# US 8,787,409 B2 · Method for discontinuously transferring data in a point-to-multipoint access network, central unit, and network termination unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,409 B2 - Document ID: US8787409B2 - Status: Granted - Kind: B2 - Application number: 13/322,181 - Filed: 2010-05-06 - Published: 2012-05-17 - Granted: 2014-07-22 - Earliest claimed: 2009-06-10 - Assignees: Alcatel Lucent - Applicants: Heinz-Georg Krimmel - Inventors: Heinz-Georg Krimmel - Web page: https://patentgrep.com/patent/US8787409B2 ## CPC - H04L 1/0041: {Arrangements at the transmitter end} - H04M 11/062: {using different frequency bands for speech and other data} - H04Q 11/0067: {Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring} - H04L 2001/0093: {Point-to-multipoint} - H04Q 11/0071: {Provisions for the electrical-optical layer interface} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract An exemplary method and apparatus are provided for transferring data from a central unit in a network to a subscriber-sided network termination unit via a distribution network that connects the central unit with the subscriber-sided network termination unit and multiple of other subscriber-sided network termination units. Measures for providing correct data transmissions, such as scrambling or forward error correction, are applied to the data for the single subscriber-sided network termination unit before the data are combined with data for other subscriber-sided network termination units. As a consequence, there is no longer a need to completely process the transferred data at each and every subscriber-sided network termination unit. ## Claims ### Claim 1 A method for transferring data from a central unit in a network to a subscriber-sided network termination unit via a distribution network that connects the central unit with the subscriber-sided network termination unit and multiple of other subscriber-sided network termination units, comprising: encoding individually multiple independent data input streams at the central unit; channel framing each of the individually encoded multiple independent data input streams after the encoding at the central unit; and performing, on each of the channel framed multiple independent data input streams individually at the central unit, scrambling and forward error correction prior to the combination of the multiple data input streams. ### Claim 2 (depends on 1) The method according to claim 1, wherein the network is a passive optical network. ### Claim 3 (depends on 1) The method according to claim 1, wherein the central unit is an optical line termination. ### Claim 4 (depends on 1) The method according to claim 1, wherein the subscriber-sided network termination is an optical network termination unit. ### Claim 5 A central unit for a point-to-multipoint access network with the central unit, a distribution network and a multiple of subscriber-sided network termination units, comprising: a transmission function means adapted to scramble data and provide forward error correction during a transfer of encoded data; and a multiplexer adapted to combine data for a subscriber-sided network termination unit with data for other subscriber-sided network termination units; wherein the transmission function means and the multiplexer are arranged in such a consecutive manner that the scrambling and forward error correction of the data for the subscriber-sided network termination unit are carried out prior to data input to the multiplexer. ### Claim 6 (depends on 5) The central unit according to claim 5, wherein the multiplexer is adapted to combine the data for the subscriber-sided network termination unit with the data for the other subscriber-sided network termination units after the data for the subscriber-sided network termination unit has been scrambled and forward error correction encoded and after the data for the other subscriber-sided network termination units has been scrambled and forward error correction encoded. ### Claim 7 A subscriber-sided network termination unit of a passive optical network, the subscriber-sided network termination unit comprising: at least a first part adapted to receive scrambled and encoded data from a central unit, wherein the received data was scrambled and forward error correction encoded at the central unit prior to being multiplexed and transmitted with other signals; and at least a second part separate from the at least first part, wherein the at least second part includes a clock adapted to control the operation of the at least first part. ### Claim 8 (depends on 7) The subscriber-sided network termination unit according to claim 7, wherein the first part is adapted to perform such functions that relate to transmission function measures for serving a transfer of data for the subscribe-sided network termination unit, and wherein the functions include the scrambling and the forward error correction encoded. ### Claim 9 (depends on 7) The subscriber-sided network termination unit according to claim 7, wherein the at least first part is adapted to operate only when data arrives at its input. ### Claim 10 (depends on 9) The subscriber-sided network termination unit according to claim 9, wherein the clock is adapted to maintain synchronization when the at least first part does not receive data.