Is there such a thing as a 10GBase-T SFP+ transciever

Jima nanog at
Sun Feb 2 04:40:29 UTC 2014

  +1.  Cisco calls them Twinax, HP calls them DACs.  I don't know what 
anyone else calls them as it hasn't come up in conversation for me.

  Cisco appears to offer them in 1, 1.5, 2, 2.5, 3, and 5 meter passive, 
as well as 7 and 10 meter active.  HP has them in 1, 3, 7, 10, and 15 
meter; no idea what the passive/active breakdown might be (they don't 
appear to offer that information as freely).  I've mostly used the 
3-meter HP DACs so far, and I've been rather happy with them, 
particularly the cost savings under 2x 10gbit SFP+ fiber transceivers.


On 2014-01-30 19:25, Chris Balmain wrote:
> You may wish to consider twinax for short distance 10G over copper with
> SFP+ at both ends
> Typically marketed as "direct-attach" (you can't remove the cables from
> the transceivers, it's all integrated)
> On 31/01/14 12:26, james jones wrote:
>> I would like to know if anyone has seen one of these? If so where?
>> Also if
>> they don't exist why? It would seem to me that it would make it a lot
>> easier to play mix and match with fiber in the DC if they did. Would
>> be so
>> hard to make the 1G SFPs faster (trying to be funny here not arrogant).
>> -James

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