Communications System, Method for Controlling a Communications System, Network Access Device and Method for Controlling A Network Access Device

摘要

Communications system having first, second, and third communications networks, a subscriber device, and a network access device having a network layer address. The network access device permits access by the first communications network to the third communications network and access by the second communications network to the third communications network. There is a communications link between the subscriber device and the third communications network via the first communications network and the network access device, wherein the network layer address is used during the transmission of data via the first communications link. The network access device has a control device that releases the first communications link and sets up a second communications link between the subscriber device and the third communications network via the second communications network and the network access device. The network layer address of the network access device is used during the transmission of data via the second communications link.