Twisted Pair (Tp) Cable Transmission Distance; Tp Skew Equalization - Extron electronics MTPX Plus 816 Setup Manual

Introduction, cont'd

Twisted Pair (TP) Cable Transmission Distance

C Do not connect this device to a computer data or
telecommunications network.
The maximum distance is determined by the frequency and
resolution of the signal that is input to the transmitter or to
one of the local inputs of the matrix switcher. The table below
specifies the recommended maximum transmission distances
using Extron Enhanced Skew-Free
CAT 5, 5e, or 6 cable, terminated with RJ-45 connectors.
Recommended transmission distances at 60 Hz
High quality transmission
maximum distance
Video
format MTPX input MTPX output
Composite,
700 feet 700 feet
S-video,
(215 m) (215 m)
Component
550 feet 600 feet
640 x 480
(185 m)
(165 m)
500 feet 500 feet
800 x 600
(150 m) (150 m)
450 feet 450 feet
1024 x 768
(135 m) (135 m)
350 feet 350 feet
1280 x 1024
(100 m) (100 m)
300 feet 300 feet
1600 x 1200
(90 m) (90 m)
For any transmission distances beyond 350 feet (100 m), turn
on the pre-peak function on the transmitting device (MTP
transmitter or MTPX Plus) . See the MTP Transmitter/Receiver
User's Manual and/or the
on page 4-8.
N The minimum TP cable length should be 25 feet (7.6 m).
N It is possible to exceed the recommended distance; however,
image quality may be reduced.
N The transmitters, receivers, and matrix switcher are
designed for and perform best with Extron Enhanced
Skew-Free A/V cable terminated in accordance with the
TIA/EIA T 568 A wiring standard. CAT 5, 5e, and 6
cables are acceptable, but less preferable. Extron also
recommends the use of preterminated and tested cables.
Cables terminated on site should be tested before use to
ensure that they comply with Category 5 specifications.
1-4 MTPX Plus Series • Introduction
Refer also to the MTPX Plus User's Manual at www.extron.com.
A/V UTP cable or UTP
™
Variable quality transmission
maximum distance
MTPX input MTPX output
750 feet 750 feet
(230 m)
(230 m)
600 feet 650 feet
(185 m) (200 m)
600 feet 600 feet
(185 m) (185 m)
550 feet 550 feet
(168 m) (168 m)
450 feet 450 feet
(135 m) (135 m)
450 feet 450 feet
(135 m) (135 m)
"Output pre-peaking SIS commands"
The recommendations shown on the preceding page
N
apply equally for a transmission line consisting of a
single transmitter, the switcher, and a receiver; and for
a transmission line that encompasses a transmission
daisy chain. For example, the maximum suggested range
for 1024 x 768 video output by the switcher is 550 feet
(168 m) with Pre-Peak on whether the transmission line
consists of the transmitter, switcher, and a single receiver
or a transmitter, the switcher, and three daisy-chained
receivers.
N For daisy-chained units, the first receiver in the chain
should be at least 50 feet (15 m) from the switcher when
the Pre-Peak feature is on.
N For daisy-chained units, any receiver in the chain closer
than 350 feet (105 m) may experience some form of over-
peaking when the Pre-Peak switch is on.

TP Skew Equalization

Skew exists between wire pairs when the physical length of one
wire pair is different from another. Skew affects the displayed
image when the difference in length between wire pairs exceeds
2 feet. The difference in length causes the timing of the red,
green, and blue video signals to appear out of alignment
(horizontal registration errors). The signals transmitted on the
shortest pair are shifted to the left if you are using white lines
on a black background. A white vertical line on a black field
can appear as individual red, green, and blue lines that are close
together; the signal transmitted on the shortest wire pair leads
the other colors and appears to the left on the display. As the
transmission cable length increases, the skew effect increases.
The MTPX Plus input and output skew equalizer functions
provide separate time delay circuits on the red, green, and blue
video lines. This allows you to properly align the red, green,
and blue video signals on the displayed image. When correctly
set, the red, green, or blue video signal on the shortest wire pair
is delayed to properly converge the displayed video image.
UTP cable test equipment measures and reports wire pair
length. The report on the various pair lengths can be used to
properly equalize pair skew. If UTP cable test measurement
cannot be done, pair skew can still be equalized by viewing a
crosshatch test pattern with a critical eye.
MTPX Plus Series • Introduction
Refer also to the MTPX Plus User's Manual at www.extron.com.
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