The MILJET MJ-QSFP-4SFP10G-CU3M, QSFP+ to 4xSFP+ DAC copper cable is a 40BASE QSFP+ hybrid passive cable. One side is (A) QSFP+ to (B) Side is 4*SFP+ Connectors. It is a request to link with QSFP+ port 40Gbps switch or host rate and feed up to 4x10Gbps switch or host.
Connector A: (1) QSFP 40Gbps Rated Connector (SFF-8436 Compliant)
Connector B: (4) SFP+ 10Gbps Nominal Connectors (SFF-8431 Compliant)