H OTS POT GATEWAY6 IntroductionBilling EnablementThe HSG supports billing plans using credit cards, scratch cards, or monthlysubscriptions, and can base the billable event on a number of different parameterssuch as time, volume, IP address type, or bandwidth.Access Control and AuthenticationThe HSG ensures that all traffic to the Internet is blocked until authentication has beencompleted, creating an additional level of security in the network. Also, allowsHotSpot operators to create their own unique “walled garden,” enabling users toaccess only certain predetermined Web sites before they have been authenticated.Nomadix simultaneously supports the secure browser-based Universal AccessMethod (UAM), IEEE 802.1x, and Smart Clients for companies such as AdjungoNetworks, Boingo Wireless, GRIC and iPass.