[ale] Need an Ethernet cutoff relay

[Jim Kinney]

Set a watcher to detect loss of connect on the far end and use that to trigger an 8 pole relay to open.

On July 31, 2021 4:45:02 AM EDT, Alex Carver via Ale <ale at ale.org> wrote:
>I don't need a switch sensitive to shock, there is an accelerometer
>already built into the camera.  I need a GHz/GbE capable relay that can
>cut off all four pairs which means it has to be purpose built rather
>than GPIO like those RPi hats.
>
>This is also not meant to be controlled by me over the network, instead
>the relay is controlled out-of-band with hardwire that comes from the
>camera back to the relay.  Once the accelerometer trips, the relay will
>drop out and I'll have a latch that prevents it from being powered up
>again until I go into the closet and press a bypass switch.
>
>On 2021-07-29 09:48, Robert Reese via Ale wrote:
>> Hi Phil,
>> 
>> Look at the offerings by Sequent Microsystems. They can be operated
>by a Pi. So you can roll your own bluetooth/wifi/etc. solution.  Yes,
>they have DIN rail mounts available. 
>https://sequentmicrosystems.com/collections/all-io-cards
>> 
>> Also, there are many switches, such as were used in pinball machines,
>that can activate with the type of shock you're describing. All cheap,
>reliable, and easy to implement.
>> 
>> Cheers,
>> R~
>> 
>> 
>> Thursday, July 29, 2021, 12:18:24 PM, you 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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>> 
>> 
>> 
>> 
>> 
>> Cheers,
>> Robert~
>> 
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>> 
>
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-- 
Computers amplify human error
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