As visual collaboration announcements about new products continue to hit the news it can be somewhat challenging to discern the technical jargon from the user benefit. Nearly all of these announcements refer back to some set of technical terms that may be lauded in the announcement but aren’t fully explained. Below are some key terms and meanings that you might have seen recently.
SVC – Scalable Video Coding:
Up until now most major video conferencing manufacturers have built their solutions around AVC (Advanced Video Coding). Essentially AVC and SVC are formats of compression technology that allow high definition video to be sent across networks in an efficient manner. AVC essentially sends video at a one resolution, one frame rate with one level of quality across a network. The weakness with this approach is when there are network issues; quality suffers because the stream is unable to adapt down to different resolutions or frame rates.
Conversely, SVC sends multiple layers and resolutions, while monitoring the network. When problems arise, SVC can essentially peel back layer by layer, adapting to the network environment. The result is smoother video that provides a superior user experience.
1080p30 vs. 1080p60
720 and 1080 refer to the lines of resolution of a high definition video single. If you own a HDTV at home you are generally watching 720 or 1080 content on your screen, usually at 30 frames per second. Essentially the human eye is interpreting 30 images a second to create the motion of the content on TV. Now video conferencing systems are starting to use 60 frames a second; the result is a more lifelike, fluid motion. As these frame rates go up, along with the resolution, the image becomes closer to reality.
The “holy grail” of video conferencing has been the ability to easily connect to and communicate with vendors, partners, and suppliers. Many of the roadblocks for this type of communication have been technological; either due to interoperability or network issues. The term B2B in the visual collaboration world refers to this type of cross organization connections.
Delivering video conferencing signals across networks requires a number of elements to be successful. The H.323 protocol is design to be a standard that video conferencing manufacturers use which allows their systems to speak the same language. H.323 controls the audio and video signals, the bandwidth, and call control (alerting you to incoming calls, providing alerts, etc). Major manufacturers such as Polycom, Cisco, and Lifesize offer H.323 systems that can easily communicate with each other.
Like H.323, SIP is a protocol design to enable the communication and connection of devices across networks. SIP is an older protocol that was designed more for closed systems that would ultimately connect via gateways to other closed systems. Additionally, it is not as robust for adding new features.