| 摘要 |
<p>A cordless telephone system of the type comprising a plurality of telephone handsets communicating by two-way radio with a base unit connected to the public telephone network. In the larger premises, normally a plurality of spaced base units are employed, so that the handsets can communicate with the most favourably-positioned base unit wherever they are on the premises. In the present invention, however, larger premises are covered by just a single base unit (1), including within it all the necessary transceivers (7) together with a plurality of transponders (3, 4, 5) which are connected to the base unit and each other by means of an RF cable. The transponders each have aerials by which they can communicate by two-way radio with the handsets. The transponders downconvert the RF frequency of the radio link to a lower IF frequency which is passed to the transceivers (7) via the cable (6). The transponders (3, 4, 5) can be distributed about the premises as needed to provide complete radio coverage.</p> |
