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Minutes of Network Graphics Group meeting, 15-17 July 1973 (RFC0549) Disclosure Number: IPCOM000006055D
Original Publication Date: 1973-Jul-17
Included in the Prior Art Database: 2001-Nov-29
Document File: 13 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.C. Michener: AUTHOR


Sunday evening, 15 July

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 15% of the total text.

Network Working Group                                          Anonymous

Request for Comments: 549      Center for Advanced Computation, U of Ill

NIC: 17795                                               15-17 July 1973


Sunday evening, 15 July

   The meeting came to order around 1930, Jim Michener presiding.  After

   introductions, an agenda was constructed for the rest of the meeting.

   Elaine Thomas distributed copies of an Alternative Network Graphics

   Protocol for attendees to read overnight prior to discussion.

   Because some individuals were absent who had definitely indicated

   that they were coming Monday morning, the meeting was adjourned at

   2030 after deciding to meet at 0930 the next morning.

Monday Morning/Afternoon, 16 July

   The meeting was called to order at 0930

   Jim Michener distributed an outline of a paper describing desirable

   facilities for the use of two dimensional input devices with a

   hierarchically structured display program.

   Ken Victor distributed copies of RFC 553: A Proposed Network

   Text/Graphics Protocol. (LJOURNAL,17810,)

   Ken Pogran described the history of the NGG and how the "levels"

   approach of RFC 493 came about.  In particular, the "level 0"

   protocol was an attempt to define something to experiment with, but

   with the thought that it should be possible to imbed "level 0"

   meaningfully in any later protocol.

   Reports of Network Graphics Experiences

      Jon Jervert described the installation at CAD/CAM (Fort Monmouth).

      They have a spectrum of display terminals and have tried several

      via a Telnet connection to MIT-DMCG.  They experienced

      unacceptable slowness with a 300 Baud bandwidth.

      Austin Henderson described an Air Traffic Control experiment in

      which the simulator receives codes describing changes in state and

      generates descriptions of the air space (region) being controlled

                                                                [Page 1]

RFC 549               Minutes of Network Graphics        15-17 July 1973

      and aircraft position and velocity.  These descriptions are highly

      encoded--they are not pictures in any general sense.  The rate at

      which the simulation proceeded was adequate.

      Jim Michener described the results of an experiment in which the

      E&S LDS-1 at MIT-DMCG was used to generate stylus inking input for

      a character recognition program at SDC.  The experiment was

      plagued with difficulties including bugs in SDC's NCP and

      scheduling of experimental/debugging sessions.  When the

      experiment was finally terminated (due to planned extensive

      hardware modifications at DMCG) a clear understanding had not yet

      emerged, but apparently network transmission delays had been

      experienced of up to 20 seconds.

      Dan Cohen described an Aircraft Flight Simulator which interacts

      with a user at the Harvard PDP-1.  The simulation takes place on a

      PDP-10.  Network traffic is approximately 200 bits from the PDP-1

      to the PDP-10 and several thousand bits in the opposite direction.

      It has been found that at least 5 updates are required per second

      to give the "pilot" an adequate feeling of control.  The Harvard

      PDP-10 and one at BBN have been used, the latter at 6 AM to avoid

      loading pr...