| 摘要 |
PROBLEM TO BE SOLVED: To reduce the price of connected transmission lines between a control station in TDMA/TDD mobile communication such as PHS and plural terminal base stations conneced to the control station. SOLUTION: Single direction transmitting optical fibers 25, 26 are prepared as transmission lines between a terminal base station 60 and a control station 70. Switches 21, 23, 28, 30 are connected like solid lines in a TDMA transmitting frame and switched like dotted lines in a receiving frame. A control signal and a monitor signal are transferred by the counter transmission line of the transmission line of transmitting/receiving data time-dividedly transmitted alternately through the fibers 25, 26. Consequently the number of optical fibers can be reduced from conventional four fibers to two fibers. |
