routing layer in a software architecture protocol stack u201d the transceiver is specified in such a way that different radio spectra and standards may be supported at the physical layer without changing the basic link layer and routing software the transceiver 40 includes a network interface ni which is a computer industry standard such as ieee 802 ethernet or pcmia the sole purpose of the ni is to support communications with software application components in the terminal or the networking components in the gateway the user terminal 34 fig1 consists of a transceiver 40 and an application processor such as a notebook computer or personal digital assistant pda the application processor provides the user interface and software applications that make use of the underlying transport the user terminal likely has a limited battery based power supply a router 36 fig1 consists of a transceiver 40 with a permanent power supply the router has specific functions in the deployment of a network as described hereinbelow a gateway 38 fig1 consists of a transceiver 40 and a physical connection to the wide area network wan of the gateway controller 32 it is possible to distribute the functions of the gateway controller to the gateways the gateway controller 32 aggregates a number of ad hoc gateways 38 and provides common services such as interworking gateways billing provisioning and other administration functions for a complete network fig1 the gateway controller 32 consists of an home location register hrl or name server 50 media resource manager mrm 52 which includes hardware such as voice mail recorded messaging such as all circuits busy etc network operation center.