Northern Telecom Limited

David Choi

Kishore John Raj

A radio terminal interface includes a signal processor and a controller. The signal processor has a TDMA mode of operation and an AMPS mode of operation. The controller composes signals for registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal interface in a cellular radio system. The controller also identifies page requests received while the radio terminal interface is in an idle state, and responds to received page requests specifying the first MIN by composing page responses specifying the first MIN. The controller responds to received page requests specifying the second MIN by composing page responses specifying the second MIN. The controller responds to initial traffic channel designation messages received by the radio terminal interface by configuring the signal processor in its TDMA mode, and responds to initial voice channel designation messages by configuring the signal processor in its AMPS mode. The controller responds to a dialling sequence by composing service requests, the service requests specifying the first MIN when the dialling sequence does not contain a predetermined dialling sequence, and specifying the second MIN when the dialling sequence does contain the predetermined dialling sequence. The radio terminal interface can be used to ensure that voice-band data calls (e.g. facsimile transmissions) are assigned AMPS channels by dual-mode cellular radio systems.

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Kanata, Canada

David Choi