Extron electronics TPR101 Instructions d'exploitation télécharger pdf (Page 5)

ADVANTAGES OF CAT5 CABLE

Category 5 cable is a 4-pair, twisted pair cable that’s extremely affordable, costing only a fraction

of high-resolution multi-conductor coaxial cables. In addition, CAT5 cable features:

• Quick and Easy Termination - Utilizing RJ45 connectors, CAT5 cables offer fast, easy

and extremely economical cable terminations.

• Easy Handling and Compact Size - CAT5 cable is much thinner than high-resolution

and super high-resolution coaxial cables, providing easy cable pulls and preserving

conduit space. Using multiple TPT101 transmitters and TPR101 receivers allows users

to send a dozen or more RGBHV signals in the same conduit space required for a single

super high-resolution 5-conductor coaxial cable.

• INLINE CAT5 Cables - INLINE offers the IN9500 series of CAT5 cables, available in

lengths from 50 feet to 300 feet (longer lengths are available via special order). These

high quality CAT5 cables are pre-terminated with molded RJ45 connectors for enhanced

durability.

SELECTING THE RIGHT CAT5 CABLE

The CAT5 standard was created to address issues related to high bandwidth transmission of data

signals. CAT5 cables were not originally intended for video and audio signal transmission and

unfortunately, many performance characteristics that are important for good quality transmission

of video signals are not included in the CAT5 spec and are not tested by most cable

manufacturers. Many cable performance parameters such as attenuation, bandwidth, capacitance

and near-end cross talk are important to video performance; however, impedance and pair-to-pair

skew have the greatest effect when transmitting high-resolution video signals over CAT5 cables.

Impedance - There is a wide variance in impedance between different brands of cables. The TIA

/ EIA* standard for CAT5 impedance is 100 ohms -/+ 15 ohms. Some CAT5 cables have an

impedance of 100 ohms +/- 50 ohms, rendering them virtually useless above 10 MHz. The

visible result may be multiple images or “ghosting” in the displayed image.

Skew - Another factor that affects the performance of CAT5 cable is skew (timing differences on

multi-pair cable). Signals arriving at different times could result in misconvergence (improperly

aligned colors) on the video display device. To ensure good performance sending high-resolution

video signals over UTP cable using a typical CAT5 transmitter / receiver product, we generally

recommend that you select a CAT5 with less than 50 nanoseconds of skew per 100 meters of

cable. Because skew is cumulative, it becomes more visible with longer cable lengths.

Fortunately, the TPR101 receiver includes individual RGB skew timing controls to bring the

signals into time alignment, completely removing the visible effects of RGB skew timing delays.

For this reason, CAT5 cable skew performance is not as critical with the TPT101 / TPR101

twisted pair transmission system as it is with other CAT5 transmission systems.

Specialized CAT5 Cables

A few manufacturers have now responded with CAT5 cable formulations that are specially

designed to match the stringent requirements of high-resolution video signal transmission. A

major advantage of the TPT101 / TPR101 system are its sophisticated cable equalization and

exclusive RGB skew timing controls, which provide superb performance with virtually any CAT5

cable (specialized media-grade CAT5 cables are not required!)

*Telecommunications Industry Association / Electronic Industries Association

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Extron electronics TPR101 Instructions d'exploitation Page 5

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