March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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Once the call is terminated, the mobile returns to its idle state, monitoring the paging channel for
any requests that may appear. It may also send an access request if it is required to initiate a call.
Vocoders
There are three main vocoders used in cdmaOne. The first to be launched, known as the 8-K
vocoder, operated at 8 kbps. This did not give a particularly good voice quality in view of the
limited number of bits available, but it did make goo d use of the available capacity, thereby
allowing operators to carry more calls. In view of the voice quality, another vocoder, the 13-K
vocoder operating at 13 kbps, was introduced. This provided far
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