| 摘要 |
<P>PROBLEM TO BE SOLVED: To cut off an unnecessary alarm notification at clock interruption. <P>SOLUTION: A network synchronization system shelf comprises: a clock input receive unit for receiving a clock signal fed into the system shelf; a clock output unit for outputting a clock signal; a clock interruption detection unit which detects clock interruption when the clock input receive unit did not receive a clock; an AIS signal detection unit which detects an AIS signal when an AIS signal is received via the clock input receive unit; an AIS signal generation unit which generates an AIS signal; an alarm control unit which outputs a prescribed alarm notification when the AIS signal detection unit did not detect an AIS signal while the clock interruption detection unit detected clock interruption; and an output signal selection unit which outputs the AIS signal generated by the AIS signal generation unit to the clock output unit when the clock interruption detection unit detected clock interruption. <P>COPYRIGHT: (C)2013,JPO&INPIT |
