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Source Devices

Digital signage publishers

Also called digital signage appliances, these function essentially as storage

devices to play back digital content, such as MPEG or Windows

AVI media,

Flash

animations, PowerPoint

movie files, and audio. They can operate on

their own (directly connected to a screen), but are usually on a network with

their own IP address, enabling management via a browser-based interface.

They can also be set up to deliver RSS and XML data feeds, and other

Web-based content in real time to your displays. They’re usually Windows

or Linux

based PCs by design with spacious drives and high-performance

processors. They’re called publishers because they contain the software

that enables you to manage content distribution, as well as creative design

tools to set up and insert media into zones within a signage presentation.

Other video sources

This can be as simple as a Blu-ray or DVD player, or a robust dedicated or

shared server hosted centrally or in a distributed environment.

These devices can also be used to bridge the connection between your

digital signage publisher and a content management system. For instance,

prerecorded video and other content can originate from the content

management system or a video library. For corporate applications, your

AV distribution system can be connected to an Oracle

database or a

CRM system, and in retail applications, digital signage screens can link

to a PoS database running on a network and tracking available inventory.

Source devices can also be whatever it takes to link a Internet or WAN

feed to your video distribution or digital signage system, including network

gateways or CATV or DTV set-top boxes.

Extenders

For maximum reach and image control in your AV distribution or signage

application, you’ll likely need devices that enable you to send signals farther

than what’s possible when using video cabling by itself. These transmitter/

receiver combos enable you to send DVI, VGA, or other types of video (as

well as audio) from a PC or other source devices to remote screens.

These devices include:

• In-line extenders, like amplifiers and boosters, which are installed

within a video cable run.

• Baluns, which are devices that connect a balanced line, such as

twisted-pair cable, to an

unbalanced l

ine, such as coaxial cable.

Many versions are available for VGA and other analog RGB video

standards, as well as CCTV camera connections.

• CATx-based extenders, which convert the signal for extension

over CAT5 or higher-grade cable, enabling you to use inexpensive

wiring for your long-distance extensions.

• Fiber-based extenders (or transceivers), which convert and distribute

AV signals over interference-free fiber cabling at very long distances.

• Broadcasters, which are like extenders in that they typically use CATx

cabling to distribute video to remote locations. However, they also

support multiple channels for multisite distribution.

• QAM modulators. These encode and modulate video input and create

an HDTV channel for low-cost video distribution over existing RF

cabling. Simply use the QAM tuner of an HDTV to receive the channel.

• IP-based streamers and encoders/decoders. These devices compress

and encode source video for extending over a LAN using lossless

compression technology. They can be for multipoint distribution

(multicast) or point to point (unicast).

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