l Telecom Business But some problems may never be solved. How to differentiate between 'eight' and 'eat', spoken by people with strong dialects? Human output function is used to provide output to human beings. These outputs are tailored to the needs and tastes of human end users. Examples of human output are audio output on a phone, graphics display of an area, video of a location. 10.1.3 M2M FUNCTIONS M2M requires a conversion between machine to digital value and a conversion in the reverse direction. The first one is called machine input function (MIF) and the second one is called machine output function (MOF). Machine input function is used to read input from machines. MIF and MOF are tailored to the machines and their behaviour. MIF converts physical properties like temperature, an optical scene, voltage into understandable digital values. MOF converts the digital information into physical properties like temperature. MIF and MOF can be implemented in hardware, software, firmware or a combination of these. Examples of MIF are smoke detector sensors and pressure sensors. Examples of MOF are closing a valve, toggling a switch, raising an alarm. 10.1.4 SUMMING UP IMPORTANT TERMINAL PARAMETERS What hardware (desktop, laptop, mobile, handheld)? What operating system (Palm, Microsoft XP 2000, Linux, Symbian, Windows CE.)? An operating system may contain many communication and security functions. Encryption may be used much more. What program language, for example Java? What access method(s) to the network? Access to other devices? Bluetooth, Infrared? Number of bands in the device? Automatic device configuration and single sign-on? Ring signals? What application(s)? Internal resources will be controlled via API interfaces from the applications. What service enablers? What man-machine interface (or machine-machine)? Display size? Voice control? What security properties and risks? Chapter 6, section 6.3.1 offers an overview. 10.2 BUSINESS ASPECTS The capabilities, design and usefulness of terminals/devices are increa