Modern data communication systems are mobile and make users mobile: Stationary solutions, from modems to routers, can be added to any wired network. Mobile solutions free users from being dependent on a location - whether the field devices are always moving, or they change site only infrequently, or the application is intended to run in parallel with the existing IT structure. Typical Application Remotely access controllers Remotely query data loggers Send alarms to indicate problems Remote switching Change protocols Log data Monitor sensors Optimise processes Update software remotely Remote maintenance