J9008a SFP+ direct attach cable compatibility (578 Views)
Occasional Contributor
Posts: 3
Registered: ‎03-22-2013
Message 1 of 3 (578 Views)

J9008a SFP+ direct attach cable compatibility

[ Edited ]

Hi All,


I've got a 2910al switch which I'd like to upgrade with a J9008a module to allow connectivity with a Dell PowerEdge server running an Intel X520-DA2 NIC.  I'll be using a SFP+ direct attach cable.


This post on the Intel forum suggests that HP DAC cables do not conform to SFF-8472 standards and won't work with the Intel NIC.  The post also implies that the J9008a will only accept HP DAC cables - does anyone know if this is true?


I've ordered a Dell 10GBASE SFP+ 3M TWINAX (part 2CM32) cable but am now concerned it might not work.  I have yet to buy the J9008a module.  Of course, I've also invested in these Intel NICs.


The ProCurve 2910al Installation and Getting Started Guide (appendix C-1) states that direct attach cables should be "One-piece devices consisting of a cable with SFP+ connectors permanently attached to each end, complying with SFF 8431 SFP+ specifications." and makes no mention that the cables should be HP branded.


Does anyone have any experience on this that could help me out; better still has anyone managed to use Dell TWINAX DAC's with this switch?


Many thanks in advance.


UPDATE: I've done some further reading and come across other posts where people state ProCurves require DACs and transceivers that embed an HP vendor ID forcing the use of HP accessories only.  I still can't find anything official from HP to confirm this though.


As the HP DACs apparantly don't work with the Intel NIC I guess I'll now have to resort to sourcing HP transceivers for the HP end and Intel transceivers for the Intel end and dump DAC all together.  What a pain!




Please use plain text.
Frequent Advisor
Posts: 54
Registered: ‎03-04-2013
Message 2 of 3 (550 Views)

Re: J9008a SFP+ direct attach cable compatibility

Procurve switches are programmed to only accept Procurve transceiver codes.


I have a Sun server that's happy on an HP DAC.

Please use plain text.
Regular Advisor
John Gelten
Posts: 70
Registered: ‎09-08-2010
Message 3 of 3 (533 Views)

Re: J9008a SFP+ direct attach cable compatibility

I can confirm that it 'generally' works when you make sure the DAC is compatible with your switch (this is valid not only for HP switches); most servers I know of (though I am not a server-guru) happily accept any DAC.

And indeed, there are combinations where a DAC just is not compatible, and you have to use the normal transceivers and cabling. Unfortunately, DAC is not the standard, it is a cheap alternative in many-but-not-all setups.


Please use plain text.
The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation