Cell Relay Archive

[Yu Ning <yuning@mindless.com>]

Hi,
>On 19 Aug 1998 11:10:45 GMT
>betker@pgtr0062.mch.sni.de (Thomas Betker) wrote:

> fdaly@iona.com wrote:
> : Can some answer the following questions for me:
> :
> : a) The bearer class.
> : As my application will always be used for native ATM communication
> : (that is, a native ATM source talking to a native ATM server) I should
> : always use X.  Is this correct ?
> 
> I assume here that a) you use SVCs (not PVCs), b) you don't send
> raw ATM cells, but AAL5 packets, c) you have VBR traffic, not CBR.
> [So the traffic is, e.g., similar to IP traffic.]
> 
> In that case, you may use both BCOB-X and BCOB-C. BCOB-X should work
> fine. With BCOB-C, the ATM network might be able optimize resources
> a bit, though (e.g., buffer sizes, by looking at the AAL parameters).
> But that depends entirely on the network; you'll have to ask your switch
> vendor about that.
> 
There seems some misunderstanding the definition of on class X service.
IMHO, class X service means that you get only the cell-relay (bearer) capability
>from yuor carrier, and you can send cell directly through your mutually agreeed
connections (mostly PVC, whether they are CBR, VBR ..). Then by refering class
X, we mean get/provide ATM service directly from ATM layer (without the upper
AAL layer) via PVC (SVC in fact needs SAAL).

>From my discription, there seems some mismatch between the answer and the original
question. My answer is yes, to end to end native ATM application.

Pls correct me, if I'm wrong, :-)

BTW, 
what's BCOB-X/-C? 

regards,

Yu Ning.
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Yu Ning
ATM R&D Center of
BUPT (Beijing U. of Posts&Telecom)
Beijing (ZIP:100876, MBox:147#), P.R.China 
yuning@mindless.com
Ideas reflect view points of my own,:-)
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