| 摘要 |
PROBLEM TO BE SOLVED: To suppress expansion of circuit scale and to prevent a gate duty cycle of a circuit and readability of a source code from being deteriorated.SOLUTION: A network testing device includes: synchronizing circuits 20a as many as a predetermined number of ports for detecting positions of leading data in an ODUk frame that is mapped as a tributary port to an OTUk frame compliant to ITU-TRec.G.709 and sent from an object to be tested as a transmission bit rate; drop circuits 20b as many as the predetermined number of ports for dropping error/alarm detection data from the ODUk frame on the basis of positional information of the leading data; a counter circuit 20e for managing port numbers; a multiplexer circuit 20c for multiplexing the error/alarm detection data in an order of the port numbers on the basis of counter output; and a detection circuit 20d which processes multiplexed output in a time division manner and detects error/alarm detection signals for all the ports. |
