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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!isi.edu!finn
- From: finn@isi.edu (Greg Finn)
- Newsgroups: comp.dcom.cell-relay
- Subject: Re: Is ATM well suited to LANs?
- Message-ID: <22934@venera.isi.edu>
- Date: 21 Nov 92 23:04:09 GMT
- References: <1992Nov19.104113.1@tnclus.tele.nokia.fi>
- Sender: news@isi.edu
- Reply-To: finn@dalek.isi.edu (Greg Finn)
- Organization: USC-Information Sciences Institute
- Lines: 22
-
- In article <13605@grayt> grayt@Software.Mitel.COM (Tom Gray) writes:
-
- >Indeed if the application on the WAN is to allow the user to edit
- >the video stream, why restrict it to MPEG when JPEG is much more
- >suitable. Perhaps this will show you why ATM is designed for end to end
- >applications and negotiations of protocols.
-
- ATM is not designed for negotiations of protocols. ATM is a
- data-link layer protocol. Negotiation of options and encoding
- protocols is a much higher layer function that occurs usually in the
- session and presentation layers.
-
- The choice of a coding standard is application driven. MPEG
- is designed for motion picture coding, hence its name. JPEG was
- designed for stills. You feel the need for JPEG frame by frame to
- decrease artifacts - fine. You pay for greater bandwidth consumption.
- This has nothing to do with ATM unless you are arguing that ATM can
- send JPEG packets more easily than MPEG packets. That is a pretty
- strange argument to make if it is supposed to favor ATM.
- --
- Gregory Finn (310) 822-1511
- Information Sciences Institute, Marina Del Rey, CA 90292
-