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n-1-1-030.50.2
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1995-07-21
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030.50.2 Gigabit Networks
by Craig Partridge <craig@aland.bbn.com>
There are now strong signs that research and development in gigabit networking
has begun to make that critical move from paper studies to real systems of
fiber, silicon and lasers. First, we're beginning to see a flood of papers
from researchers who have built at least some hardware. Two different papers
on recently constructed ATM (Asychronous Transfer Mode) interfaces were
published at SIGCOMM '91. The folks at Cambridge University have been
reporting interesting work with their 600Mbit/second prototype of the Cambridge
Backbone Ring. And IBM-Zurich demonstrated its gigabit LAN at a telephony
conference this fall. (Indeed, it is somewhat sobering truth that we may be
innundated with gigabit literature in 1992.) A second, and possibly more
important, development is that the computer communications community has begun
to get seriously involved in the process of making standards for future gigabit
networks. In particular, the computer communications community began to get
involved in Broadband ISDN (B-ISDN).
The standards process for Broadband ISDN (which is built on ATM) has been
underway in CCITT for a few years now. B-ISDN is the technology that the
telephony community plans to deploy in the coming decades to serve a wide range
of voice and data communications requirements. Before late 1990, almost no one
in the computer communications community (people worried about making computers
communicate) had looked very closely at the B-ISDN standards. By late 1991,
the computer communications folk had taken a close look at B-ISDN and concluded
that it didn't adequately support the transmission of datagram traffic (a big
concern for protocols like IP!).
So in late 1991 a consortium of computer companies (Apple, BBN, DEC, IBM
Motorola/Codex, Sun Microsystems and Xerox) brought their concerns before the
US ANSI T1S1.5 standards committee in the form of a proposal called SEAL to
augment the B-ISDN standards. ANSI and CCITT are trying to wrap up the initial
B-ISDN specifications so this late appearance by the computer companies could
have caused problems. But instead, in a pleasant case of the standards process
working as it should, the consortium's contributions were welcomed and the
committee agreed to ask for a change to the ATM header to support the SEAL
proposal. This change will make it possible to experiment with implementing
datagram protocols over B-ISDN. (Some of this implementation work will be done
in conjunction with the IETF. Send mail to atm-request@bbn.com to join the
IETF discussions). The plan is to take the results of this experimentation and
incorporate it into the next standards release.