It seems quite confusing.
http://en.wikipedia.org/wiki/Latency_(engineering)

I have read quite some articles about these three words
now in the context of industrial control network. Ethernet
is clearly gaining popularity. Various CAN based network
protocols (CANopen/DeviceNet/etc) are still quite popular
as well. But both seems to suffer from the latency issue.

Reference:
http://www.embeddedrelated.com/usenet/embedded/show/16093-1.php

Quote:
"CAN has no particular advantage in latency --- it has one in
*determinism*, i.e. its latencies won't vary as wildly as those of an
Ethernet at the same throughput load relative to their respective
capacities."

So it seems to me that determinism is measured with the
jitter (variation of the latency). Is this correct?

We all know that determinism has nothing to do with
base rate (CAN is up to 1Mbps, and there are
10Mbps/100Mbps/1Gbps Ethernet). Bandwidth
does.

In the automotive industry, time triggered protocol
and FlexRay supposedly solve the problem with
latency issue of CAN. But FlexRay so far is too
expensive to be used in the factory automation market.

Regards,
Xiaofan
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