Re: Network card with relay in case of power failure

[Joel Jaeggli <joelja () bogus com>]

> On Jun 17, 2020, at 13:14, Dovid Bender <dovid () telecurve com> wrote:
>
> Hi,
>
> I am sorry if this is off topic.I was once demoed a network device that had two interfaces. The traffic would go 
> through the device. If there was a power cut or some other malfunction there would be a relay that would physically 
> bridge the two network interfaces so the traffic would flow as if it was just a network cable. Is anyone aware of 
> such a network card or device?

that kind of device is an ethernet bypass tap.  the device is relay driven and closes when it loses power bypassing the 
in-band device.

there are others which require that they remain powered, but use a heatbeat of some flavor to detect failures and 
switch the path accordingly.

copper tap infrastructure has kind of fallen out of favor as ports have gotten faster (vs just spanning on a switch or 
router or passive optical taps) but it still exists.

gigamon / niagra and a number of white-box  tap manufactures make device that would be referred to as active bypass 
taps.

> TIA.