| 摘要 |
PURPOSE: To improve a channel efficiency by using an idle channel in the case of data transmission through the connection of a semi-duplex terminal equipment to a full duplex channel. CONSTITUTION: A semi-duplex FAX terminal equipment 4 is connected to a radio transmission reception system 10 of a digital cellular phone of a full duplex channel via a data adaptor 41. A data monitor addition data insertion circuit 45 is provided to monitor the full duplex channel and when FAX data are sent through one of the full duplex channels, additional data are sent through the other of the full duplex channel. Furthermore, an additional data detection extract circuit 44 is provided to detect and extract additional data sent from an opposite party of the similar configuration. |
