Minutes of Network Graphics Group meeting, 15-17 July 1973 (RFC0549)
Original Publication Date: 1973-Jul-17
Included in the Prior Art Database: 2001-Nov-29
Internet Society Requests For Comment (RFCs)
Sunday evening, 15 July
Network Working Group Anonymous
Request for Comments: 549 Center for Advanced Computation, U of Ill
NIC: 17795 15-17 July 1973
MINUTES OF NETWORK GRAPHICS GROUP MEETING
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
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