Extron Electronics System 8_10 Plus - Manual (Page 25)

Extron • System 8/10 P LUS • User’s Manual
Rear Panel Connections Video Loop Back
2-10
Video Loop Back (VLB)
Video Loop Back (VLB) is a special feature which allows a scan doubler (also
called “line-doubler”) or an RGB decoder to be used with the System 8/10 P
LUS
switcher. With VLB enabled, any input can use an RGB decoder or a scan
doubler without recabling. This reduces the amount of equipment needed for a
system that requires the use of either of these devices.
The VLB mode is turned on and off by a toggle switch located between output
connectors on the right, rear panel of the System 8/10 P
LUS
. With the switch in
the NORM (up) position, the VLB mode is disabled. In the VLB (down) position,
Video Loop Back is enabled.
To configure the System 8/10 Switcher for Video Loop Back, connect the
Composite video or S-video output(s) source to a System 8/10 P
LUS
input.
Connect the output of the System 8/10 P LUS S-Video and/or Composite video to
the input of the decoder or line doubler. Then connect the RGBS output of the
decoder or scan doubler to the last input of the switcher. Only the last input can
be used as VLB input. That is, input #8 of the System 8 P
LUS
, or input #10 of the
System 10 P LUS .
_____ When connected for Video Loop Back, the number of usable inputs is reduced
by one because VLB uses the last input.
Normal Mode
The VLB switch is set to NORM and no decoder or scan doubler is connected.
When Composite and S-Video input signals are selected, they are routed directly
to the projector (or display monitor) through the normal Composite and S-Video
output connector set.
VLB Mode
Set this switch to the “VLB” position when an external decoder or scan doubler is
connected, as pictured on the following page. When a Composite or S-Video
input signal is selected, it goes through the normal Composite or S-Video output
connectors to an external (user provided) Composite-to-RGB decoder or scan
doubler. The RGBS output of the decoder or scan doubler is “looped back” to the
last input of the System 8/10 P
LUS . The decoded (or scan doubled) RGBS signal
is then routed directly to the projector (or display monitor) from the System 8/10
P
LUS
RGBS output connectors (see diagram on the following page).
Optional Extron Products that can be used with a System 8/10 Plus in Loop Back
mode include:
• CD 400 – Quad Standard Decoder 60-145-01/02
• Lancia – NTSC & PAL Scan Doubler 60-213-01
• Sentosa – High Resolution Video Line-Quadrupler 60-229-01
VLB Restrictions
• When using the VLB mode with multiple switchers, always connect the
switchers in a Star Configuration. The VLB mode cannot be used when
switchers are connected in a Daisy-Chain configuration.
• Only the master switcher can use the VLB mode (slave switchers cannot).
• Refer to Chapter 5 for instructions on looping switchers in the Star
Configuration.
• For projectors that accept S-video and Composite video signals on their
RGBHV port, VLB can only be used when the System 8/10 P
LUS
is no longer
in cable saver mode (see page 3-4 for SW settings).