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interval is reported to the sender. e error rate during time step i is given by M[i]/N[i] × 100 (%), where the number of packets arrived during this interval is N[i], and the number of packets containing error is M[i]. Using the CRC function for HpFP, a packet containing multiple bit errors is counted as one.3.2Interface of CRC function for HpFPe objective of this research is to monitor the network condition of the WINDS with bent-pipe mode using hperf. We analyze the network condition and the failure by monitoring network parameters. Since there is no quantita-tive method to verify the quality of the network at the application layer and transport layer, we measured the network condition using a 4K video transmission system for the WINDS with bent-pipe mode [1] [2]. We transferred a 4K video from the sender equipped with a 4K camera and conrmed the quality of the movie on a monitor of the receiver by visual inspection. Although the verication of quality aspects cannot be conducted by this method, the conrmation of visual qualitative quality is possible. erefore, this method is helpful as a reference of the qual-ity of measurements.As mentioned above, in this research, we implement FiF2Experiment model of WINDS satellite communicationSchematic diagram of WINDS data transmission test system and utilization systemSenderReceiverWINDSSatellite10GbE NIC10GbE NICTX Modem10GbE NICRX Modem10GbE NICSchematic diagram of WINDS data transmission test system and utilization systemTransmissionpathThroughput: 3.2Gbps（Efficiently: 2.76 Gbps）Latency: 250ms x21GbE NIC1GbE NICReturnpathReturn path (latency: 0 ‐4000 msec)tccommandtccommandFiF3Schematic diagram of modem for WINDS with bent-pipe mode Direct modulation/demodulation (modem) for reconfigurable communication deviceDirect modulation/demodulation (modem) for reconfigurable communication device4K-UHD DisplayHigh-End PC10GbE I/F Board4K-UHD DisplayHigh-End PC10GbE I/F BoardDEM PWBDirect OFDM MODEMMOD PWBLNCBUCTWTAWINDS18.25GHz28.05GHz1.93GHz2.45GHzIF INIF OUTHSMC IFBBFPGADEMFPGAHSMC IFBBFPGAMODFPGATXModemRXModem1693-12 A Network Quality Check Tool via HpFP Protocol on WINDS Satellite Link