On Tue, Mar 08, 2022 at 12:38:46PM +0100, Andre Puschmann wrote: > Dear all, > > we are trying to build a PTP grandmaster with linuxptp to provide sync > signals to telco equipment. > > So far we've only used the internal oscillators of the NIC for a bunch of > cards, Intel based and also Microchip LAN7430. > > I am now looking into disciplining the oscillators with an external PPS > input to improve frequency stability. The EVB-LAN7430 eval kit has a PPS > input exposed over a GPIO pin. > > I was wondering if someone has used this successfully at all?
Yes, I would guess so. > In general, what are the steps to set this up? Is this something managed in > the NIC driver itself or do I have to (permanently) run the `ts2phc` to keep > to PHC in sync? You need to run ts2phc or similar. In general, the NICs are dumb devices. > Are there studies/measurements that compare the stability of such a system > to e.g. commercial PTP grandmaster solutions? I haven't seen any. I've done my own reports showing, for example, linuxptp + Intel210 + uBlox GPS radio performing comparably to commercial GM solutions. However, making a reliable GM product is quite a bit of work. The PTP software stack is only one piece of the puzzle. HTH, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
