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dontdoxxme 6 days ago

2.5GBASE-T? But I do 10GBASE-T over one. Provided it has Cat 6A cable inside it and has been tested to IEC 60512-9-3 & IEC 60512-99-002. (See https://ieee802.org/3/bt/public/oct15/Draft%20of%20IEC%20605... for some fun photos of what happens when PoE is disconnected on a connector before IEC 60512-99-002...).

timerol 6 days ago | parent | next [-]

The combination of "When documenting" and referencing "J3" indicates that dlcarrier is referencing a limitation of a specific port on a product that they worked on, not a set of global limitations on any 8P8C connectors

dlcarrier 5 days ago | parent | prev | next [-]

I had assumed that the wires in the jack would rest along the bottoms of the blades in the plug, but I guess if it was never designed for high current applications, the contact area wouldn't be a consideration.

It took a few tries to get it right, but it's amazing that PoE is even an option given how far it is outside of the scope of what the cables and connectors were designed for. I've heard of locations that use it for power, instead of 120 V outlets, because it's cheaper and safer and most portable high-current appliances use batteries, while fixed high-current appliances use 240 V outlets.

Hot plugging is always a challenge, especially with direct current, and negotiation prevents that from being a problem while making a connection, but I never considered that unplugging isn't negotiated first. I wonder if IEC has ever considered using a locking latch, like an EV charger.

I have a PoE camera that I sometimes unplug to restart it, when it freezes up and I can't restart it from the web interface. I'll be sure to turn that port off first, before unplugging it.

DHowett 5 days ago | parent [-]

If you can turn the port off and then back on remotely, perhaps you can skip the unplugging part completely? I know that some managed PoE switches even offer a button to power cycle a port.

dlcarrier 5 days ago | parent | next [-]

Good point, now that you mention it, it's not turning off PoE, just stopping data. I don't know if there's a great way to handle it, and there's no way I'm shutting off the entire switch. I'll just unplug the patch panel end of the cable, instead of the switch end, so the jack I'm wearing out is one that's easy to replace.

bbarnett 5 days ago | parent | prev [-]

It's just the chip the NSA put in the cable, failing to initialize first try.

formerly_proven 5 days ago | parent | prev [-]

You'll also enjoy annex H of https://usb.org/sites/default/files/USB%20Type-C%202.4%20Rel...