On Thu, Oct 4, 2018 at 11:39 AM Paul Koning via cctalk < [email protected]> wrote:
> > > > On Oct 4, 2018, at 1:30 PM, Grant Taylor via cctalk < > [email protected]> wrote: > > > > On 10/04/2018 11:26 AM, Paul Koning via cctalk wrote: > >> That's sort of accurate. A quick look shows some key differences: V2 > adds the "collision presence test" -- verifying the collision detect signal > is working. There is also the "jabber timer" -- a watchdog timeout that > stops excessively long frames. And V2 introduces the loopback protocol > (protocol type 90-00). > > > > That mostly sounds like the frame formats are the same on the wire and > that the differences are in the protocols that use said frame. > > > >> The collision presence test is somewhat of an interoperability issue: > if you attach a V1 transceiver to a V2 NIC, the NIC would complain on every > transmit that it didn't get the collision test signal. > > > > That makes me wonder about the "heartbeat" switch that I see on older > AUI transceivers. > > Yes, I think that's the collision test. So in the OFF position you have a > V1 compatible transceiver, ON is needed for V2. > Is that the same as SQE? I always had to turn that bad-boy off or risk collision storms :( Warenr
