Skip Navigational Menu and go to Main Page Content
What's New
About ADEC
Privacy Policy
Security and Privacy
Shop at the ADEC E-Store
IDEAL
Learning Resources
Courseware Tools
Satellite Resources
Federal Programs and Grants
Agricultural Telecommunications
NSF Project
eArmyU
Internet and Electronic Trends
Accessability Issues
Standards and Plans
International Cooperation
Conferences and Workshops
Virtual Universities
Internal Management
Search
Help
Distance Education... Distance Education... Distance Education...

Date: Wed, Sep 04 2002
From: Bob Dixon
Subject: Continued H.323 testing
To: ADEC Applications Team

Today we conducted H.323 video tests between two CPEs. One is the
fixed OARNet CPE and the other is our trailer-mounted system. This
phase of the testing is now complete.
The remaining phase is to do a multipoint test. We would like to do
that this Friday Sept 6 at 1 PM EDT. We have the equipment and people
all ready to go. Is that possible?

Some preliminary and yet-to-be-confirmed results are that the
software update that Tachyon installed in all CPEs this past week
seems to have made a significant improvement.

1. The CPE ethernet interface now goes up to 100 Mb full duplex,
whereas it previously went to only 10 Mb half duplex. This reduces
congestion on the local LAN, if you are using a device that can
operate at 100 Mb full duplex. A Polycom model FX can do this, and we
found zero packet loss from the San Diego router to the local FX
Viewstation connected to the trailer CPE. But we found 3 % loss to
a model 128 Viewstation connected to the fixed CPE which can only do
10Mb half duplex. More later on this.

2. The video is quite good from CPE to CPE. Better than we expected.

Bob

Robert S. Dixon, Ph D, PE
Chief Research Engineer
Ohio State University, Office of the CIO
and Ohio Academic Resources Network (OARNet)

Postal address: Office Telephone: 614-292-1638
Office of the CIO
Room 451 Baker Systems Engr Lab Telephone: 614-292-7425
Ohio State University Fax: 614-292-7081
1971 Neil Ave Email: Bob_Dixon@osu.edu
Columbus, OH 43210

"This material is based upon work supported by the National Science Foundation under Grant No. 0073240. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."
 
  E-mail Site Manager:
webmaster@adec.edu
Last Updated: September 10, 2002