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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: Curious attitude ...
- Message-ID: <22064@venera.isi.edu>
- Date: 28 Jul 92 21:53:12 GMT
- References: <12387@pinard> <22041@venera.isi.edu> <12409@pinard>
- Sender: news@isi.edu
- Reply-To: finn@dalek.isi.edu (Greg Finn)
- Organization: USC-Information Sciences Institute
- Lines: 35
-
- In article <12409@pinard> grayt@Software.Mitel.COM (Tom Gray) writes:
-
- >However if you are attempting to provide service comparable to the
- >existing voice network and extend these services to include
- >associated video and data service, you will have to come up with a
- >system comparable to ATM.
-
- I never said that I was. Nor have others that have commented
- here recently. The issue is whether or not ATM is a good LAN
- technology, not whether it is a good technology for carrying
- isochronous data.
-
- The carrying of voice/video traffic over TCP/IP shows that it
- can carry isochronous traffic, just as ATM can carry asynchronous
- traffic. If someone makes a statement that isochronous traffic such
- as voice/video can't be carried conveniently over long-haul TCP/IP
- system, I will point out the error.
-
- There is a larger looming issue. Nearly artifact-free
- compression algorithms now exist that are used to decrease the
- bandwidth loading of both voice and video. They are often
- variable-bit-rate. This class produces VERY bursty transmission
- behavior. Those of you who are so sure that video data will dominate
- MAN and WAN traffic in the future may find yourselves in an
- interesting situation.
-
- >As others have pointed out, ATM/B-ISDN has been designed to work in
- >a multi-service environment.
-
- I don't disagree. The ISO suite was designed to replace
- TCP/IP by the late 80's. That ATM will work better than other
- link-layer protocols in LANs is an issue much up in the air.
- --
- Gregory Finn (310) 822-1511
- Information Sciences Institute, Marina Del Rey, CA 90292
-