[ale] Need an Ethernet cutoff relay

[Phil Turmel]

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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