Medical School Administration
Go-Cart prototype is a mobile video conferencing unit featuring digital
video quality. It can be easily moved
from one office or hospital room to another.
To move the Go-Cart, simply unplug the power and ethernet cables
and you're ready to roll! The Go-Cart is built from readily
available, inexpensive components and supports the following Video
Learn more about Go-Cart:
- DVTS - (Digital Video Transport System) DV quality video,
requires a network connection capable of
- ConferenceXP - requires a network connection capable of 10 mbps
- Adobe Connect (formerly called "Breeze") - requires a network
connection capable of 6 mbps
- Access Grid - requires a multicast network connection capable of
If you're wth the UMMS, you can make arrangements to use the prototype
Go-Cart by contacting
(kkost @ umich.edu), Office of Enabling Technologies, Medical School
Administration, University of Michigan.
If you're not with UMMS but are interested in borrowing the Go-Cart,
pleas contact Bob Riddle (bdr @ umich.edu), Office of Enabling
Technologies, Medical School
Administration, University of Michigan.
The goal was to create a mobile, DV capable video collaboration tool
from affordable, available components that is usable, reliable, and
High quality video was desired so the "better than H.323" video choices
were HD and DV. Low latency transmission was desired, thus
uncompressed DV video was chosen
and a Sony HandyCam is used as the video capture device.
Good audio without "echo" was desired. While there are many
devices that deal with echo cancellation, a ClearOne Chat 50
was chosen because it is affordable, extendable, provides good
quality audio and compares favorably to other devices in the same
Since DVTS capability exists in
the hardware (Comet PMC) and software, we chose the solution that
the least amount of hardware with the most common user
interface. The DVTS freeware is being run on a
Windows XP machine.
A 22” computer monitor is used to capitalize on the ability to present
an HD (high definition) perspective (16x9).
A Sony HandyCam DCR HC1000 NTSC unit is used for video
capture on the
Go-Cart. Any "HandyCam" that support IEEE 1394 (firewire) and an
external microphone may be used.
A Chat 50 echo cancellation device is used as
both microphone and speaker. A microphone cable is plugged
plug seen in the HandyCam picture) from the back of the Chat 50 and a
speaker cable is plugged into the speaker port on the computer from the
back of the Chat 50.
Wireless keyboard and can
easily be removed from the cart and used anywhere in the vicinity.
The computer hosting the Windows XP version of the DVTS
software is a Mac-mini. (That's right, a Macintosh
computer was chosen because of the price, the small physical
footprint, and because is it a very quiet
We also installed an Uninterruptible Power Supply (UPS)
so the Go-Cart is immune to local power failures during a video
conference. The current estimate is that the UPS will power the
Go-Cart equipment for up to 60 minutes.
howto: do a DVTS
Let's assume you're logged into the Windows machine. You should
see something like this on the monitor:
After you make sure the camera is on and working, Select the icon that
is labelled "DVTS Video Conference" double click it to launch the DVTS
You should now see a window that looks like this:
The "DV Send" section of the window contains the parameters that
control the sending of video and audio. The lower half of the window,
"DV Receive" contains the parameters that define the stream that will
Sending your video across the network:
1. select the "DV" device from the pull down menu. Your
like selection option will be "Sony DV Device"
2. fill in the "Destination" text box with the IP address of where you
wish to send you audio & video
a) if this is another machine, then
enter the IP address of that machine (the unicast address)
b) if this is to be seen by multiple
machines, then enter the multicast address and then
make sure to fill in
the "Multicast TTL" with a number, 64 is suggested.
3. if you want to see the video that is being sent, then click on the
4. click on the "Start Send" button to begin sending the video to the
If you chose the "Preview Monitor", another window will open and
you will see the video being captured & sent from the camera.
If there is no video in that window, make sure your camera is turned on
and plugged into the computer.
video from the network:
If you need to receive a unicast stream from another DVTS node, then
click on the "Start Receive" button.
If you need to receive a DVTS multicast stream, then fill in the text
box "Multicast Group" with the multicast address as shown below.
Then click on the "Join" button and you are done.
Another window should open, displaying the video being sent from the
specified endpoint. If no video window opens, it means you
are not receiving the specified video stream.
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