fully technical characteristics of the UK version of this analogue CT are mobile cellular radio service. However, its analogue nature and, in as follows: its more successful form, limited traffic carrying capabilities se- verely limited its full development potential. What was needed was 1. Eight analogue FM channel pairs operating around 1.7MHz a ubiquitous technology that could be exploited widely in the home, and 47.5MHz. office and factory, in such numbers that all could benefit from the 2. Radiated power limited to 10mW maximum. economies of scale that mass uniform production can provide. The 3. Choice of channel pair is set at manufacture but random at time new generation needed the characteristics as in the following sec- and place of purchase. Line access and incoming call security tions. by a handshake process involving at least 60000 randomly selected binary codes. 49.2.1 Areas of application Products to this enhanced specification have been freely available 1. Residential, private use in houses and apartments. in the UK since 1983. In France different frequencies were adopted 2. Small CT systems for office use. 49/4 Cordless telecommunications 3. Large CT systems, multi-cell private switch telephony based 1. CT2/CAI; which translates to second generation CT with a building mobile systems with roaming and in-call handover Common Air Interface (ETSI, 1991). between cells (the so-called cordless business communications DECT; which means Digital European Cordless Telecommuni- system, CBCS). cations (ETSI, 1992b). 4. Radio access to local public and other telecommunications networks, e.g. telepoint systems. The key factor in both standards, however, is that they offer a common air interface specification. This means that each can sup- The CBCS opens the opportunity towards the cordless office with port a public access voice service in which the handset and base greater freedom to rearrange office space as work demands. This is station may be manufactured by different companies and yet still a result of redu