The Electrical Loopbacks from O-link intend to support Datacom, Infiniband, Fiber Channel applications, which provide a method for port operations testing in board and system. They are hot swappable, constructed of metal cast for excellent EMI performance.

O-link's QSFP28 Electrical Loopbacks are compliant with the QSFP+ Multi-Source Agreement (MSA) Specification SFF8436 and SFF8661. They comply with parallel applications for 4 x (100M~27.95G) Specification. Digital diagnostics functions are available via a 2-wire serial interface, as specified in the QSFP+ MSA.