[LinuxPPS] Best practice and hardware recommendation for PPS input

[Jonatan Walck]

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Hello everyone,

I'm researching the best way to get a 1PPS signal from a freqency
reference (Caesium-based) into a Linux-based NTP-server.

Much of the node design is already set (GNSS, frequency reference,
backup systems...) but we're currently evaluating the network card
options (10Gb) for the NTP-server in conjunction with the PPSin,
either featured on the NIC itself or through another add-in card.

What options and best practices are there when highest precision is a
main goal, and which current hardware options work (best) with
LinuxPPS?

PPS output for tracability is of interest too.

One card I have an eye on is the Symmetricon bc635PCIe.

Thanks,
Jonatan Walck
Netnod Internet Exchange
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