system is based on Ethernet, it is difficult to provide an IPTV service requiring high quality in real time due to high bandwidth utilization but high delay and delay variation. Similarly, out-of-band signals are used to provide CATV services.

As a proposed technology for IPTV service, an integrated IP network (US Patent Publication No. 6,711,623, integrated IP network) that provides a video and broadcast service using an IP network or an IP protocol has a best effoert. According to this patent, in order to deliver various services such as IP service, voice service, video and broadcasting service to one integrated IP network, detailed network is separated by service such as best service network, video and broadcasting service network, and voice service network. In addition, by adding an integrated IP network header designating each subnetwork in the edge router, it selects the network required by each service and provides the required QoS to provide a broadcast service through the IP network. This method can provide video and broadcasting service using IP network or IP protocol, and can provide QoS that is relatively superior to general IP network through separate detailed network. There is a problem that needs to be configured and managed in detail network.

Another proposed technique is EPFT's FTTH multimedia access system (US Patent Publication 2002 / 0063924A1, Fiber to the home (FTTH) multimedia access system with refelection PON). This is a method of providing general communication traffic and CATV service by using two wavelengths in an optical cable. Specifically, when the OLT side transmits the communication traffic having a wavelength of 1 and the CATV signal having a wavelength of 2 to a WDM (Wave Division Multiplexing) multiplexer and delivers the signal to ONU / ONT, the two signals are separated from the ONU / ONT by the WDM demultiplexer and the CATV signal is separated. CATV is a set-top box, and communication traffic is transmitted to a communication terminal device. According to this method, it is possible to simultaneously provide communication traffic and CATV service through the EPON network, but it is expensive because two wavelengths are used, and it is difficult to converge communication because communication is not directly performed between the two wavelengths. There is a problem that it is difficult to receive CATV data in the same band signal (inband).

An object of the present invention is to provide an apparatus for controlling an IPTV service in an OLT for supporting a fast channel selection function for real-time IPTV traffic and providing an IPTV service by minimizing packet loss and jitter.

Another object of the present invention is to provide a method for controlling an IPTV service in an OLT for providing an IPTV service.

An apparatus for controlling an IPTV service in an OLT according to the present invention for achieving the technical problem is a communication separation unit for separating and transmitting a communication traffic and an IPTV traffic from an input traffic, and when the communication traffic is transmitted from the communication separation unit, a destination address of the communication traffic. A communication switch unicast with reference to a routing table, a broadcast switch that broadcasts IPTV traffic on a first-in, first-out basis when IPTV traffic is transmitted from the room divider, and each is a destination from an IPTV traffic or communication switch broadcasted from the broadcast switch. It is preferable to include a plurality of communication multiplexing unit for transmitting the communication traffic unicast according to the address to the external network.

An apparatus for controlling an IPTV service in an OLT according to the present invention for achieving the above technical problem, when traffic arrives, separates the communication traffic and the IPTV traffic, and the separated communication traffic is separated and buffered again according to a destination address, and internally fed back. Input buffer section for buffering IPTV traffic, refer to routing table, unicast split-buffered communication traffic according to destination address, and input according to switching operation of crossbar switch and crossbar switch for broadcast IPTV traffic. A multicast output buffer that buffers IPTV traffic separated from the buffer section and multicasts back to the input buffer section on a first-in first-out basis, and each outputs a plurality of outputs buffering broadcast IPTV traffic or unicast communication traffic to the external network. Output buffer section including buffers To include preferred.

According to another aspect of the present invention, there is provided a method for controlling an IPTV service in an OLT according to a destination address of communication traffic separated in steps (a) and (a). (B) unicasting the IPTV traffic separated in step (b) by unicast with reference to the routing table, and communication traffic unicast according to the broadcasted IPTV traffic or destination address. It is preferable to include the step (d) for transmitting to the external network.

In the method of controlling an IPTV service in an OLT according to the present invention for achieving another object, the communication traffic separated in steps (a) and (a) is separated according to a destination address when traffic arrives. (B) buffering and multicast-feeding the separated IPTV traffic in first-in, first-out, (d) buffering the multicast-feedback IPTV traffic in step (b) and separating and buffering the routing table. With reference, unicast the separated buffered communication traffic according to the destination address, and (e) broadcasting the buffered IPTV traffic in step (d) and buffering the broadcasted IPTV traffic or unicast communication traffic. It is preferable to include the step (f) for transmitting to the network.

Hereinafter, an IPTV service control apparatus and method thereof in an OLT according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a subscriber access network structure for providing an IPTV service in an EPON network. Referring to FIG. 1, in an EPON network consisting of an OLT 4 and an ONU / ONT 5.6, the OLT 4 matches communication traffic with IPTV traffic and communicates with the ONU / ONT. IPTV broadcasting is transmitted from the central broadcasting station (1) to the OLT (4) through the Internet network (1) or to the local CATV broadcasting station (3) by a dedicated leased line and from the local CATV broadcasting station to the OLT (4) through the Ethernet or HFC network. To pass. The OLT 4 and the Internet network 1 have an Ethernet interface, and the OLT 4 and the local CATV broadcasting station 3 may be matched with an Ethernet or HFC network. In the case of matching to the HFC network, the IP converter 21 converts the optical signal and the IP data and then matches. The OLT 4 transmits communication traffic and IPTV traffic to subscribers through the EPON (or Ethernet) network, and one EPON is matched with 16 or 32 ONU / ONTs 5 and 6 through the splitter 8. All downlink data transmitted from the OLT (4) is delivered to all ONU / ONT (5,6), and the ONU / ONT (5,6) receives data necessary for itself and transmits it to the terminal device through the Ethernet interface. ONU / ONT (5,6) monitors the IPTV subscription and withdrawal of the lower terminal by IGMP snooping, selects the IPTV channel data subscribed to the lower terminal and delivers it to the port to which the terminal is connected so that the terminal receives IPTV. To receive it.

2 is a view schematically showing a temporary example of the IPTV service control apparatus in the OLT according to the present invention, the room separation unit 200, the communication switch 210, the broadcast switch 220 and the room multiplexing unit 240 It is configured to include.

Referring to FIG. 2, the room separation unit 200 separates the communication traffic and the IPTV traffic from the input traffic IN, thereby transmitting the communication traffic to the communication switch and delivering the IPTV traffic to the broadcast switch. The barrel separation unit 200 will be described in detail with reference to FIG. 3.

The communication switch 210 may utilize a general L2 / L3 switch including an Ethernet switch. When communication traffic is transmitted from the communication separator 200, the communication switch 210 refers to a routing table according to a destination address and transmits the communication to the corresponding communication multiplexer 246. do. Although the communication switch 210 may be configured in various ways, in FIG. 2, the input buffer unit 212 including one or more input buffers 212a, one or more crossbar switches 214, and a plurality of output buffers 216a are illustrated in FIG. A crossbar switch type is shown that includes an output buffer portion 216 that is comprised of two wires. In addition, the communication switch 210 may be configured as a shared memory type, an output buffer type or an input buffer type. Each input buffer 212a has a VOQ (Virtual Output Queue 212b) corresponding to each output buffer 216a. When communication traffic is transmitted from the room separator 200, the input buffer 212a refers to the routing table according to the destination address. Stored in VOQ 212b. Communication traffic stored in each VOQ 212b is passed through the crossbar switch 214 to the corresponding output buffer 216a. Although not shown, each output buffer 216a may have a queue for each service class, and may separately store communication traffic delivered from the VOQ 212b of the input buffer unit 212 for each class.

The broadcast switch 220 broadcasts the IPTV traffic received from the room separation unit 200 to all the room multiplexers 246 in the order of arrival. In this case, the buffer of the broadcast switch 220 may be configured as one FIFO queue or divided into priority queues.

The multiplexer 230 transmits IPTV traffic and communication traffic transmitted from the broadcast switch 220 and the communication switch 210 to the corresponding ONU / OLT although not shown. As shown in FIG. 2, the multiplexer 230 includes a plurality of multiplex multiplexers 246 including one input buffer 242 and one multiplex switch 244. In addition, the input buffer 242 includes a buffer 242a for IPTV traffic transmitted from the broadcast switch 220 and a buffer 242b for communication traffic transmitted from the communication switch 210. When the IPTV traffic is delivered to the input buffer 242, the multiplexing switch 244 switches to the buffer 242a to output IPTV traffic. When the communication traffic is delivered, the multiplex switch 244 switches to the buffer 242b to output the communication traffic. When IPTV traffic and communication traffic are simultaneously delivered to the input buffer 242, it is preferable to switch the IPTV traffic first. In addition, each multiplexing unit 246 monitors IGMP data via the multiplexing unit 246 using the IGMP snooping function, so that subscribers of the corresponding multiplexing unit join or leave a specific IPTV channel. Management, and receives the IPTV traffic from the broadcast switch, even if a single subscriber passes the data of the subscribed channel or discards the channel data. At this time, by selecting the base channel, the base channel can always be delivered regardless of the subscriber subscription and withdrawal.

In general, a communication switch having a large number of input / output ports will cause packet loss or jitter in the input buffer if the internal speed is not high enough. Therefore, the internal speed of the communication switch is sufficiently high to prevent packet loss or jitter in the switch input buffer. However, this requires a complicated configuration and a deterioration of some degree in case of heavy traffic. In this case, when the IPTV service and the communication service requiring the real-time multicast service using one communication switch are greatly degraded. However, by separately providing the broadcast switch 220 for the IPTV service as in the present invention, it is possible to guarantee the arrival order for the IPTV data and to minimize packet loss and jitter.

FIG. 3 is a block diagram schematically showing an embodiment of the barrel separation unit 200 shown in FIG. 2. 2, the room separator 200 includes an IPTV packet separator 300, a transmitter monitoring unit 310, a bandwidth monitoring unit 320, and a broadcast channel table 330.

3, a destination address, a source address, a bandwidth, a channel priority, and the like of a channel providing an IPTV are registered in the broadcast channel table 330.

When the packet arrives, the IPTV packet management unit 300 refers to the broadcast channel table 330 and checks whether a destination IP of the arrived packet is a packet for a channel registered in the broadcast channel table 330. . The operator registers the destination address of the IPTV channel for the IPTV channel provider requesting the high quality IPTV service in the broadcast channel table 330 in advance. The IPTV packet manager 300 checks the destination address registered in the broadcast channel table 330 to confirm whether the received packet is a destination address for the registered channel. If the result of the check is that the destination address is a pre-registered IPTV channel, the received packet is transmitted to the source monitoring unit 310, otherwise, it is classified as communication data and transmitted to the communication switch 210.

When the IPTV packet is transmitted from the IPTV packet management unit 300, the source monitoring unit 310 refers to the broadcast channel table 330 and checks whether the source IP address of the transmitted packet is for the registered IPTV channel. do. If the result of the check is a packet for the registered IPTV channel, it is transmitted to the bandwidth monitoring unit 320. However, if it is not a registered IPTV channel, it is discarded. For example, if an IPTV channel provider who does not request a high quality IPTV service transmits a packet using the same destination address as a registered IPTV channel, if the source address is not checked, the packet is normally delivered to the subscriber, and the high quality IPTV service is legitimately. The IPTV channel provider requesting the request may be damaged. Therefore, it is preferable that the source monitoring unit 310 checks the source address and removes the packet for the malicious user.

The bandwidth monitoring unit 320 monitors the bandwidth of the packet transmitted from the source monitoring unit 310 and checks whether the bandwidth allocated to the IPTV channel is satisfied in advance, and if so, transmits it to the broadcast switch 220 as it is, and allocates it. When the bandwidth is exceeded, only packets for the allocated bandwidth are transmitted to the broadcast switch 220. If any IPTV channel generates excessive traffic, the quality of other channel traffic and communication traffic can be degraded, and bandwidth can be monitored to prevent such problems.

4 illustrates an embodiment of the broadcast channel table 330 shown in FIG. 3.

One IPTV broadcast channel has parameters such as destination address, one or more source addresses, required bandwidth and priority, and the like. The destination address of the broadcast channel table generally indicates an IP address, and in the case of an L2 switch, an L2 address may be used. Priority may selectively use the priority of the received packet and the priority specified in this table. These parameters add or delete entries when a new IPTV broadcast is added or released. An IPTV broadcast channel not registered in the IPTV broadcast channel is treated as communication traffic and served.

FIG. 5 is a diagram schematically showing another embodiment of an IPTV service control apparatus in an OLT according to the present invention, and includes an input buffer unit 500, a crossbar switch 520, and an output buffer unit 540.

Referring to FIG. 5, when the mixed communication / IPTV traffic is input from the external network, the input buffer unit 500 separates the communication traffic and the IPTV traffic, and separates the communication traffic according to the destination address and transmits the same to the crossbar switch 520. do. Here, the broadcast traffic can be separated by examining the destination address of the input traffic as described above. In addition, the input buffer unit 500 multicasts internally fed back broadcast traffic.

In detail, the input buffer unit 500 includes a plurality of input buffers 505 and a multicast input buffer 510. In addition, each input buffer 505 includes output buffers 545 constituting the output buffer unit 540 and VOQs 505a and 505b corresponding to each of the multicast output buffers 550. In this case, each of the VOQs 505a corresponds 1: 1 to each of the output buffers 545, and the VOQ 505b corresponds to the output buffer 550. The input buffer 505 separates the communication traffic and the IPTV traffic when the traffic is input from the external network, and the IPTV traffic is buffered in the VOQ 505b and transmitted to the crossbar switch 520, and the communication traffic is separated again according to the destination address. Each of the VOQs 505a is buffered and transmitted to the crossbar switch 520. In addition, the multicast input buffer 510 buffers IPTV traffic fed back to the multicast from the output buffer 550 in each of the VOQs 505a and transmits it to the crossbar switch 520. That is, IPTV traffic is multicasted to the VOQs 505a of the multicast input buffer 510 and buffered, which is sent back to the corresponding output buffer 545, so that the IPTV traffic is multicasted to the output buffers 545. do.

Subsequently, the crossbar switch 520 broadcasts the IPTV traffic transmitted from the input buffer 500 and unicasts the communication traffic according to the destination to the corresponding output buffers 545 and 550. In this case, the crossbar switch 520 may select a priority specified in IEEE 802.1p / q for IPTV traffic. If the priority is not specified, the crossbar switch 520 may be assigned to priority 1. When assigning priority 1 to IPTV traffic, if IPTV traffic and communication traffic are simultaneously transmitted to the same output buffer 545, IPTV traffic is transmitted preferentially and communication traffic is waited until transmission of broadcast traffic is completed. .

The output buffer unit 540 receives the IPTV traffic separated by the switching operation of the crossbar switch 520, multicasts the feedback to the broadcast input buffer 510, and communicates or broadcasts unicast by the crossbar switch 520. IPcast traffic is buffered and transmitted to the external network.

Specifically, each of the output buffers 545 receives communication traffic from the VOQs 505a of the corresponding input buffer 505 and transmits IPTV traffic from the VOQs 505a of the corresponding multicast input buffer 510. Receive. The output buffers 545 transmit the received communication or IPTV traffic to the external network by first in, first out. In addition, the multicast output buffer 550 receives IPTV traffic from the VOQs 505b of the corresponding input buffer 505 and multicasts the feedback back to the VOQs 505a of the multicast input buffer 510. On the other hand, although not shown, each output buffer 545 may have a queue for each service class, and may transmit communication or IPTV traffic transmitted from the VOQs 505a of the input buffer 505 and the multicast input buffer 510. Can be stored separately by class.

As described above, the IPTV traffic arriving at the input buffer 505 is separated from the communication traffic and transmitted to the multicast output buffer 550, and the multicast output buffer 550 receives the multicast input buffer again on a first in, first out basis. Multicast feedback to 510. The multicast input buffer 510 multicasts the fed back IPTV traffic to the output buffers 545, thereby minimizing jitter without changing the service order between channels of broadcast traffic by communication data.

Meanwhile, in order for the apparatus illustrated in FIG. 6 to have the same effect as the apparatus described with reference to FIGS. 2 and 3, it is preferable to perform a source address and bandwidth check before the separated broadcast traffic is buffered in the VOQ 505b.

As described above, according to the IPTV service control apparatus and method thereof in the OLT according to the present invention for IPTV service, it is possible to support fast channel selection for pre-registered IPTV traffic and minimize packet loss and delay variation. Through this, it is possible to provide a communication and broadcasting service by unifying the subscriber network, which has been converted through communication and broadcasting, into an Ethernet-based subscriber access network, and provide a communication terminal and an IPTV service as a single terminal. In addition, since communication and broadcast have the same IP protocol, communication traffic and broadcast traffic are transmitted identically and exchanged with each other, thereby creating a new service in which a communication service and a broadcast service are converged.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the above-described specific preferred embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

As described above, according to the IPTV service control apparatus and method thereof in the OLT according to the present invention for IPTV service, it is possible to support the fast channel selection function for the pre-registered IPTV traffic and to minimize packet loss and delay variation.

Claims (14)

A communication separator for separating and transmitting communication traffic and IPTV traffic from the input traffic; A communication switch unicast with reference to a routing table according to a destination address of the communication traffic when communication traffic is transmitted from the communication separator; A broadcast switch that broadcasts the IPTV traffic on a first-in, first-out basis when the IPTV traffic is transmitted from the room separator; And Each IPTV service control in the OLT comprises a plurality of communication multiplexing unit for transmitting the IPTV traffic broadcast from the broadcast switch or the communication traffic unicast from the communication switch according to the destination address to the external network. Device. The method of claim 1, wherein the cylindrical separator is  A broadcast channel table storing information including a destination address, a source address, a bandwidth, and a priority for an IPTV channel; An IPTV packet management unit for checking whether a destination address of the received traffic is a channel registered in the broadcast channel table when the traffic arrives, and separating the communication traffic into the communication traffic if the channel is not registered;  A source monitoring unit for extracting traffic having a source address registered in the broadcast channel table from the traffic not separated into the communication traffic by the IPTV packet management unit; And By monitoring the bandwidth of the traffic extracted from the source monitoring unit, the traffic satisfying the bandwidth registered in the broadcast channel table is the IPTV traffic, and when it exceeds, only the traffic for the allocated bandwidth is transmitted as the IPTV traffic to the broadcast switch. IPTV service control device in the OLT, characterized in that it comprises a bandwidth monitoring unit. The method of claim 2, wherein the source monitoring unit, And discarding the source address of the IPTV traffic separated by the IPTV packet management unit if it is not the IPTV channel registered in the broadcast channel table. The method of claim 1, wherein the broadcast switch, The IPTV service control apparatus of the OLT, characterized in that the IPTV traffic transmitted from the room separator is buffered in one FIFO queue or a plurality of FIFO queues separated according to priority. According to claim 1, The multiplex multiplexing unit A first buffer for buffering IPTV traffic transmitted from the broadcast switch; A second buffer buffering communication traffic transmitted from the communication switch; And When the IPTV traffic is delivered to the first buffer, the IPTV traffic is switched to the first buffer to transmit buffered IPTV traffic to the external network, and when the communication traffic is delivered to the second buffer, the second buffer is switched to the second buffer to communicate the communication traffic. IPTV service control device in the OLT, characterized in that it comprises a multiplex switch for transmitting to the external network. (a) separating communication traffic and IPTV traffic from incoming traffic; (b) unicasting with reference to the routing table according to the destination address of the communication traffic separated in the step (a); (c) broadcasting the IPTV traffic separated in step (a) by first in, first out; And (d) transmitting the broadcast IPTV traffic or the unicast communication traffic according to the destination address to an external network. The method of claim 1, wherein step (a) (a1) if the destination address of the received traffic is not the destination address of the IPTV channel to be serviced, separating it into communication traffic; (a2) extracting traffic whose source address of the traffic not separated into communication traffic in step (a1) is a source address of the IPTV channel to be serviced; (a3) if the bandwidth of the traffic extracted in step (a2) satisfies the previously allocated bandwidth, the extracted traffic is regarded as the IPTV traffic; if the traffic is exceeded, only the traffic for the pre-allocated bandwidth is the IPTV traffic; IPTV service control method in the OLT comprising a. An input buffer unit which separates communication traffic and IPTV traffic when the traffic arrives, separates and separates the buffered communication traffic according to the destination address, and buffers the IPTV traffic fed back internally; A crossbar switch that unicasts separate buffered communication traffic according to the destination address and broadcasts the feedback IPTV traffic with reference to a routing table; And A multicast output buffer configured to buffer IPTV traffic separated from the input buffer unit and multicast feedback to the input buffer unit on a first-in first-out basis according to a switching operation of the crossbar switch; Each apparatus includes an output buffer unit including a plurality of output buffers for buffering the broadcast IPTV traffic or unicast communication traffic to the external network. The method of claim 8, wherein the input buffer unit Each of the first VOQs includes a first VOQ corresponding to each of the output buffers and a second VOQ corresponding to the multicast output buffer. Each of the first VOQs buffers communication traffic separated according to the destination address. It includes a plurality of input buffers for buffering the IPTV traffic; And And a multicast input buffer including a plurality of VOQs corresponding to each of the output buffers and multicasting IPTV traffic fed back from the multicast output buffers to the plurality of VOQs. Control unit. The method according to claim 8 or 9, A broadcast channel table storing information including a destination address, a source address, a bandwidth, and a priority for an IPTV channel; An IPTV packet management unit for checking whether a destination address of the received traffic is a channel registered in the broadcast channel table when the traffic arrives, and separating the communication traffic into the communication traffic if the channel is not registered;  A source monitoring unit for extracting traffic having a source address registered in the broadcast channel table from the traffic not separated into the communication traffic by the IPTV packet management unit; And Monitoring the bandwidth of the traffic extracted from the source monitoring unit to the traffic that satisfies the bandwidth registered in the broadcast channel table as the IPTV traffic, and if exceeded, only the traffic for the allocated bandwidth as the IPTV traffic to transmit to the broadcast switch IPTV service control device in the OLT, characterized in that it further comprises a bandwidth monitoring unit. The method of claim 8, wherein the crossbar switch, The IPTV service control device of the OLT, characterized in that for selecting the priority assigned to the IEEE 802.1p / q or the priority 1 for the IPTV traffic. (a) separating the communication traffic and the IPTV traffic when the traffic arrives; (b) separating and buffering the communication traffic separated in the step (a) according to the destination address again; (c) multicast-feedback by buffering the IPTV traffic separated in step (a) by first in, first out; (d) buffering multicast feedback IPTV traffic; (e) unicasting the separated buffered communication traffic according to the destination address with reference to the routing table, and broadcasting the buffered IPTV traffic in step (d); And (f) buffering the broadcast IPTV traffic or the unicast communication traffic and transmitting the buffered IPTV service in an OLT. The method of claim 12, wherein step (a) (a1) if the destination address of the received traffic is not the destination address of the IPTV channel to be serviced, separating it into communication traffic; (a2) extracting traffic whose source address of the traffic not separated into communication traffic in step (a1) is a source address of the IPTV channel to be serviced; (a3) if the bandwidth of the traffic extracted in step (a2) satisfies the previously allocated bandwidth, the extracted traffic is regarded as the IPTV traffic; if the traffic is exceeded, only the traffic for the pre-allocated bandwidth is the IPTV traffic; IPTV service control method in the OLT comprising a. The method of claim 12, wherein step (e) The IPTV service control method of the OLT, characterized in that for switching the IPTV traffic specified by the IEEE 802.1p / q priority or assigned to assign to priority 1.

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