Installation and Operation, cont’d

Skew exists between pairs when the physical length of one wire pair is different from another. As the transmission cable length increases, the amount of skew increases. Skew affects the displayed image when the differential length between wire pairs exceeds 2 feet, causing the timing of red, green, and blue video signals to appear out of alignment (horizontal registration errors). 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.

UTP cable test equipment measures and reports wire pair length. The report on the various pair lengths can be used in equalizing pair skew. The nominal velocity of propagation (NVP — the speed at which the signal travels on the transmission line, measured as a percentage of the speed of light) of TP cable is very close to that of conventional coaxial cable. The similarity in NVP means that an additional length of coax equal to the length of pair skew, placed on the receiver output, equalizes the effects of pair skew (figure 2-11).

If UTP cable test measurement cannot be done, pair skew can still be equalized by viewing a test pattern with a critical eye. Examine the test pattern for loss of horizontal registration and, through a process of trial and error, equalize any pair skew with coax extensions on the red, green, and/or blue outputs.

TP T 15HD A

AUDIO

COMPUTER

 

 

IN UT

BUFFERED

 

 

 

 

 

 

LOCA M

H-

Audio

 

IT

SHIFT

 

 

 

IF cable measurement indicates that the pair with wires 1 and 2 is four feet shorter than the other pairs...

 

V

 

H/HV

 

OUTPUT

B

RGB

G

R

 

INPU

T

RGB

 

 

 

AUD

IO

TP R BNC A

PC Computer

CAT 5 UTP Cable

Pair

RGB video

... THEN insert a four foot

 

 

 

 

1, 2

Red

extension cable to equalize

LCD Projector

4, 5

Green

TP skew for red video.

 

 

 

7, 8

Blue

 

 

Figure 2-11 — Pair skew equalization

2-18 TP Receivers • Installation and Operation

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Extron electronic TP Receivers user manual Pair skew equalization
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TP Receivers specifications

Extron Electronics, a leading manufacturer in the field of audiovisual technology, offers a comprehensive range of TP (Twisted Pair) Receivers designed to cater to the demanding needs of modern AV environments. These devices are essential components in transmitting high-quality video, audio, and control signals over extensive distances using standard twisted pair cabling, such as Cat 5e or Cat 6.

One of the main features of Extron TP Receivers is their exceptional signal integrity. They employ advanced signal processing techniques to ensure that video resolutions up to 4K are delivered without degradation over long distances. This capability makes them ideal for use in educational institutions, corporate environments, and command-and-control applications where clarity and precision are paramount.

The technology behind Extron TP Receivers includes proprietary algorithms that optimize the transmission of video signals. This results in minimized latency and enhanced picture quality, providing an experience that is indistinguishable from direct connections. Moreover, the receivers support both HDBaseT and Extron’s own IP-based protocols, offering flexibility in system design and integration.

Additionally, Extron TP Receivers are equipped with built-in scaling capabilities. This feature allows users to convert incoming video signals to a desired resolution, accommodating various display formats and ensuring compatibility with legacy equipment. This adaptability further extends the usability of the devices across diverse applications.

Another noteworthy characteristic of Extron TP Receivers is their compatibility with various control systems. They can seamlessly integrate with Extron’s Global Control Network, allowing for centralized management of AV resources. This is particularly beneficial in large installations where multiple devices need to be controlled and monitored from a single interface.

Ease of installation is another hallmark of Extron’s design philosophy. TP Receivers come with user-friendly connectors and mounting options, facilitating straightforward integration into existing systems. The devices feature robust construction, ensuring long-term reliability in demanding environments.

In conclusion, Extron Electronics’ TP Receivers are positioned as versatile and high-performance solutions for AV signal transmission. With their emphasis on signal integrity, advanced technology, scalability, and ease of use, they are well-suited for a variety of professional applications, enhancing the overall audiovisual experience. Whether it's for large auditoriums or small conference rooms, these receivers are an integral part of any modern AV system.
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