I am not aware of a cable matrix for mixing different brands together. Here is a link to the cable that is recommended from Dell. [URL] If the cable you have is a passive cable, there is a good chance it will work. When you get the switch I suggest checking and updating the OS, then test the cable. 
Hello, I would like to buy a pair of S4048-ON TOR switches but my concern is that my server side connects to Brocade (now Extreme) VDX's using DAC SFP-10G-PCU3M. What is the chance that these cables and transceivers essentially are going to be recognized and working in switch running OS 9.x. Please let me know if there is existing optics and transceiver compatibility matrix. So far I've found only that: The system supports Dell-qualified transceivers and only some of the non Dell-qualified transceivers. <ADMIN NOTE: Broken link has been removed from this post by Dell> Many thanks in advance, Joro.
Brocade/Extreme SFP-10G-PCU3M compatibility with S4048-ON