Someone will no doubt correct me or disagree, but I believe that option 27 is a no-op (fidget spinner). It's undocumented. It might have dated back to the OBi 100/110 days. Back in the olden days, when I used 10/100 Mbps switches, I could check the LED color on the Ethernet jack to determine if it was 10 or 100. All my network equipment is gigabit now, and the LEDs just indicate gig vs. 100/10 speed (same color for 100/10). If you have a device that displays the Ethernet speed for each port, you could verify whether or not the option 27 is doing anything.