| 摘要 |
PURPOSE:To apply an automatic switchboard which tests a an accounting pulse sending function to a toll switchboard equipped with a network through which DC signal transmission is impossible, by transmitting an audible signal tone to a testing device synchronously with accounting pulses. CONSTITUTION:In an automatic switchboard which connects an incoming trunk ICT to a testing device through a testing outgoing trunk and a network to test an accounting pulse sending function provided to the incoming trunk ICT, the testing trunk is provided with a means MP which detects accounting pulse transmitted from the incoming trunk ICT, and transmit an audible signal tone to the testing device TST through the network synchronously with the accounting pulse In the testing device TS, an audible signal tone detecting circuit DET2 is provided to its speech line to detect the audible signal tone from a testing outgoing trunk TOGT1, turning on a lamp LP. |
