| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that an SF synchronization signal line used as a transmission line of an SF synchronization signal distributed from a main control unit to each radio terminal interface not only lacks flexibility but also is excessive and uneconomical, with respect to a change in the number of the radio terminal interfaces to be mounted when a radio terminal interface connected to a radio terminal such as a PHS system in a private branch exchange. SOLUTION: An SF synchronization signal generated in an SF synchronization generator 12 is superimposed on the predetermined bit position of downstream data of a PCM-HW 3 to each radio terminal interface 2 transmitted from a PCM-HW signal generator 11 in a main control unit 1 by an SF synchronization signal superimposing section 13, and the superimposed signal is transmitted to the PCM-HW 3. The radio terminal interface 2 separates the SF synchronization signal from a predetermined bit position of downstream data, thereby receiving the signal. Thus, the SF synchronization signal is eliminated. COPYRIGHT: (C)2006,JPO&NCIPI
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