You have to power down a port before unplugging the cable?!?

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sirhc
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Re: You have to power down a port before unplugging the cabl

Sat Nov 07, 2015 10:53 am

IntL-Daniel wrote:Thanks for reply. Could you be more specific about "It is "suggested" to not plug and unplug active POE ports especially VH ports."? Is there any other reason except a "avoiding not plug shorted cable"?


It is suggested not to because one should get in the habit of not doing so as it is a risky approach.

It is always a good thing to un-power any electrical circuit when working on it, that is just basic safety.

I am not sure what you want from me, we suggest you not do this for many reasons:
1) You get in the habit of doing it this way and if you plug in a device with a bad cable you get a short. I tell my WISP guys to NEVER do this so procedure is to not do it this way.

2) You can plug in a connector at an angle and cause a short from pins on the connector being mis-aligned and it arcs a short.

3) If the user is plugging in live cables and gets contact and loses contact and gets contact several times in a short period (ms) then the in-rush of current is experienced in succession.

4) Applying power and removing power and applying power in rapid succession to electronics sometimes will factory default them, I have seen this happen.

It is just not a good thing to do.
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IntL-Daniel
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Re: You have to power down a port before unplugging the cabl

Sat Nov 07, 2015 11:01 am

OK thanks, I understand enough. The "MAIN" reason is still to avoid short from any reason. I was thinking about some other reasons like static electricity or some electric overload of the switch etc.

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