Abstract: The present invention relates to methods and arrangements for access control in a multicast system when data is distributed from a source VS on a common link L3 to at least two users U1-U12 via a node BN21 that comprises a request arbiter ARB21. The arbiter is arranged to distribute the data from source to the users. The method comprises the following steps: —A weight is assigned to each user U1-U12 associated with the node BN21. The weights determine each user's allowed bandwidth i.e. bandwidth allowed to use out of available bandwidth on the common link L3. —A request to join a multicast session S81 is received to the node BN21 from a user U1. —Actual bandwidth usage by the user U1 calculated as the sum of the user's bandwidth part of each used session on the common link L3 including the new request, is compared in the node BN21 with the users U1 allowed bandwidth. —The request denied if the available bandwidth is lower than the actual bandwidth.

Abstract: The present invention relates to methods and arrangements for access control in a multicast system when data is distributed from a source VS on a common link L3 to at least two users U1-U12 via a node BN21 that comprises a request arbiter ARB21. The arbiter is arranged to distribute the data from source to the users. The method comprises the following steps: —A weight is assigned to each user U1-U12 associated with the node BN21. The weights determine each user's allowed bandwidth i.e. bandwidth allowed to use out of available bandwidth on the common link L3. —A request to join a multicast session S81 is received to the node BN21 from a user U1. —Actual bandwidth usage by the user U1 calculated as the sum of the user's bandwidth part of each used session on the common link L3 including the new request, is compared in the node BN21 with the users U1 allowed bandwidth. —The request denied if the available bandwidth is lower than the actual bandwidth.

Abstract: The present invention relates to an arrangement for providing communication between end users, and/or end users and service providers, over an access network supporting communication of packet data in frames according to Ethernet technology. It comprises means for, at least for establishment of a packet connection between an end user and a service provider, encapsulating packets arriving at an ingress point substantially unmodified in another, new transport frame. Said transport frame is provided with an identification, e.g. a combination of origination address and destination address information of said frame, which combination is unique for the connection, and the access network supports transport of jumbo frames, such that a new transport frame may comprise a jumbo frame.

Abstract: A point-to-multipoint network includes a central node and a plurality of terminals connected to the central node via a transmission medium. The central node transmits frames of data downstream to said terminals in timeslots, and said terminals transmit data packets upstream in timeslots allocated by transmission permits contained in the downstream data. When transmitting a transmission permit to a terminal the central node reserves a time period in the future downstream data stream during which data destined for the terminal will be blocked from transmission. The reserved time period commences at a time location in the future data stream and has a duration, such that data transmitted to the terminal in a timeslot immediately following the reserved time period will arrive at said terminal after the same has terminated transmission of data in response to the permit. This reliably ensures that a terminal will not transmit and receive data simultaneously.