Re: Mid-span ethernet monitor

On 07/06/2025 04:38, Don Y wrote:

I need a device that can sit midspan (at a "splice point") and monitor
an ethernet connection for integrity.  At the very least, that continuity
exists to both ends of the span.
 While these are PoE/PoE+ drops, I don't want to place any significant
burden on the PSEs; an external power supply is therefor likely.
 I can tolerate brief interruptions in traffic (e.g., during "testing")
and even continuity (less desirable but tolerable as the testing is
only sporadic)
 Active, in-line solutions are complicated by power delivery over the pairs.
So, I'm wondering if I could passively monitor signals coming in/out and
communicate that status through a different channel?
 Cost isn't too critical.  Though physical size might be.  (the wet-dream ideal
would be something that could fit in a 8P8C coupler)

Do you need to read the data in the signals or just know that there is activity each way?  The latter would be a lot easier.
John