GIGALIGHT’s 200G optical transceiver checker includes the 200G QSFP56 Checker and 200G QSFP‑DD Checker, which can be used to test optical transceivers, AOC and DAC. The checker also can read the internal memory EEPROM of the modules and display details of the EEPROM (such as the Part Number, Vendor Name, description and range.), monitor all DDMinformation. In addition it can measure the power of the module.The QSFP56 Checker combines the Serial Pattern Generator, Bit Error Rate Analyzer. It providescommon transmission rate for 4x25Gbps NRZ and 4×26.5625GBd PAM4.The friendly graphic user interface (GUI) provides clear monitoring for bit error rate, bit errorcounter, time, status, power of the module, selection of data rate and PRBS pattern.