| 摘要 |
PROBLEM TO BE SOLVED: To prevent the functions of the system from being considerably lost even on the occurrence of a fault in a Cch approach line in the radio system of a trunking method where a line controller and a base station equipment are connected by the approach line. SOLUTION: Relays 9, 10, 11, 12 are provided to outputs of Cch line I/F and a Cch-e line I/F in each of a line controller and a base station equipment, and on the occurrence of a fault in the Cch approach line, a monitor controller detects the fault to control the relays 9, 10, 11, 12 to be switched. Thus, a Cch signal is sent via the approach line used usually for the Vch-1 and the reliability of the system is improved. |
