One is QSFP+ passive direct attached cable

QSFP Passive Cable use cutting edge technology to provide a cost effective high speed interconnect solution. At 3 times the port density of a standard SFP plug, The Quad Small Form-Factor Pluggable plus (SFP+) interface provides the low profile, high bandwidth, reduced power cost needed for HPC clusters and large data centers. Applications include QDR InfiniBand, DDR InfiniBand, Fibre Channel, 40-Gigabit Ethernet, and SONET.

Sopto provides two kinds of QSFP Passive Cable direct attached cables. One is QSFP+ passive direct attached cable, the other one is QSFP to 4 x SFP+ Splitter Cable.What is the advantage of QSFP to QSFP passive Twinax cables?The advantages of the QSFP to QSFP Passive Twinax Cable areTimbercon, Inc. has announced availability of the QSFP Passive Cable electrical loopback. The electrical loopback is used for testing QSFP/QSFP+ transceiver ports in board-level test. Substituting the electrical loopback for a full featured transceiver provides a more cost-effective, low-cost alternative, Timbercon asserts.