1. Method for network analysis in an access network in connection with a data transmission network, in particular an xDSL network, with a plurality of subscriber lines, the method comprising the step of collecting data on physical layer operational parameters of at least one subscriber line, wherein the method further comprises the steps of: (a) simulating a behaviour of higher network layers based on said collected data when deploying at least one application on said subscriber line; (b) generating simulation data on higher layer performance parameters for said application; and (c) generating an advice signal based on said simulation data and indicative of the compatibility of the physical layer/application couple with predetermined Quality-of-Service requirements for said application.