摘要 |
PROBLEM TO BE SOLVED: To shorten the test time of an EOC loop back test. SOLUTION: A telephone exchange station 1 is connected with a radio base station 3 and a terminal base station 9 is connected with an ISDN terminal 10 by a wire circuit. The radio base station 3 is connected to the terminal base station 9 by a radio line. The same message is continuously transmitted three times through the wire circuit. When the radio base station 3 receives three EOC messages (1), (2) and (3), it transmits the EOC message once (step 303). When the terminal base station 9 receives the three echo messages (1), (2) and (3), it transmits the echo message once (step 310). Through the wire circuit, the message is transmitted only once and an EOC loop back test is started by a loop back data signal 311. |