Gerard is correct. An SM will function without it, though it makes the Ethernet less than protected from basic transient surges (even little ones).
I would suggest replacing it From: Af [mailto:af-bounces+paulm=pdmnet....@afmug.com] On Behalf Of Gerard Dupont III via Af Sent: Saturday, September 27, 2014 10:28 PM To: af@afmug.com Subject: Re: [AFMUG] missing part on Canopy SM It's a Transient Voltage Suppressor. I haven't tested others, but I know 100 will function just fine without it. In a pinch I remove them to fix ethernet errors. I think this is the right part number if you wanted to replace it. RCLAMP0504FCT Gerard On Sat, Sep 27, 2014 at 10:19 PM, Ken Hohhof via Af <af@afmug.com<mailto:af@afmug.com>> wrote: Anybody know what that little 6-leaded SMD is between the RJ45 jack and the Ethernet transformer on the PCB of a Canopy SM? We bought a used SM that doesn't work (it lights up and seems to be trying) and that part is missing. I don't think it's optional. But is its absence causing the problems? Or just an indication that a tech didn't finish repairing it and mistakenly marked it as tested and good? If it's a surge protection component, it seems too small to do much good.