The ML4062-SLB-V# is packaged in a standard MSA housing compatible with all QSFP Double Density ports. With a programmable power dissipation up to 14 W and Industrial temperature range -40 to 85 °C available. Part number ML4062-SLB-V#-IND, Option IND. Transmit data from the host is electrically routed, (internal to the loopback module), to the receive data outputs and back to the host. It provides an economical way to exercise QSFP Double Density ports during R&D validation, production testing, and field testing.