I have a Cisco WS-G4912 (12-port Gigabit aggregation switch) that I’m using to bring my network up to Gig-E. It’s about all that I could afford, and works fine. Most of my older servers are running 1000BASE-SX multimode fiber, but I decided to use copper GBICs for the new boxes that have onboard Gig-E ports. Unfortunately, $100+ for Cisco GBICs was way too much for me, so I found some third-party GBICs on Ebay from TNet USA right in Fairfield, NJ.

I wanted to make sure the GBICs work right, so I happened to find out about the undocumented CatOS command `show sprom [mod/port]` which shows the serial PROM information.


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