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Multcasting isn’t limited to just video either. You can also use it for both
video and peripheral signal extension and sharing (often called “KVM
extension”) applications. These types of extenders feature keyboard/
mouse emulation and emulation for other standard HID devices, while
providing easy access to single-, dual-, or quad-head computers — ideal
for applications requiring multiple graphic heads to be switched
simultaneously from a single workstation. In command and control room
setups, for example, you can multicast video and data to receivers
attached to LCDs
in video walls. Users can then interact with computers behind the scenes
using separate keyboard, mice, and digital displays.
Education | Distribution Methods
IP-Based Distribution
IP-based distribution technologies use transmitters
and receivers to extend signals over a TCP/IP
network (a LAN or even a WAN, for instance).
Oftentimes, they’re called IP streamers when
used with codecs. But, when choosing one, be
sure you’re not looking at the consumer-grade
devices for streaming video in small office
applications; be sure it’s a professional-grade
multicasting product.
These sophisticated extenders use CATx cabling
infrastructure, but in comparison to standard
non-networked CATx extenders, they multicast data over an active
Ethernet network. They do this by packetizing media streams for delivery
over an IP-based network, so source content can be delivered anywhere
you have Ethernet wiring.
By leveraging existing IP network connections to distribute multimedia
content, businesses can avoid running expensive dedicated links from a
back room to digital signage in lobbies or other public areas. Plus, the video
is a lot less susceptible to interference, image skew, and compromised
resolution.
Compression makes it possible to run the signal over longer runs — and
compression does not have to mean low-quality video. Compressions
may be lossy or lossless. The IP-based extension methods we’re
discussing use visually lossless compression with algorithms that make it
possible to run Full HD video over the LAN without any visual loss in
quality.
They may even simulcast video and audio synchronously so there’s no
latency, feature QoS prioritization and bandwidth-management controls,
and the ability to use bidirectional (two-way) serial signals to query a
remote display to, for example, shut it down and power it on or gather
performance data. What’s more, the system you choose may even
support bidirectional serial connections for use with interactive
touchscreens.
Also, they may or may not support existing networking standards.
This is important if you need extra distance in your distribution
application. If they do support Ethernet standards, you can extend video
through networking switches to get extra-long distances, beyond the
specified cabling distances of 328 feet (100 m) per the Ethernet standard.
Because IP-based extenders are based on standardized Ethernet
protocols, you can even use media converters and run several miles over
fiber cabling. Plus, these extenders transmit signals digitally from end to
end, so digital content is never compromised.
Meeting existing standards also allows for easy installation and
expansion. Simply plug in as many receivers as you need for your remote
screens and use a standard Gigabit network switch with IGMP snooping
to control the traffic. IGMP is very important in multicasting. This stops
an IP switch from passing on multicast data onto every port and prevents
performance degradation and wasted network bandwidth. Switches
with IGMP support “know” which devices on your IP network want to
receive the multicast packet and who doesn’t. Otherwise, the traffic may
be broadcasted to every end device on your network, slowing it to a halt.
100%
Picture Quality
Cable Length
Picture quality of an analog
signal gradually declines over
longer lengths of cable.
Picture quality of an digital
signal (e.g. HDMI) suddenly
drops at a certain length of
cable (cliff effect).
100%
Picture Quality
Cable Length
to ask.
QUESTI
NS
Contact the experts at 0811/5541-110.
1. How far do you need to transmit your video?
Do you want to go farther than 100 Meter?
2. Do you have copper (CATx or coax) wiring not in use?
3. How important is video quality? Do you intend to
transmit medical images or detailed graphics
renderings?
4. Is bandwidth an issue on your network? Is your LAN
already being used for VoIP or data-intensive
applications?
5. Do you want to transmit to one screen or multiple
screens?
6. Will you need connectivity to serial touchscreens?
7. Is data privacy an important consideration?
8. Will you be distributing video near machinery?
9. Do your network switches support IGMP snooping?
10. Do you need peripheral support (for instance, for
remote users who require keyboard and mouse control,
or for command and control room applications)?
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Multicast Transmitter
HDMI Cable
CATx Cable
IP LAN
Layer 3 Switch
with IGMP
Digital Displays
HDMI Cables
CATx Cables
CATx Cables
Multicast Receivers
Layer 3 Switch
with IGMP
Digital Signage
Appliance
Multicast Transmitter
CATx Cable
PC