| 摘要 |
<p>PURPOSE:To attain the test of a line by detecting whether or not a data number in a synchronizing buffer exists between an upper limit and a lower limit value. CONSTITUTION:In testing a line between nodes ND-A and ND-B, an output and an input of a terminal DTEb side of the node ND-B are connected, the test data is transmitted from a terminal DTEa connected to the node ND-A and the terminal device DTEa receives the test data. That is, a loopback line is formed for the test. The test is conducted by the test system like this and the data number in the data speed adjustment buffer built in a multiplex MXa of the node ND-A side is checked to check the operating state of a loopback line.</p> |
