Cell Relay Archive

["Tim Dwight" <tdwight@fore.com>]

The document you are reading may be referring to OAM cells, which
are commonly used for testing purposes and which contain a CRC
that covers the payload.

tim


Jerric Davis <pheadrus1@hotmail.com> wrote in message
wFgf4.2$eL1.43681@WCG-Reader3">news:wFgf4.2$eL1.43681@WCG-Reader3...
> Yige,
>   I think that I do know to what you are referring.  I have had a switch
> trash some IP packets due to SAR chip problems(this generally makes the IP
> guys mad!) In Segmentation and Reasembly (AAL5), the PDU has a 32byte CRC
> added to the end of the PDU before it is segmented into cells, on
reassembly
> this CRC is checked.  I don't have the docs in front of me but you might
> look at the SAR process for your answer.
>
>
> Yige Zhu <zyg@dcb.hz.zj.cn> wrote in message
> news:3861aff4.86747320@news.bentium.com...
> > I am reading a document about ATM test.In this document, it mentioned
> > payload CRC while testing errored cells.I do not know what is payload
> > CRC.Cause there is only HEC in the header of a cell,and the remain 48
> > octets are data,there is no CRC in the cell at normal condition.
> > So is the payload CRC means send special cells which the payload,48
> > octets,have some octets reserved  for CRC?and this CRC check the 48
> > octets or 53 octets?
> >
> > Thanks in advance.
>
>