| 摘要 |
PURPOSE:To prevent a line from being broken through squelch operation even when a power supply of a communication control section of the recovery relay station due to maintenance or repair or the like is interrupted by providing a re-addition function of a line identification code in a recovery relay station. CONSTITUTION:An identification code detector 33 in a recovery relay station B detects an identification code in an input control signal usually and gives its detection signal to an identification code generator 34 to inactivate the generator 34. Thus, a control signal with an identification code added thereto from a communication control section 31 is multiplexed on a main signal and the result is sent to a succeeding station via an antenna 35. However, in this case, since the detector 33 detects the absence of the input of the identification code, the code generator 34 is operated to provide an output of the identification code. The code is multiplexed on the main signal and the result is sent from the antenna 35. Thus, even when a power supply of the communication control section 12 or 31 is interrupted, since the identification code is sent, squelch operation of succeeding stations to the relay station B is prevented. |
