Abstract: A multiple access asynchronous network segment for providing network access to a plurality of end systems over a shared medium uplink to a satellite headend supported by a network controller, wherein the network controller allocates part of the uplink resource and the satellite headend allocates part of the uplink resource on a temporary basis in response to end systems making a new request for uplink resource. Also provided is a signalling system for use in a multiple access asynchronous network segment for providing network access to a plurality of end systems over a shared medium uplink to an intermediate. Also provided is an Integrated Addressing and packet Segmentation And Reassembly (IASAR) system for use in a multiple access asynchronous network segment for providing network access for a plurality of end systems to an intermediate system over a shared medium.