RE: Fw: [RPRWG] CRC check in each node?
Hi Everybody,
I have been following this interesting thread. I want
to rock the boat a bit here to make sure all points have
been considered:
Question: Is a CRC on data really what we want?
Consider:
ATM only has a HEC and does not protect data,
it is left to the application.
In some sense RPR is just an encapsulation of user data
and has to be agnostic to the data content. As it was pointed
out here, Users may want to keep on getting the data even if
there are link errors. Maybe the application has a sophisticated error
recovery method. Maybe it has none. Is it the RPR layer's job to
provide the application an error indication?
We clearly need some kind of BER measure (in the SONET jargon)
to verify if the link is alive. Isnt the HEC good enough for that?
HEC errors are to be discarded at the next node anyway, so that
there is no issue of double counting an error.
reuven
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Reuven Zeitak PhD
Modeling And Algorithms
Native Networks
2 Granit St., P.O.Box 7165
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The Native Way = Ethernet Simplicity + SONET Reliability