SFP+ Transceivers significantly reduce power consumption

EX Series switches support SFP+ passive direct attach cables. The passive Twinax cable is a straight cable with no active electronic components. EX Series switches support 1 m, 3 m, 5 m, and 7 m long SFP+ passive direct attach cables.Small form-factor pluggable plus transceiver (SFP+) direct attach copper cables, also known as Twinax cables, are suitable for in-rack connections between servers and switches. They are suitable for short distances of up to 23 ft (7 m), making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks.If using SFP+ Transceivers assemblies between equipment that should be open, and the link is not working, a quick check can be performed by plugging in a different SFP+ cable assembly between the same two ports. If the link does come up, it is likely a problem with the first SFP+ cable assembly. If the link does not come up, it is likely a problem with the configuration of the ports or incompatibility between server and switch.There are some instances when passive SFP+ cables assemblies will not work, where the ports require an DWDM Transceiver assembly. Known CNA cards that require active SFP+ Transceivers assemblies include: Brocade (1010/1020 CNA) and QLogic (QLE-8xxx-SR CNA). The EMC VNX Series Unified Storage Systems also QSFP-4SFP1​0G-CU1M – Compatible Cisco QSFP+/4SFP​+ Copper Cable Breakout, 1 Meter
requires active SFP+ cable assemblies.