Thanks for the answer. No, i really did mean nics. I have a data acquisition pc with 6 ethernet interfaces. I'm looking for a software solution.
Le jeu. 27 sept. 2018 2:59 PM, shouldbe q931 <shouldbeq...@gmail.com> a écrit : > On Thu, Sep 27, 2018 at 5:57 PM Maxime Lemonnier > <maxime.lemonn...@gmail.com> wrote: > > > > Hi, > > > > I'm trying to do something similar but slightly different than Vadim on > this thread https://sourceforge.net/p/linuxptp/mailman/message/35980617/ > > > > I too have PTP ethernet cameras that need the full bandwidth of the nic. > The difference is that I also have a PTP timeserver (timemachine's > TM2000A). The host PC uses linuxptp with hardware timestamping. > > > > When I put the cameras on the same gig-e switch, it all plays nice and I > get satisfying offsets (sub us). > > > > To put the cameras on their own nic, I must also put them on their own > subnets, so I would need to route ptp traffic back'n'forth. Is that > possible? > > > > Should I rather synch the cameras with my (synched) PC clock with, e.g. > > ptp4l -i if_cam0 -i if_cam1 -m -S > > > > (I noticed you can't use hardware timestamping with multiple interface > for reasons that are probably obvious to you guys) > > > > If so, I may have not tried hard enough, but I could not get satisfying > results with that methods (I have a litle setup that trigs cameras, and the > returned timestamps were 10-100 ms appart) > > > > I presume when you say "cameras on their own nic" I presume you mean > "cameras on their own switch" ? > > To go between subnet, there are two options, routing, or a boundary > clock. Determining which is most appropriate depends on the budget and > level of synchronisation required > > Unless you have a different requirement to have the cameras on a > different subnet to your grandmaster, why not simply link the switches > at L2 ? > > Cheers >
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