Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: VPI/VCI and Type of traffic?
In article <3m90jv$ic5@newstand.syr.edu>, mahesh@furud.npac.syr.edu (Mahesh Subramanyan) wrote: > Hi: > > I read a lot in the literature that besides cell multiplexing, VCs and VPs > form a useful way of distinguishing types of traffic. Can anybody tell me > how this is done? > > How by looking at the VPI/VCI value, the switch identifies whether the > traffic is VBR, CBR, ABR and what kind of traffic is it (voice, video > or data)? > > You can't distinguish connection type by the VPI/VCI per se. However, during conection establishment when the desired characteristics of a connection are known, this information can be retained in the connection table in each ATM switch and used by the switch during cell switching. It would be at this time that virtual circuit priority, for example, would be established so that a switch could advance high priority traffic, such as CBR, on an outbound queue over delay-tolerant traffic such as ABR. -- Alan Schaevitz AYS Associates ays@hooked.net |
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