Personal Wireless Communication with DECT and PWT by John Phillips

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By John Phillips

A consultant to the factors for electronic stronger cordless telecommunications (DECT) and private instant telecommunications (PWT). It covers history fabric and technical rules, easy protocols and implementations, plus gains at the wide variety of purposes. It indicates: the easiest how you can enforce DECT and PWT for personal indoor speech and knowledge platforms, in addition to for out of doors public entry telephony; the right way to practice the factors robustly; the technical requisites of the Federal Communications fee and the technical rules crucial for gaining sort approval in response to the newest eu Union Directives; and the way to spot and take the precise steps to lessen the potential of operational failure in multi-vendor environments.

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The first level of security, therefore, lies in the protocols that require mutual recognition before the handset is allowed to use the telephone line. The physical security of the base station prevents anyone else from registering another handset with it so you cannot just take an ordinary DECT or PWT handset and use someone else’s line without physical access to their base station. 2 Telephone Systems for Small Businesses A small business telephone system may have only a few more features than a residential cordless telephone.

8 Channel Coding and Signaling Once the frame structure has been decided, it is necessary to decide the structure of individual channels, especially the signaling and control channels. One of the key decisions made on the DECT interface was to preface each transmission of user data with a header of synchronization and signaling data, which serves two purposes: • To allow the handset and base station to regularly synchronize to each other; • To transfer control information. The header is overhead information, a necessary evil that occupies bandwidth that could otherwise be occupied by user traffic.

The range of applications is outlined here and covered more extensively in Chapter 8. 1 Residential Telephones A residential cordless telephone system is probably the simplest possible cordless system. In many cases, it is just a single telephone handset and a single base station connecting to an external telephone line. The coverage area depends on local conditions but could be up to 200m or so in open-plan conditions, down to 50 m or so in offices with metallic partition walls. An Introduction to DECT and PWT 13 The system is quite secure.

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