100G QSFP28

QSFP28 passive electrical loopback is used for testing QSFP28 transceiver ports in board level test. By substituting for a full-featured QSFP28 transceiver, the electrical loopback provides a cost effective low loss method for QSFP28 port testing. Attenuation options are available in nominal and attenuated versions including 0db, 3.5db and 5db; power options are 1W, 2.5W, 3.5W; plug in and out can reach to 500times.

QSFP28 loopback is packaged in a standard MSA housing compatible with all QSFP28 ports. Transmit data from the host is electrically routed (internal to the loopback module) to the receive data outputs and back to the host. Since the loopback module does not contain laser diodes, photodiodes, laser driver or transimpedance amplifier chips, etc., it provides an economical way to exercise QSFP28 ports during R&D validation, production testing and field testing.