Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Who is using ABR?
In article <7k71qm$q51$1@mango.singnet.com.sg>, "Chan Kok Kee" <ckokkee@singnet.com.sg> wrote: > As far as I know there is no public service provider in the world that is > selling ABR service. It is difficult to implement, provision, manage and > most important bill. What REAL purpose does it serve when there is VBR-NRT > and UBR? ABR is different from VBR or UBR, however, in important ways. ABR allows you to make good use of statistical multiplexing, where VBR really does not, but at the same time, ABR adjusts to available bandwidth by sending feedback to the source, and also provides for a minimum guaranteed bandwidth, neither of which you get with UBR. Like other features designed into ATM, it is possible that ABR will be forgotten from sheer lack of interest. But it does give some useful possibilities. For example, if ABR is used on links which support VBR, it could allow applications set up for ABR to fill up that ATM link nicely, while avoiding the kind of haphazard service UBR would give you. I suspect that as ATM links become heavily loaded, UBR becomes less and less desirable. But ABR would still work well. -- Bert manfredi@arl.bna.boeing.com Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't.
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