I would like to know that is the four-port PSE needs to pass the unsymmetrically operated lines Level?
Because I don't know MDI signals with 54V and GND belong to unsymmetrically, symmetrically operate lines.
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I would like to know that is the four-port PSE needs to pass the unsymmetrically operated lines Level?
Because I don't know MDI signals with 54V and GND belong to unsymmetrically, symmetrically operate lines.
Hi,
Thank you for your question.
Our PSE expert is out of the office this week but will be back in the office the week of 8/30 and he can help to advise. He will provide a response to this thread as soon as he can next week. Thank you kindly for understanding.
Best Regards,
Brett Colteaux
Hi Bill,
Because the Ethernet cable, in addition to the PD and PSE system level design, is so symmetrical (bridges, bob smith terminations) on each pair set, I expect the PoE applications to be symmetrical by design. Thanks!
Hi Darwin,
Thanks for your reply.
The document below has some content about Line to Line Surge tests(4-kV Deferential Mode Lightning Surge Tests), so I just wonder that shall we test the differential surge on the Ethernet ports?
I think the differential surge test belongs to the unsymmetrical test.
Hi Bill, yes that's correct, our apps engineer at that time tested both differential and common mode surge. This was 4kv across the pair set of each port. Thanks!
Hi Darwin,
Okay!
Actually, we can only pass the common mode surge because the Ethernet port with PSE/PD function is viewed as symmetrical design, right?
I think the IEC61000-4-5 standard doesn't define it clearly.
Thanks!
Hi Bill, agreed it's not entirely clear but either way, our 6kV reference design luckily is able to pass both. Thanks!