Extron electronic MTPX PLUS 816, MTPX PLUS 168, MTPX PLUS 1616 TP Skew Equalization, Video, Format

Introduction, cont’d

Twisted Pair (TP) Cable Transmission Distance

CDo 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™A/V UTP cable or UTP CAT 5, 5e, or 6 cable, terminated with RJ-45 connectors.

Recommended transmission distances at 60 Hz

	High quality transmission		Variable quality transmission
Video	maximum distance		maximum distance
format	MTPX input	MTPX output	MTPX input	MTPX output
Composite,	700 feet	700 feet	750 feet	750 feet
S-video,	(215 m)	(215 m)	(230 m)	(230 m)
Component
640 x 480	550 feet	600 feet	600 feet	650 feet
	(165 m)	(185 m)	(185 m)	(200 m)
800 x 600	500 feet	500 feet	600 feet	600 feet
	(150 m)	(150 m)	(185 m)	(185 m)
1024 x 768	450 feet	450 feet	550 feet	550 feet
	(135 m)	(135 m)	(168 m)	(168 m)
1280 x 1024	350 feet	350 feet	450 feet	450 feet
	(100 m)	(100 m)	(135 m)	(135 m)
1600 x 1200	300 feet	300 feet	450 feet	450 feet
	(90 m)	(90 m)	(135 m)	(135 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 "Output pre-peaking SIS commands" on page 4-8.

NThe minimum TP cable length should be 25 feet (7.6 m).

NIt is possible to exceed the recommended distance; however, image quality may be reduced.

NThe 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

NThe recommendations shown on the preceding page 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.

NFor 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.

NFor 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 1-5

Refer also to the MTPX Plus User’s Manual at www.extron.com. Refer also to the MTPX Plus User’s Manual at www.extron.com.