This is highly cost-effective way to connect two sfp/sfp+/sfp28 devices (for example two units of our new ccr2004-1g-12s+2xs) for very short distances, within racks and across adjacent racks.
they provide a low cost, low power and low latency interconnect solution for 25-gigabit ethernet, fiber channel and other industry standards, and are direct attached compliant and fully conform to the sfp+ msa specifications.
two versions are available- xs+da0001 (1m) and xs+da0003 (3m)