Telephony radiotelephone

Title: Telephony radiotelephone
Category: Science & Technology
Details: Words: 2470 | Pages: 10.5 (approximately 235 words/page)

Telephony radiotelephone

RADIOTELEPHONE In addition to the wireline telephones described in The telephone instrument , there exist a number of wireless instruments that are connected to the public switched telephone network (PSTN). At the present time, these wireless telephones generally fall into one of three categories: cordless telephones, cellular radio systems, or personal communication systems. Eventually these systems will be expanded to include global satellite-based telephony. Cordless telephones. Cordless telephones are devices that take the place of a …showed first 75 words of 2470 total…

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…showed last 75 words of 2470 total…crosslinks,” thus permitting ready handoff between satellites when communicating with a fixed or mobile user on the Earth. The crosslinks would provide an uninterrupted communication path between the satellite serving a user at any particular instant and the satellite connecting the entire constellation with the gateway ground station to the PSTN. In this way the 66 satellites would provide continuous radiotelephone communication service for mobile and portable subscriber units around the globe. Copyright 1994-1999 Encyclopædia Britannica

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