| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct diffusion type radio communication system which enables each extension and an ISDN line to communicate, without hardly being affected by interfering electric waves. SOLUTION: A master set 10 which is connected to an ISDN line having plural channels and plural slave sets 32 and 44 which communicate with the set 10 by radio, perform two-way communication in a time-division system and also a direct diffusion system. In such cases, a diffusion code which is used in master-slave unit communication and a diffusion code which is used in slave-slave unit communication are different from each other. Therefore, they can be used in the same frequency band. |
