The basic principles of CT2/CAl operation offer significant opportunities to minimise the inherent cost of the basic digital link. For example the 100 kHz channelling does not require time dispersion equalisation even when operating in a multipath environment with no line-of-sight signal component. Furthermore there is no need for a radio frequency duplexer and less carrier frequency sources are required. From a speech transmission point of view the moderate processing delays involved do not require echo control circuitry or raise absolute network delay issues. With these benefits the radio circuit design is simplified and the complexity of implementation is concentrated at baseband which can made using low power consumption, large scale integration CMOS technology.
Figure 49.7 is an example of the degree of integration that is possible and which leads towards a common set of components to support all applications. This is a key objective in realising the benefits of large volume production in terms of minimised component costs.
Exercise 1 Learn the following words and word combinations