Sharp LC-28HM2 Spezifikationen PDF herunterladen (Seite 2)

2 ExtroNews 12.2 March/April 2001

Twisted Pair Transmitters and Receivers (cont.)

In any A/V system, the displayed image

quality is only as good as the weakest link in

the video signal chain. In most cases, that

weakest link is the cable. This holds especially

true for UTP transmission systems. To achieve

the best possible image quality with a UTP

system, the highest quality UTP cable,

connectors, and patch cords available should

be used. At this time, Category 6 rated UTP

cable is manufactured to the most exacting

specifications. Designed for Gigabit Ethernet,

CAT 6 cable provides 250 to 350 MHz of

bandwidth as well as the best crosstalk and

attenuation specs available for UTP cable. To

run video over UTP and get professional

results, Extron has designed a transmission

system to compensate and correct for signal

losses that occur during a UTP cable run.

However, for best results, it is important to

know the kind of transmission cable that

connects the transmitter to the receiver.

Although UTP cable installed in a facility can

be used, it is important to note that this cable

may be of unknown quality and has been

designed for computer network use with

termination in an IP network patch bay, digital

switching system, or router. The balanced

analog video signals transmitted by Extron

transmitters are not compatible with digital

network equipment. Mixing signals can cause

damage to a router if a signal is mistakenly

connected to the wrong piece of equipment. If

possible, a UTP video system should be treated

as an A/V system with all signal cables and

connections kept separate from the computer

and data systems in a facility. When possible, a

direct cable run from transmitter to receiver

should be used. (For more information on UTP

Cabling, see the Tech Corner article in this

issue on page 22.)

Extron UTP Products

Extron’s family of Twisted Pair transmitters

and receivers are designed to integrate

Twisted Pair cabling into analog A/V systems.

Our Twisted Pair solutions are designed to be

used the way A/V system designers and

installers build systems—offering the

compact size, connectorization, remote

control capability, and mounting

configurations needed for architectural

integration plus the level and peaking control

needed for high performance.

Extron offers a versatile class of

transmitters and receivers that enable long-

distance transmission of RGB video,

• At a large venue awards presentation,

audience members in the back of the

auditorium use monitors to get close-up

views of the onstage action. For long cable

runs from the A/V rack to the ceiling-mounted

monitors, UTP cable is more economical.

• For a

staging event or tradeshow, the

A/V crew needs to quickly run temporary

cabling that can be taken down with no

hassle—or even discarded at little cost.

• A

college wants to use the existing UTP

cable infrastructure, and there is plenty of UTP

wiring for A/V signals, separate from the phone

and computer network systems (A/V signals must

be run separately from the other types of signals).

For other scenarios, UTP is a less viable

choice. For short cable runs, UTP is a more

complicated and more costly cable to use than

coaxial cable because there is a high initial,

fixed cost. This expense is inevitable because of

the need for UTP transmitters and receivers.

Special transmitter and receivers sets are

required for two reasons:

1) The main reason is signal transmission. A

special type of signal (differential analog) is

used to make the best use of UTP wire despite

its limitations. To transmit video over UTP, a

special transmitter is needed to convert the

video to a differential analog signal that is a

better match for UTP wire. At the receiving

end, a receiver is needed to convert the

differential analog signal back to a usable video

signal.

2) A less significant reason is connectorization.

A/V components typically don’t use the RJ-45

connectors that UTP cable uses.

Also, coaxial cable systems have better

quality and consistency, while being lower-cost,

than UTP cable systems when cable runs are

shorter than 200 ft. (61 m). Coaxial cable is also

more uniform at these shorter distances, since

lengths of wire pairs often vary within the same

UTP cable due to small differences in twist

tension and rates.

UTP Cabling

UTP cabling was originally developed by the

computer industry for transmitting digital data

over computer networks. Using UTP for video is

not simply a matter of soldering BNC

connectors to the wire and then connecting

equipment together. It’s vital to treat your UTP

system as an A/V system.

CAT 5 R AV

Cat 5 Video and Audio

Receiver

Extron’s CAT 5 R AV receives long-distance transmis-

sion of NTSC/PAL composite video with stereo audio.

CAT 5 R BNC A

CAT 5 RGB Video and

Audio Receiver

Extron’s CAT 5 R BNC A receives long-distance trans-

missions of RGB video, component video, S-video, or

composite video with stereo audio.

CAT 5 R BNC AV

CAT 5 RGB Video,

Composite Video and

Audio Receiver

Extron’s CAT 5 R BNC AV combines all of the

functionality and connections of the CAT 5 R BNC

and the CAT 5 R BNC AV into one enclosure.

CAT 5 T 15HD AV

CAT 5 Interface/

Composite Video and

Audio Transmitter

Extron’s CAT 5 T 15HD AV accepts analog computer

video with PC audio as well as NTSC/PAL composite

video with stereo audio.

CAT 5 T AV

CAT 5 Video and Audio

Transmitter

Extron’s CAT 5 T AV accepts NTSC/PAL composite

video with stereo audio.

CAT 5 T BNC DA4

CAT 5 RGB Video

Distribution

Amplifier/Transmitter

Extron’s CAT 5 T BNC DA4 is a one input, four output

distribution amplifier that accepts RGBHV signals.

CAT 5 T BNC

CAT 5 RGB Video

Transmitter

Extron’s CAT 5 T BNC accepts RGBHV, RGBS, RGsB,

component video, S-video, or composite video signals.

Extron’s Product

Line of Twisted Pair

Transmitters &

Receivers

CAT 5 T 15HD A

CAT 5 Interface

Transmitter

Extron’s CAT 5 T 15HD A accepts analog computer

video with PC audio.

Transmitters

1 2 3 4 5 6 7 ... 27 28

Kommentare zu diesen Handbüchern

Keine Kommentare

Sharp LC-28HM2 Spezifikationen Seite 2

Kommentare zu diesen Handbüchern