Hi,   I'm looking to connect an MS425 and an MS390 w/ a 2x 40G module together using the 40G QSFP ports. Both switches are in the same rack and I'd rather not purchase a 40G fiber transceiver if possible. I am not looking to stack the switches, only to uplink them together.   As the 40G staking cables are QSFP twinnex cables, will these cables work as 40G uplinks between switches, or is there some reason they'd be limited to only working on ports configured as stack ports? ... View more