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Unread 07-02-2017, 10:00
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sparkE
AKA: James
FRC #2168 (The Aluminum Falcons)
Team Role: Mentor
 
Join Date: Feb 2010
Rookie Year: 2009
Location: CT
Posts: 446
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We are planning on using a passive injector similar to these: https://smile.amazon.com/gp/aw/d/B00...ds=passive+poe

We will be removing the barrel plug and soldering in a whip that can plug directly into the VRM.

Note passive poe injectors are explicitly allowed per the blue box of R51. So as long as you can explain I would find it hard to fail inspection.

The advantage of using something like the one I linked is the reduction of single point failures. There's only one cable plugging into the radio (not an Ethernet cable AND a barrel plug). This is at a cost of a single additional RJ45 connection and the loss of a barrel jack connection (which is the one that usually fails you since there is no positive retention. With the previously linked cables, you're reducing the wires that need to run across the robot, but you have increased the number of failure points as there are two additional RJ45 plugs and one additional barrel jack connection. So reliability has actually gone down.
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Last edited by otherguy : 07-02-2017 at 10:06.
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