[time-nuts] Re: Network interface cards that support timestamping

[Lux, Jim]

On 1/30/23 5:31 PM, S McGrath via time-nuts wrote:
> All your points are good ones,   My point was this is the common lowest
> cost approach,  better approaches exist and they range from tens of dollars
> to thousands depending on the accuracy needed.
>
> Driving the CD line with a ‘real’ serial port is good enough for ‘standard’
> NTP timing applications,  its not good enough for a ‘time nuts’
> implementation


I daresay that finding a motherboard with a "real" serial port is pretty 
challenging. And even if you plugged in a serial expansion card of some 
sort, modern mobos probably aren't going to have a clean deterministic 
IRQ behavior.

The idea of a (potentially inexpensive) standalone box that can do it is 
intriguing.  But we started with networking - So what is being discussed 
is something like a USB Ethernet dongle with time stamping.