 can produce up to 500 watts. APCO is unusual in that it is standard developed by a specific user community, the Association of Public Safety Communication Officials. Table 16.1 summarises some typical traditional specialist user needs. From the above, it can be seen that it is not always easy to move users from a two-way radio system onto a cellular system and provide them with sufficiently equivalent functional capabilities. The attempted migration of Sprint Nextel iDEN users to Sprint CDMA a few years ago is a legacy example of some of the challenges inherent in this process. 16.3 Impact of Cellular on Specialist User Expectations Conversely, much of the functionality that we take for granted in cellular handsets, particularly multimedia functionality and the data rates needed to support the real-time exchange of Satellite Networks multimedia content is either not available in a two-way radio or commands a substantial cost premium and/or weight and size and/or duty cycle penalty. Not all specialist users need or want multimedia capabilities in their handsets, but some do and this present minority will likely increase over time. Multimedia functionality implies audio and video capture bandwidth using high resolution cameras and high resolution display bandwidth using high-resolution displays. These functions are only immediately useful matched with efficient high data rate uplink and downlink radio bearers. It is not impossible to deliver adequate data rates over two-way radio systems. There are wider-band implementations of two-way radio systems potentially capable of meeting multimedia specialist user expectations but substantial engineering effort and investment will be needed to make the handsets and networks work efficiently. The narrowband technologies are optimised for voice or low bit rate data SO are inherently unsuitable for real-time multimedia. These narrowband systems are spectrally efficient but this is of marginal relevance to most specialist end users. We can illustrate these practical data rate