Video Conferencing

Bandwidth

Craftsmanship, Quality, and Professionalism _

 

Video conferencing is a bandwidth hungry application especially when using high definition video. The following list can be viewed as a general guide for IP bandwidth data rate supported resolution for most common video conferencing systems;

  • 128k (432 x 240) WCIF,

  • 384k (912 x 512) DVD quality,

  • 512k (1088 x 720) twice DVD quality,

  • 768k (1280 x 720) (720P30) high definition at 30 frames per second,

  • 1.1Mb (1280 x 720) (720p60) high definition at 60 frames per second,

  • 1.7Mb (1920 x 1080) (1080P30) full high definition at 30 frames per second,

When establishing IP bandwidth requirements it is generally accepted best practice to allow an additional 20% bandwidth allocation when initiating a video call over IP. As an example; when initiating a video call over IP at 384Kbps the actual bandwidth required is approximately 460Kbps and equally if a video call is initiated at 1Mbps the actual bandwidth required is approximately 1.2Mbps.

Based on our experience it is our recommendation that in order to enjoy a quality video conferencing session at least 1Mb dedicated synchronous bandwidth be available per participating site.

 

512Kbps connectivity will provide the end user with a reasonable video conferencing experience. Typically minor video delay is possible especially on fast movements.

 

As a bare minimum one would use 384Kbps that will provide the end user with a usable but far from perfect video conferencing experience.

 

Cloud based

Infrastructure Solution_

A Cloud Based Infrastructure Solution is in many instances a viable alternative solution when compared to tradition hardware based video conferencing solutions.

Limitations of Cloud Based Solutions include its own unique bandwidth limitations such as bandwidth used in a multi party call and in a multi-protocol label switching (MPLS) or similar setting with a single internet breakout. The internet bandwidth constraint could be limiting and are a primary consideration when proposing a video conferencing solution. 

Before proposing a video conferencing solution AVDI will perform a comprehensive customer need analysis, examine the existing bandwidth infrastructure, explore bandwidth management solutions and or suggest additional bandwidth solutions.

ADSL bandwidth 

for video conferencing_

Bandwidth via ADSL is not suitable for use as connectivity for video conferencing. The reason for this is the fact that ADSL service is asynchronus meaning that the download speed of the service is generally much higher than the upload speed. Video conferencing requires a service that provides a adequate amount of upload speed and synchronus bandwidth.

In addition ADSL service does not provide Quality of Service (QOS) which means that traffic via ADSL can not be managed. Traffic can not be prioritized and no packet labeling is available making for service speed and quality that can not be controlled of guaranteed by the Service Provider. ADSL is also a highly contended service and therefore the specified bandwidth speed and actual bandwidth speed may vary greatly. 

Because ADSL bandwidth contention is unpredictable, the service quality may vary greatly based on the time of day, week, month and geographic location. These variables make ADSL service unsuitable as a video conferencing connectivity backbone.

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