Roland Tollenaar wrote: > Hi > >> RTnet is not bending the hardware: use what you would use for normal >> Ethernet. > Yip passed this point already it wasn't a problem but thanks. > > So the pinging works but I do find it curious that the time is >5000 us > and very inconsistent (5000us to 6500 us). Should this pinging not me > much more stable (and perhaps faster?) than that?
FAQ alarm! ;) Please keep in mind that you are running RTmac/TDMA with a period T=5 ms by default. Thus you have a roundtrip delay that depends on the schedule (i.e. if the reply can be sent within the same cycle) and is typically between T..2T. The clocks of rtping and TDMA are unsynchronised, therefore you see those wandering roundtrip times. > > Btw I did not have a cross-over so used straight through over a switch. > The latter may cause above behaviour I presume? Cheap, ASIC-based switches: ~ +10 us additional latency Complex, manageable switches: ask the vendor :) Jan
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