| 摘要 |
PURPOSE: A device for detecting major alarms in an E4-level optical equipment is provided to convert a serial signal of an optical signal into a parallel signal for processing, and to apply a count control signal to regulate a count value of a counter. CONSTITUTION: A serial-to-parallel converter(100) receives an E4-level serial data signal and a clock signal, and convert the received signals into a 8-bit parallel data signal and a corresponding clock signal. A MUX(200) selects the parallel data received from the serial-to-parallel converter(100) and parallel data received from external, and outputs one of the parallel data. A major alarm detector(300) counts the parallel data received from the MUX(200) by the clock signal received from the serial-to-parallel converter(100), and outputs a major alarm signal if a predetermined time set by a count control signal is counted. |
