Cell Relay Archive

[Koen Peeters <koen.peeters@ciminko.be>]

Robin DeFreitas wrote:
> 
> Can someone enlighten me on OAM cells . I always assumed that OAM cells were
> only sent when there was an indication of a problem with a PVC. However some
> one has told me that OAM cells can be sent periocically without there being
> any problems associated with a PVC. Can some one give some explanation on
> how OAM cells really work or maybe some type of document that explains it
> all !?
> Thanks in advance.

OAM cells are also used to measure cell loss ratio's per VP or per VC.
An OAM cell contains in this case how many cell's have been sent. The
receiver can compare this with how many cell he actually received. The
difference is lost somewhere in the network.

Cell loss is an important quality parameter in ATM. (at least for CBR,
VBR and ABR services).
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