QSFP-DD to QSFP-DD DAC/AOC cables contain 2 QSFP-DDs directly connected via copper/fiber. This type of cable is dedicated to 200G and/or 400G applications and is suitable for QSFP-DD ports on any brand of equipment. LIGHTX offers a full range of QSFP-DD cables and a unique set of services such as testing, coding, customization, effective support and technical expertise.