Telecom-REQUEST@MIT-XX.ARPA (Moderator) (09/05/85)
TELECOM Digest Wednesday, September 4, 1985 9:52PM
Volume 5, Issue 32
Today's Topics:
Re; Satellite viewing "freedoms"
conference calls
seminar poster
X.PC protocol
Re: X.PC protocol description available
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Date: 3 Sep 85 09:23:23 PDT (Tuesday)
From: LLi.ES@Xerox.ARPA
Subject: Re; Satellite viewing "freedoms"
I agree with the views stated in your message, except I think that
you're soft on the issue of microwave telephone signals. I think that
the entire electromagnetic spectrum belongs to the people, just like the
air we breathe. The people of this country entrusts the Government/FCC
to regulate the use of this public resource, and in no way should the
Govt. take away the freedom of the people to benefit from the public
resource. Can you imagine that the Govt. tells you where you're allowed
to breathe air and where you're not allowed?
If someone wants to use this public resource -- the electromagnetic
spectrum, then anyone else should have the right to receive the signal
and do whatever they want with it, basically that's the price you pay
for the privilege of using a public resource. If you're not willing to
let the public use your signal, then try to use a private channel such
as a fiberoptic link.
Leonard.
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Date: Tue, 3 Sep 85 12:58:00 edt
From: ulysses!smb@Berkeley (Steven Bellovin)
Subject: conference calls
Given that I have two phone lines, how can I hook things up so that I can
make a conference call? I only need this capability rarely; it doesn't
pay to get three-way calling or a special phone -- the second line is almost
always talking to a modem or two.
--Steve Bellovin
ulysses!smb@berkeley.arpa
smb.ulysses.btl@csnet-relay
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Date: Wed, 21 Aug 85 09:53 EDT
From: Kahin@MIT-MULTICS.ARPA
Subject: seminar poster
Massachusetts Institute of Technology
Communications Forum
Satellite Television, Signal Encryption,
and the Future of Broadband Distribution
September 19, 1985
Technology Session -- 2:00 [slightly smaller than preceding line]
Allen Ecker, Scientific Atlanta
Jerrold Heller, M/A Com Linkabit
Policy Session -- 4:00 [same as 2:00 line]
John Sie, Tele-Communications, Inc.
Roy Neel, Legislative Director for Senator Albert Gore Taylor
Howard, Chaparral Communications/SPACE/Stanford University
Until recently, direct satellite broadcasting (DBS) was commonly
envisioned as small packages of encrypted programming services delivered
via high-powered Ku-band satellites. However, "C-Band Direct," widely
known as "satellite television," has emerged as the established form of
DBS: over a million homes with large dish antennas that receive upwards
of 50 C-Band signals intended for distribution by cable television
operators. Since these viewers generally pay nothing for programming,
they and the hardware industry they support have been criticized much as
broadcasters criticized the early cable industry. Satellite television
antennas are now appearing inside cable franchise areas, prompting
increasing demands for signal scrambling that would force satellite
television viewers to pay for programming.
Encryption -- especially the millions of decoders required -- will
be very costly. Who will pay for it? Who will retail the programming
to homes? At what price? Will basic services be available unbundled?
Can antitrust and standards problems be avoided? The choice of
scrambling technology will affect other technological innovations, such
as enhanced NTSC and digital television. And, over the long run, the
development of satellite television and the response of the cable
industry will profoundly affect the economics, design, and
implementation of switched broadband networks.
The Wireless Office
September 26, 1985
Michael Marcus, FCC
Payne Freret, Consultant
Kaveh Pahlavan, Infinet
Wireless office communication using radio, infrared, and optical
frequencies offers interesting advantages over conventional office
communication. Although it has been studied for some time, few
commercial products have appeared. However, recent FCC filings have
requested allocation of radio frequencies for office communication, and
the FCC has decided to allow the use of spread spectrum modulation.
This seminar will examine the technologies that have been proposed,
why many have not been successful, the impact of recent
FCC decisions, and the economics of wireless systems.
What's the Matter with 3-D?
October 10, 1985
Stephen Benton, MIT/Polaroid
Rene Paul Barilleaux, Museum of Holography
William Paul, MIT
The most notable success of 3-D has been as a kind of fairground
attraction, but new technologies have extended the range of
applications. This seminar will consider the limited success of 3-D by
looking at traditional 3-D photography, holography, and computer graphic
holography. Past, present, and future uses will be explored, ranging
from entertainment to to non-imaging uses of holography.
The Political Impact of the New Communications Media
October 17, 1985
Jeffrey Abramson, Brandeis University
Christopher Arterton, Yale University
Gary Orren, Harvard University
The role of electronic media in American politics has been widely
discussed and analyzed for more than three decades. However, most
studies have examined the effects of broadcast television, and little
attention has been paid to newer media, such as cable television. The
participants in this seminar will present findings from their
forthcoming book on the effects of new media technologies on citizen
participation, electoral outcomes, and effective governance.
A New Research Organization
for a Disintegrated Telecommunications System
October 24, 1985
Alan G. Chynoweth, Bell Communications Research
The breakup of the Bell System led, among many other things, to the
formation of a major new research and development organization to serve
the seven regional companies. Bell Communications Research ('Bellcore')
is learning how to serve and interact with the restructured
telecommunications industry and to interface with the world of relevant
science and technology. This talk will describe this new type of R/D
organization which focuses on service in the Information Age rather than
on manufacturing in the Industrial Age. The focus will be on research
activities, with an account of many of the problems and challenges, both
organizational and technical, that have been addressed in establishing
this new role within the evolving telecommunications scene.
Bartos Theater
The Wiesner Center for Arts and Media Technology
(Building E-15, 20 Ames St.)
Massachusetts Institute of Technology
Cambridge, Massachusetts
Thursday, 4:00 to 6:00 p.m.
(excepted as noted)
For further information please call (617) 253-3144. [small
type centered across the bottom]
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Date: Wed 4 Sep 85 15:56:59-MDT
From: The alleged mind of Walt <Haas@UTAH-20.ARPA>
Subject: X.PC protocol
The X.PC protocol seems to combine the X.25 packet level with certain
features of DDCMP, ie. the technique of providing one CRC for the header,
containing the length of the data, and another CRC for the data.
The packet sequence numbering scheme of X.PC differs from that of X.25
in that only the data packet of X.25 has a sequence number, whereas all
packet types of X.PC have a sequence number (which contains zero in the
restart request/indication, reset request/indication, RR, RNR and REJ
packets). It is not at all clear to me what use can be made of the sequence
number in a call request/incoming call, call accepted/connected, restart
confirmation or reset confirmation packet, since the sequence number should
always be zero by any interpretation I can think of. Furthermore, the
technique of putting a sequence number on the interrupt packet may cause
it to be blocked by flow control, which would prevent it from accomplishing
its intended purpose.
Regards -- Walt
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Date: Wed, 4 Sep 85 11:37:34 pdt
From: sun!l5!sunny@Berkeley (Ms. Sunny Kirsten)
Subject: Re: X.PC protocol description available
Please correct my mailing address to ...{ucbvax,decvax,ihnp4}!sun!l5!sunny
Sunny, KA6PPP
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End of TELECOM Digest
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