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CHAPTER 3: Configuration
3.2 Setting the Cable-Length Jumpers in All Non-Micro Remote Units
The full-size (non-Micro) Remote Units contain video-equalization circuitry which
compensates for the loss in image quality that occurs when you drive video across
long cables. With cables in the neighborhood of 300 meters (1000 feet) long, this
loss is considerable.
There are three jumpers on the main circuit board of these Remote Units that
you can use to select an equalization-adjustment range appropriate to the length of
the interconnect cable you’ll be running between the Remote Unit and the Local.
(Figure 3-1 on the next page shows where these jumpers are.) Once you set them,
you can alter the compensation level with the two rotary controls on the Remote
Unit’s front panel while the Extender is operating in order to “tune in” the image
more precisely (see
Section 4.4
).
The three cable-length jumpers should be set as follows (
all three jumpers must be
set the same way
):
Cable Length in
Jumper
Meters (Feet)
Position
0 to 100 (0 to 330)
Off
(factory default)
100 to 200 (330 to 655)
A
200 to 300 (655 to 1000)
B
NOTE
If you will be running cable to near the limit of one of these cable-length
ranges, say as far as 80 m (260 ft.), and you will be using high-resolution
(1024 x 768 or higher) video, you might be able to achieve more accurate
video compensation (see
Section 4.4
) by selecting the higher cable
length range (the 100-to-200-m range in this case).
If you are conducting a same-room test prior to your final installation, as we
recommend—see the “Test-Placing the Extender” section in the users’ manual for
your Extender system—set the jumpers as appropriate for the length of the test
cable first; then, if the Units pass the test, reset the jumpers for your actual
installation length.
