[myrandomcomment]

7148SX was not truely non-blocking. It was a Clos in a box. 4 chips in front (12 ports each, and 2 in the back, each front panel chip wired 6 ports to each of the rear chips as a LAG). If the hashes worked right it was non-blocking, but taking an Ixia out of the box and clicking go on a RFC ful mesh test would give you drops. The 7148S was created after the 7148SX shipped as a cost reduced version for those that had a workload that fit the tput characteristic. The 10GBaseT version was the same 3 chip switch. The power draw on the 10G-T phy was quite high at the time.