SYNCHRONISATION OF VODSL FOR DSLAM, CONNECTED TO ETHERNET ONLY Russian patent published in 2009 - IPC H04J3/06 

FIELD: information technology.

SUBSTANCE: invention relates to POST synchronisation, transferred over DSL, i.e. for VoDSL, DSL, receiving data from a packet transmission network, more specifically ETHERNET. A retransmission unit, such as DSLAM, receives Ethernet packets and retransmits information in them over a digital subscriber line. To retransmit voice data of the received Ethernet packets, a reference clock signal is generated by a synchronising device and transmitted to digital subscriber line modems. The synchronising device comprises an extraction unit for selecting at least one stream of received Ethernet packets, and a unit for generating the clock signal, configured as an adaptive synchronisation unit for generating a reference clock signal in accordance with the arrival time of a packet in the selected stream or streams of packets. The reference clock signal can be transmitted to time referencing units in modems. The extraction unit can analyse reception of Ethernet packets so as to find packet streams from a single user transfer target, each packet in the stream carries information in real time, belonging to a service in real time, and then select one or more streams, which should be used by the adaptive synchronisation generator.

EFFECT: more accurate synchronisation.

14 cl, 19 dwg