broadcast technology trends and insights 2015
Caton Technology brings live and files
transmission over open Internet solution
BY CHANDLER WANG
When it comes to live video
transmission over open Internet,
there are three most significant
challenges for conventional
transport protocol (UDP, TCP,
and TCP-based protocols such
as RTMP, HTTP and FTP), which
are the primary reasons of QoS
problem for video contribution
over public network.
n Bandwidth: The bandwidth
of uplink (first mile) and
downlink (last mile) is usually not
guaranteed in a typical Internet
scenario. The traffic congestion
can occur at any nodes between
source and destination, which
significantly decreases the
Bandwidth Utility Ratio (BUR).
For data transfer without time
limitation, the transmission rate
can be decreased to guarantee
the quality, but it is not workable
for real-time video, as lower bit
rate means lower quality.
n Jitter: Jitter is a normal
phenomenon caused by network
block-up and buffering in routes.
Differing from non-real-time
data, jitter will cause flaws on
decoded pictures and sounds for
a live network playing.
n Packet loss: Data packet
error or lost will break the video
quality. UDP cannot handle the
case by itself, although it utilises
the bandwidth effectively. TCP
can improve byte level correction
but its BUR is poor; buffering
causes higher latency and also
higher jitter.
QoS problem for live video
transmission over open Internet
Video Delivery Network (VDN) based on R2TP transport technology
is a composite of bandwidth
available, quality, latency and
jitter. In most cases, solution
cannot be found to cover
all the factors. However, the
market’s need for a flexible, next-
generation live video and file
transfer technology is pervasive
and exploding as data sizes
increase, network capacities
grow, and users increasingly
exchange data and media.
R2TP
Reliable Real time Transport
Protocol (R2TP) is an IP-based
transport protocol designed to
solve the QoS/QoE problems
for live video transmission over
Internet. A proprietary protocol
owned by Caton Technology at
patent pending, R2TP applies
several innovative mechanisms to
overcome the shortcomings of
conventional TCP-based protocol
and guarantee the transport
bandwidth for broadcast video
R2TP provides a guaranteed transmission bandwidth regardless of
public network conditions
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contribution regardless of different
public network condition.
A creative congestion control
technique is used to avoid the
flaws caused by TCP and TCP-like
protocols. R2TP maximises the
BUR, allowing users to deliver
higher quality content in a given
bandwidth.
R2TP invents high-effective
error recovery mechanism, and
improves stability and reliability
by implementing a clock
synchronisation-based ARQ
method to make error recovery
mechanism more effective. With
its algorithm-based packets gap
and network parameters, the R2TP
can detect packet loss at the first
time, even in a continuous packet
loss scenario. In addition, the BUR
of R2TP is distance-independent
and will remain at a stable value,
even if RTT increases sharply.
In some scenarios, customers
may have multiple network links
available, but none that meets the
video streaming or bandwidth
requirements. R2TP implements
a dynamic multi-path bounding
method to satisfy those demands.
By implementing an intelligent
network load-balancing strategy,
R2TP bounds multiple links into a
virtual link, and balances the data
traffic of each link dynamically,
depending on the network
conditions.
F2TP
With the great progress of live
video transmission over R2TP
technology, Caton Technology has
also applied this core technology
to the file transfer field as Fast
File Transport Protocol (F2TP).
F2TP fully utilises the available
network bandwidth, moving file-
based data at maximum speed,
regardless of network conditions,
transfer distance and data sizes.
This core transport
technology can be deployed in a
wide range of applications, from
high bitrate live broadcast video
contribution and distribution to
broadcast newsgathering and
coverage. It is also applicable for
video conference, e-learning and
event-based live content delivery
platform.
MISSION POSSIBLE
Caton’s mission is to create the
next-generation Video Delivery
Network (VDN), providing cloud
service for video distribution and
fast file delivery, and also the
upcoming 4K OTT solution.
With the increasing trend on
Internet usage, the global broad
band and Internet bandwidth
has been enhanced. Caton’s
R2TP acts as a viable solution
for live video and file-based data
delivery over the open Internet.
This reliable real-time transport
protocol offers substantial cost
saving and presents a great
alternative for the common video
contribution and distribution
solution over satellite or dedi-
cated lease line, which involves a
relatively high cost of implemen-
tation.
For more information,
please contact
sales.asia@
catontechnology.com
Chandler Wang is CTO
of Caton Technology.
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