SW Switchers • Installation
SW Switchers • Installation
Installation, cont’d
(Y) cable to the Y input, and connect the chrominance
(C) input cable to either the R-Y or the B-Y input.
If auto-switching for composite or S-video is
required, use a T connector as described in “Input
cabling for auto-switching” on the previous page.
Looping
Looping is a configuration technique that enables the total
number of inputs to a switcher to be increased by
connecting its highest input to the output of another
switcher. Extron’s SW switchers are restricted to the daisy
chain looping configuration, which is described in this
section.
A path is created through the connected switchers for the
video signals from the selected input:
• For SW AR
xi
and SW AR HV
xi
switchers, the path is
created by contact remote connector loop control
signals. See page 2-16 for contact remote connector
pin assignment information.
• For SW AR MX and SW AR MX HV switchers, the path is
created by loop control signals “Loop Out” and
“Loop In”.
The SW 2 AR MX and SW 6 Component switchers
do not support looping.
Looping switchers — how it works
Examples of daisy chain looping configurations using three
switchers are shown on page 2-12. Figure 21 shows three
SW 6 AR HV
xi
switchers, and figure 22 shows the same
configuration for three SW 6 AR MX HV switchers. In the
example:
• Switcher C has six inputs available, and its output is
connected to input 6 of switcher B.
• Switcher B has five inputs available, plus the six from
switcher C, for a total of 11 inputs. Switcher B's
output is connected to input 6 of switcher A.
• Switcher A has 5 inputs available, plus the 11 from
switcher B (switcher B's five plus switcher C's six),
for a total of 16 inputs.
Additional switchers could be connected to the string of
switchers in the example. However, video signal
degradation could become a serious factor as cable length
increases. Signal degradation is also affected by the quality
of the cables used.
Input cabling for auto-switching
This section applies to SW AR
xi
, SW AR HV
xi
,
SW AR MX, and SW AR MX HV switchers only.
It does not apply to the SW 6 Component switcher.
For proper auto-switch operation, the switcher control logic
must detect horizontal or composite sync pulses on the H/S
sync input connector. Video on the sync input connectors is
not passed to the output. This means the sync portion of
composite video, S-video, component video, and RGsB
signals must be connected to a video input and to the H/S
input through a T connector. Connect the input cables as
follows:
Composite video —
Connect the input cable through a
T connector to the R, G, or B input and to the H/S
input.
S-video —
Connect the luminance cable through a
T connector to the R, G, or B input and to the H/S
input. Connect the chrominance cable to one of the
remaining R, G, or B inputs.
Component video —
Connect the Y cable through a T
connector to the G input and to the H/S input.
Connect the R-Y and B-Y cables to the R and B
inputs, respectively.
RGsB —
Connect the green video signal cable through a
T connector to the G input and to the H/S input.
Connect the red and blue signal cables to the R and B
inputs, respectively.
Input cabling for audio follow
Audio follow can be used with composite or S-video to
allow switching of both audio and video signals. S-video
requires two of the three video input connectors, leaving
only one input available for audio (audio on sync inputs
will not be passed to the output). Use the following
guidelines for audio follow cabling:
• For composite video input, connect the video cable to the
R, G, or B input (Y input for SW 6 Component), and
connect the two audio channels to the remaining
video inputs.
• For S-video input, connect the luminance (Y) and
chrominance (C) input cables to any combination of
the R, G, or B video inputs. Use the remaining video
input for one channel of audio. For an
SW 6 Component switcher, connect the luminance
2-11
2-10
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