Different between Passive and Active SFP+ cable

Hey,
We'd like to know what is the different between Cisco SFP+ copper passive twinax cable and active cable?
We test some Siemon passive SFP+ 7m and 10m copper cables and these cables passed our lab test ( link between nexus 5548 and FEX link).
Is that means we can using Siemon to take over Cisco because of same function and lower cost?
Thanks.

Greetings,
The following page explains in detail the difference between passive and active copper assemblies - http://www.scientificcomputing.com/High-speed-Copper-Interconnects-Address-Critical-HPCHurdles.aspx.
You can use any Cisco Twinax cables between a Nexus 5548 switch and Fabric Extender (note that Nexus 7000 switches do not support all Twinax cables). The 7 and 10m cables use an active design while the shorter cables are passive.
Non-Cisco transceivers are not compatability validated and may not be supported by TAC if you encounter any issues (Warranty Guideline http://www.cisco.com/en/US/prod/prod_warranty09186a00800b5594.html). We recommend always using official Cisco components.
Hope this helps,
/Phil

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