Cordless Pabx Using Scanning Unoccupied Channel Technique

Abstract

This paper presents the design of the cordless PABX using scanning unoccupiedchannel technique for 4 external lines and 16 internal lines, performed by using FSKmodulation at asynchronous transmission data rate between the switching base unit toportable units is 300 (baud rate). A full duplex transceiver uses the frequency rang of47 MHz and 72 MHz bands, by scanning an unoccupied channel for the conserve ofradio frequencies.