FW: Re: ATM comes and goes

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松井さん

こんにちは。戸辺＠東芝です。来週月曜日に徳田先生の教授就任のお祝いの会に
混ぜていただけることになりました。松井さんもいらっしゃいますか？

以下、ATM関連で、ご参考に。 当方、社内での業務激変で、全然 SFC へ行けなく
なってしまいましたが、機会を見つけて参りたいと思いますのでよろしくお願い
いたします。

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Date: Tue, 30 Apr 96 10:21:25 -0700
From: Craig Partridge <[e-mail]>
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Subject: Re: ATM comes and goes 
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    I am quoting one of the speaker's note that "ATM comes and goes"!
    I wonder, if ATM is supposed to go why should (would) it come at all?
    Why no body (in the west coast) would think that it may happen to 
    take away FDDI, Ethernet, or.. in future. 

Without knowing who was speaking or more of what was said it is a bit hard
to comment on this question but here's at least a brief attempt to make
sense of it.

It has become very clear in the past few months (and the signs were there to
see for about a year) that ATM has lost the c. 100 Mb/s desktop market to Fast
Ethernet.  (See for example, the results of the purchasing survey in the
April '96 Data Communications, p. 18).

That means for the next few years, ATM's available markets are:

    * next generation LANs (e.g., what you install after 100 Mb/s which is
    presumably 1 Gb/s).  There should be competition within the next 18
    months or so from 1 Gb/s Ethernet.

    * LAN interconnection (what MAC technology do you use to connect those
    100 Mb/s LANs with, both within campus and wide area?).  Here there's
    competition from Frame Relay (I hear OC-3c speed Frame Relay is in
    the works), and from routers using PPP over SONET.

Another possible market is the LAN supporting video and data -- that's
murky since there's a version of Fast Ethernet that can also provide this
function.

>From the IETF's perspective, not much of this matters.  The rise of Fast
Ethernet simply confirms the Internet model continues to hold (so focus on
making IPv4 and IPv6 do what we want).  And the continued presence of ATM
in the backbone means we still need good ways to encapsulate IP over ATM.

Certain problems get easier if we assume ATM isn't a LAN protocol (e.g.,
multicast is less pressing as is, I suspect, NHRP).  But while ATM's importance
as a LAN is reduced, it is still there, so I wouldn't encourage us to take
this step.

Craig


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