| 摘要 |
<p>PURPOSE:To attain remote monitor from a remote location of a multiplex communication equipment by providing a clock out of synchronism detection circuit, a clock supply device operation monitor signal extraction circuit and a CPU bus interface circuit. CONSTITUTION:The clock interface circuit 4 of a time division multiplexer 2 is provided with a clock out of synchronism detection circuit 11 detecting out of synchronism between a clock from a line in the circuit and a clock from a clock supply device 5 and a clock supply device operation monitor signal extraction circuit 14 extracting the operation monitor signal of the clock supply device 5. Then a CPU bus interface circuit 15 to apply remote monitor to the output signal of both the circuits 11, 14 at a remote location via a CPU bus is provided. Thus, the operating state of the clock supply device is controlled remotely by the communication network management system comprising the time division multiplexer.</p> |
