Summary:

DSFP (Dual Small Form Factor) Passive Electrical Loopback ML4019-LB-56-3.5W, is used for testing DSFP system host ports. Substituting a fully featured DSFP transceiver with the ML4019-LB-56-3.5W in loopback provides a cost effective low loss method for DSFP port testing.

The ML4019-LB-56-3.5W comes packaged in a standard MSA housing compatible with all DSFP ports. High speed signals are electrically lopped back from TX side to RX side of the module, the differential TX pair is connected to the corresponding RX pair, and the signals are AC coupled as specified by DSFP MSA HW specs. It provides an economical way to exercise DSFP ports during R&D validation, production testing, and field testing.

The ML4019-LB-56-3.5W provides programmable power dissipation up to 3.5W allowing the module to emulate all the DSFP power classes. Industrial temperature range -40 to 85 °C available upon request. Part number ML4019-LB-56-3.5W-IND.