Video Lab Overview
Almost all of the equipment in the video lab racks is software
controllable through a big matrix routing switcher. Most common tasks
can be accomplished through the Web imagemap
interface. Click with the middle mouse button on a source, and
then with the left mouse button on a destination. That's it. We have
pictures for most the equipment, and text for everything. Both are
clickable. Note that when you move the mouse over something, you can
see its name.
Each piece of equipment has its own page. All these pages are linked
into the equipment page, including some
stuff like cameras that aren't routable. Most of the equipment pages
have a thumbnail picture of the device on the page, along with its
English name, model number, and the machine-readable (telect) name.
Many common tasks are explained on the tutorials page.
Most video equipment in the lab can act as some combination of source,
sink, or bridge. For instance, a monitor is a sink. A camera is a
source. A tape deck is both a source and a sink. An NTSC encoder is a
There are six "levels" in the main matrix routing switcher. Each level
carries a different kind of signal. Below are the levels, with
official names first:
There are many ways to convert from one level to another. The most
general purpose bridges are the DPS timebase corrector/transcoders.
For the common case, just use the imagemap interface to bridge through
- NTSC (VHS, composite)
- CAV (YUV, component)
- Y/C (S-VHS)
- SDI (digital, CCIR-601)
- RGBS (RGB, component)
The Web imagemap interface routes all levels. For more
fine control, you can use the "telect" client directly. See the telect client page for details on
the command-line syntax.
There is a seventh level which is not in the Telect matrix. The
high-bandwidth RGBS signals are routed through a manual patch
panel, which is not computer controllable. A high-bandwidth RGBS
signal is usually the output of a computer - for instance, a
1280x1024 screen. Sources are usually computers, sinks are
usually high-end monitors or projectors.
Yet another (eighth) level is the manual patch panel for deck control
and keyboards/mice. See the Control Patch
Panel (RS-422) page for more details.
You may wonder why both the CAV and RGBS are called "component". This
has been a big source of confusion. In video land, what they call
component is usually CAV. In the old rack, what we called component
was really RGBS. A few pieces of equipment (like the Lyon Lamb) can
handle both. Most decks take CAV in, but many monitors only take RGBS.
Currently, RGBS is deprecated and new items are added as CAV if
- There is a lot of documentation on these web pages, try reading them
- Note that most pages follow this page's format, with the
commonly needed information at the top, followed by more detail,
additional notes, then troubleshooting.
- Use the sgl-videolab@graphics alias
or the sgl-videoprod@graphics alias for questions, since that's read by all people involved in maintaining
the videolab and archived so the answers will be available for
- You can also browse for information in the videolab email archives.
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Last modified: Sun Apr 7 08:02:48 PST 2002