The Small Form Factor committee approved and published SFF-8431 in July of 2009, with Panduit as a member and a signee. The document covers host ports, optical transceivers, and copper cables. Appendix E specifies direct attach copper cable assemblies. These passive cable assemblies offer a low power, low latency, low cost option for a 10Gig interconnect. They may be plugged into SFF-8431 SFP+ Passive DAC compliant ports and are interchangeable with fiber optic transceivers.
(Note: some system vendors have designed copper-only or fiber-only SFP+ ports, so be sure to confirm host port capabilities with the active equipment vendor) The Panduit 10Gig SFP+ Passive DAC Cable Assemblies are constructed with high frequency 10 GHz 100 ohm parallel shielded pairs, with two wire pairs in the cable. Panduit uses 30AWG for cables less than 4 meters in length and uses 24AWG for 4 meter and longer cables. The connector consists of a paddle card with patent pending circuitry to ensure QSFP-H40G-CU3M – Compatible Cisco 40GbE QSFP+ QDR Direct-Attach Copper Cable 3ml superior high frequency signal integrity, is housed in a die cast backshell, and incorporates a latching mechanism that allows insertion and de-insertion into the mechanical cage of a host port on the active equipment.
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