[ale] Need an Ethernet cutoff relay

[Alex Carver]

Gah, no X-10.  No remote control either.  This is going to be a
hardwired kill-switch application that has to be manually reset.  If the
camera gets knocked off the wall, the switch will open and won't close
even if they plug the camera back in.

On 2021-07-29 09:18, Bob Toxen via Ale wrote:
> Great idea.  X-10 remote control could be used to kill power.
> X-10 can, of course, be controlled by computer, phone, or otherwise.
> 
> On Thu, Jul 29, 2021 at 10:26:56AM -0400, Phil Turmel via Ale wrote:
>> If you can't find anything else, consider a small brainless
>> unmanaged POE switch and kill its power.
>>
>> On 7/26/21 2:18 PM, Alex Carver via Ale wrote:
>>> I've been searching for over a week now with no luck.
>>>
>>> What I'm looking for is a small-ish (DIN rail mount would be ideal)
>>> relay device that accepts a signal and will completely cut off all four
>>> pairs of an Ethernet connection.   It should at least be shielded (so no
>>> cheap switch boxes from Amazon adorned with Brother P-Touch labels,
>>> those are also manual push buttons :) ).
>>>
>>> Some of the closest I've gotten are A/B switches but they're in desktop
>>> cases and are just too big.
>>>
>>> Purpose:
>>> I am going to be installing a VoIP door station to replace the doorbell
>>> button. It's a PoE unit so I do need all the pairs. It has several
>>> additional I/O and power ports for various uses, one of which provides a
>>> steady 12 VDC when the unit is up. I plan to link this to a latching
>>> relay in such a way that if the 12 VDC suddenly disappears (e.g. someone
>>> took a baseball bat and adjusted the camera angle), it will break the
>>> Ethernet lines to the exposed patch cable making it a dead cable which a
>>> computer can't use.
>>>
>>> The box itself doesn't need the latching relay, it just needs a simple
>>> relay that is either on or off with the application of signal.  I'll
>>> take care of the latching part separately with other external relays.
>>>
>>> I just can't seem to find anything like this.  Just for fun I tried an
>>> industrial PoE injector that I had handy which takes 24 VDC in but the
>>> data lines are passed right through the unit so even with it off it
>>> doesn't stop the drop from working as a minimum 10/100 (two pair) port.
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>>
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