The IQ application will be briefly unavailable on Sunday, March 31st, starting at 10:00am ET. Access will be restored as quickly as possible.
Browse Prior Art Database

Minutes of Network Graphics Group meeting, 15-17 July 1973 (RFC0549)

IP.com Disclosure Number: IPCOM000006055D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 12 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.C. Michener: AUTHOR

Related Documents

10.17487/RFC0549: DOI

This text was extracted from a PDF 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...