QFSP to SQFP QDR Infiniband 100m Fiber $45 or less + Shipping

[Smalldog]

Looks like a great deal on 100m fiber QSFP to QSFP.

IBM Tyco 30M Optical QDR Infiniband 4x10 QSFP Cable TE Acoo 2123272 2 49Y0494 | eBay

$44.95 BIN + $9.50 shipping. $1 shipping for each additional cable.

They accepted an offer of $40.

 

[dba]

It's about 98 meters longer than I need, but for anyone who needs a long cable, this is a screaming deal.

 

[Smalldog]

I thought for sure it was listed as 100M when I originally saw it, but now I see it's 30M. I must have been really tired when I posted this.

Still probably longer than anyone needs, but indeed a great deal. I wonder how hard it is to cut these down to size?

 

[dba]

I have terminated and spliced fiber by hand. It's do-able with the right gear, but it makes about as much sense as building your own DB9 serial cables. Splicing uses even more expensive equipment than terminating, and I have a notion that Infiniband cables use multiple fibers, which would be an even greater challenge.

I thought for sure it was listed as 100M when I originally saw it, but now I see it's 30M. I must have been really tired when I posted this.

Still probably longer than anyone needs, but indeed a great deal. I wonder how hard it is to cut these down to size?

 

[33_viper_33]

Finally broke down and purchased 2 connectx 2 cards. Just trying to determine if these cables are designed for 40Gb/s infiniband or 10Gb/s ethernet as these cards can do both. Any help would be appreciated!

 

[mrkrad]

qsfp to 4 sfp converters do exist but do they work for nic's or switch only???

Would make an awesome PC-switch if you had two connectx-3 cards and break out cables!! 8 ports per nic

 

[dba]

Finally broke down and purchased 2 connectx 2 cards. Just trying to determine if these cables are designed for 40Gb/s infiniband or 10Gb/s ethernet as these cards can do both. Any help would be appreciated!

ConnectX-2 cards that have QSFP ports support both Infiniband (DDR or DDR/QDR depending on the model number) and 10Gb Ethernet. The same cards with SFP+ ports are 10GbE only.

 

[33_viper_33]

Thanks for the reply DBA. That didn't answer my question though. I'm specifically asking about the fabric. Are these cables capable of transmitting 40Gb infiniband as well as 10Gb ethernet? I ask since there is electronics involved for the optics. Are they rated for both speeds/communication standards or are they specific to one standard or the other?

 

[cactus]

QSFP will work for 10GbE and IB. SFP+ will only do 10GbE. If going from a Mellanox card to Mellanox card or switch, QSFP will act as either a 10GbE channel or as a IB channel, not both. You can get QSFP to SFP+ adapters like this if you want to go from a Mellanox ConnectX(2|3) VPI card to 10GbE SFP+. VPI cards can be software selected to what protocol they use.

@mrkrad That is an interesting idea, but I am going to guess no because the ASIC would have to address four independent channels vs just narrowing a single channel.