| 摘要 |
PURPOSE:To conduct efficient loopback test by storing information relating to a clock source of data transmission in a network so as to switch the synchronizing timing of data transmission based on the information. CONSTITUTION:A command signal from a MODEM 221 is synchronous with a clock source 223 and sent to a MODEM 251 via MODEMs 231, 241. In receiving the command signal sent from the MODEM 221, a main control section 321 reads clock source information stored in a clock information storage section 311 and changes the timing for the modulation implemented synchronously with a synchronizing signal 343 generated from an extracted clock signal 353 extracted by a demodulation section 351. |
