| 摘要 |
Both call switching communication and packet communication are achieved by one personal communication device. Misreceiving in the personal communication device usable in two communication modes is prevented. The personal communication device has a call switching modem and a packet switching modem. The former is used for AMPS network, and the latter for CDPD network. A telecommunication system includes a transmission/receiving terminal and a telecommunication network. The packet switching modem of the terminal awaits the receiving and initial transmission. In this system, the transmission terminal first sends a CDPD packet to the receiving terminal. The receiving terminal is informed of a request for call switching communication. The receiving terminal sends back a response to the request as a CDPD packet, and then a call in the AMPS network is made. Although the personal communication device is usable in the two modes, misreceiving does not occur because awaiting is in a fixed mode.
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