# US 7,610,608 B2 · Digital broadcast system in passive optical network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,608 B2 - Document ID: US7610608B2 - Status: Granted - Kind: B2 - Application number: 10/739,236 - Filed: 2003-12-17 - Published: 2004-07-08 - Granted: 2009-10-27 - Earliest claimed: 2002-12-18 - Assignees: Electronics and Telecommunications Research Institute - Inventors: Yongtae Kim; Kang Bok Lee; Heyung Sub Lee; Hyeong Ho Lee - Web page: https://patentgrep.com/patent/US7610608B2 ## CPC - H04N 21/4405: involving video stream decryption - H04N 7/17318: {Direct or substantially direct transmission and handling of requests} - H04N 21/2347: involving video stream encryption - H04N 21/235: Processing of additional data, e.g. scrambling of additional data or processing content descriptors - H04N 21/435: Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream - H04N 21/4622: {Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet (web site content organization and management for information retrieval from the Internet G06F16/958; transmission by internet of broadcast information H04H60/82; stock exchange data over packet-switching network H04L12/1804; push services including data channel over packet-switching network H04L12/1859)} - H04N 21/47202: {for requesting content on demand, e.g. video on demand} - H04N 21/4782: Web browsing {, e.g. WebTV} - H04N 21/6125: {involving transmission via Internet (transmission by internet of broadcast information H04H60/82)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Provided is a digital broadcast system that receives digital broadcast services on a passive optical network (PON). The data separator separates a signal input thereinto from the outside into an Ethernet frame for data service and an Ethernet frame for digital broadcast service. The Ethernet switch transmits the Ethernet frame for data service to an optical network terminal (ONT) provided in the user's home according to header information of the Ethernet frame for data service. The channel request processor receives the user's channel selection request information and user identification (ID) information from the ONT. The digital broadcast processor transmits the Ethernet frame for digital broadcast service, corresponding to the digital broadcast channel selected by the user, to the user's ONT, by using a part of bandwidth assigned for an existing line. ## Claims ### Claim 1 A digital broadcast system, comprising: a digital broadcast output unit which transmits a plurality of digital broadcast channels that has been multiplexed and encrypted in an Ethernet frame form, via an optical line terminal (OLT) on an Ethernet passive optical network (E-PON); and a plurality of optical network units (ONUs) which provide one of the digital broadcast channels to a user in response to a user channel selection, by using a part of bandwidth assigned for an existing line, wherein each ONU comprises: a digital broadcast processor which receives an MPEG stream containing all of the digital broadcast channels transmitted from the digital broadcast output unit over the E-PON, demultiplexes a plurality of Ethernet frames corresponding to all of the of the digital broadcast channels, and transmits, in response to the user's channel selection, one of the demultiplexed Ethernet frames that is corresponding to the digital broadcast channel selected by the user, to the user's optical network terminal (ONT); and an Ethernet switch to transmit the Ethernet frame for the digital broadcast channel to an ONT provided at a location of the user, wherein the digital broadcast processor further comprises: an Ethernet frame generator, in response to the user channel selection, to encapsulate the MPEG stream corresponding to the digital broadcast channel selected by the user in the Ethernet frame for the digital broadcast channel and to include the user's address as a destination address. ### Claim 2 (depends on 1) The digital broadcast system of claim 1, wherein the ONU comprises: a data separator which receives a signal input to the ONU and separates the signal into an Ethernet frame for data service and an Ethernet frame for digital broadcast service; the Ethernet switch which transmits the Ethernet frame for data service to the optical network terminal (ONT) provided in the user's home according to header information of the Ethernet frame for data service; and a channel request processor which receives the user's channel selection request information and user identification (ID) information from the ONT. ### Claim 3 (depends on 2) The digital broadcast system of claim 2, wherein the ONU upwardly interfaces with the digital broadcast output unit on the Ethernet-passive optical network (E-PON) and downwardly interfaces with a plurality of ONTs on an Ethernet network. ### Claim 4 (depends on 2) The digital broadcast system of claim 2, wherein the data separator is a wavelength division multiplexing (WDM) filter which separates the input signal into the Ethernet frame for data service and the Ethernet frame for digital broadcast service using a WDM technique. ### Claim 5 (depends on 2) The digital broadcast system of claim 2, wherein the digital broadcast processor comprises: a demultiplexer which demultiplexes the plurality of Ethernet frames for digital broadcast service of different channels; a tuner which transmits the demultiplexed Ethernet frame corresponding to the channel selected by the user to a port dedicated for each of the ONTs based on the channel selection request information and the user ID information; and the Ethernet frame generator which generates the Ethernet frame for digital broadcast service having the user's address as the destination address by encapsulating the data transmitted by the tuner. ### Claim 6 (depends on 2) The digital broadcast system of claim 2, wherein the ONT is connected to a data processor which provides a data service to the user in response to the reception of the Ethernet frame for data service, and a set-top box which provides a digital broadcast service to the user in response to the reception of the Ethernet frame for digital broadcast service. ### Claim 7 (depends on 1) The digital broadcast system of claim 1, wherein the digital broadcast output unit transmits entire digital broadcast channel data to the ONU via an IP network or a leased line. ### Claim 8 (depends on 7) The digital broadcast system of claim 7, wherein the digital broadcast output unit transmits the entire digital broadcast channel data to the ONU via the IP network using a multi-protocol label switching (MPLS) technique, which is capable of guaranteeing quality-of-service (QoS). ### Claim 9 An optical network unit (ONU), comprising: a data separator which receives a signal input to the ONU and separates the signal into an Ethernet frame for data service and an Ethernet frame for digital broadcast service; a channel request processor which receives, by using a part of bandwidth assigned for an existing line, a user's channel selection request information and user identification (ID) information from an optical network terminal (ONT) provided in the user's location; a digital broadcast processor which receives an MPEG stream containing all of the digital broadcast channels transmitted from a remote digital broadcast output unit over an Ethernet-passive optical network (E-PON), demultiplexes a plurality of Ethernet frames corresponding to all of the of the digital broadcast channels, and transmits, in response to the user's channel selection, one of the demultiplexed Ethernet frames that is corresponding to the digital broadcast channel selected by the user, to the user's ONT; and an Ethernet switch which transmits the Ethernet frame for the digital broadcast channel selected by the user to the user's ONT according to header information of the Ethernet frame; and wherein the digital broadcast processor further comprises: an Ethernet frame generator, in response to the user channel selection, to encapsulate the MPEG stream corresponding to the digital broadcast channel selected by the user in the Ethernet frame for the digital broadcast channel and to include the user's address as a destination address. ### Claim 10 (depends on 9) The ONU of claim 9 upwardly interfaces with the digital broadcast output unit on the Ethernet-passive optical network (E-PON) and downwardly interfaces with a plurality of ONTs on an Ethernet network. ### Claim 11 (depends on 9) The ONU of claim 9, wherein the data separator is a wavelength division multiplexing (WDM) filter which separates the input signal into the Ethernet frame for data service and the Ethernet frame for digital broadcast service using a WDM technique. ### Claim 12 (depends on 9) The ONU of claim 9, wherein the digital broadcast processor comprises: a demultiplexer which demultiplexes the plurality of Ethernet frames for digital broadcast service of different channels; and a tuner which transmits the demultiplexed Ethernet frame corresponding to the channel selected by the user to a port dedicated for each of the ONTs based on the channel selection request information and the user ID information. ### Claim 13 (depends on 9) The ONU of claim 9, wherein the ONT is connected to a data processor which provides a data service to the user in response to the reception of the Ethernet frame for data service, and a set-top box which provides a digital broadcast service to the user in response to the reception of the Ethernet frame for digital broadcast service.