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Videoconferencing Technical Considerations for IT ProfessionalsClarkPowell
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2. Agenda
What is VC and Why ?
Components & Ecosystem of VCS
Main Players of VC
Basic Product Terminology
3. What is Video Conferencing System(VCS)?
Communicatio
n Network
New York Beijing
Three elements of VC
• Different locations(Branches)
• Communication Network
• Acquisition and Restoration of Audio&Video
VCS:Video Conferencing
System
Name:Video Conferencing System
Also:TV Phone Conferencing System
Definition:A video conference offer live, visual connection
between two or more people residing in different locations for the
purpose of images, text, video and audio communication.
4. Why VCS?
Low High
HighLow
Communication Effect
Response
Time
The purpose of all communication:
Improve efficiency, Save cost
VCS Benefits
Reduce commercial cost
Faster Communication
More convenient information sharing
Improve business efficiency, increase
competitiveness
5. VCS Uses
Business Management
Operating Decision
Financial Management
CRM
SCM
Stock Management
Office Automation
Publicity
Business Training
Aftersales Training
Aftersales Support
Remote Business
Remote Negotiation
Remote Recruitment
Remote Communication
Others…
Administrative Conference
Remote Court
Remote Education
Remote Medical Treatment
Remote Finance
Emergency Communication
Remote production scheduling
Government Office Informatization
★ Applicable to various group activities in various fields!
Internal:Administrative conferences/collaborations between branches
External:Communicate with customer/partner/supplier etc.
11. Endpoint
Multi-codec Endpoints with built-in MCU
Single-codec Endpoints
Immersive Telepresence Telepresence product,the top end
Desktop Desktop all-in-one/VP/PC software
Mobile Android/iOS App
Infrastructure
(Different Servers)
MCU
Independent MCU product for large scale
conference for mixing the videos from all
participants
Gatekeeper
Gatekeeper, like SIP Server
used for H.323 register and calling routing
NAT Transversal Used for branches firewall traversal
Manager Meeting management, Devices management
Introduction of VCS Components
13. VC Classification
Hardware VCS Software VCS Cloud VCS
Advantage Disadvantage
Hardware VCS Great experience, stable Expensive, poor expansibility
Software VCS Cheap Poor experience, unstable
Cloud VCS
Charge by service, less investment at first time
Low maintenance cost
Good expansibility
Highly rely on SP network condition
Security concerns
Many uncontrollable factors, no safe
sense
16. Cisco
Cisco 2009 purchased Tandberg with 3.4 B $;
Polycom
In 1998,Polycom purchased ViaVideo
In 2003,ViaVideo ex-owner established Lifesize
In 2009,Logitech purchased Lifesize with 40.5 M $
In 2011, Polycom purchased HP Halo Telepresence system
Radvision
In 2012,Avaya purchased Radvision with 10 M $
Vidyo Boss comes from Radvision
Others
In 2013,Clearone purchased VCON to enter VCS market
History of VCS main players
17. VCS Other Players
Hardware VCS Polycom, Cisco, Lifesize, Radvision, Aver, ClearOne
Software VCS Pexip, Mind…
Cloud VCS Service Provider Lifesize, Bluejeans, Vidtel, Zoom..
Web VCS Service Provider WebEx
21. Camera
• 1080p Full HD
– Camera can acquire 1080p@30 fps full HD image
• PTZ
– Short for Pan/Tilt/Zoom.
• Viewing angle
– The range which camera can cover, viewing angle of Yealink is 70°~ 83°
*The viewing angle of competitor is (70 ° - 80 ° )
22. Camera - Zoom
• Optical Zoom
– Zoom include optical zoom and digital zoom.
– Optical Zoom: Optical zoom changes the magnification of images with the actual optical
glass before the image reach the imaging sensor. The optical zoom ratio of a digital camera
measures how much the lens can actually zoom in to make subjects appear closer.
– Digital Zoom: Digital zoom is a part of digital cameras, and camcorders, which helps to crop
the entire image, and then digitally enlarge the size of the viewfinder of the portion that is
needed to zoom in on.
*Yealink 12X
Aver 16X
Cisco 4-14X,high-end product with 20X
Lifesize 10X
Polycom 12X
23. Resolution
Resolution:
The number of pixels on each individual line, its measuring unit is pixels/inch(ppi). For an
image with 1024×768 means there are 1024 pixels on each line with 768 lines in total .
24. Frame Rate
Frame rate:
Used to measure the number of frames per second. The measuring unit is Frames per Second,
short in FPS or Hz. Current mainstream is 30fps,the future trend is 60fps
Film:24fps
TV(PAL):25fps
TV(NTSC):29.97fps
CRT Monitor:60Hz-85Hz
LCD Monitor:60Hz
3D Monitor: 120Hz
25. • Frame rate:
The number of images transported per second
• Common frame rate
– 15f/S (image “jump”)
– 25f/S(image is fluent and matches with domestic light frequency)
– 30f/S( image is fluent )
– 60f/S(improve interaction and realistic sense obviously)
– Higher frame rate brings higher fluency
• Common frame rate + resolution
– 1080p 30fps
– 720p 30fps
– 720p 60fps
Frame rate
26. • High Resolution Camera
• High Resolution CODEC
• High Quality Network[660Kbps+]
• High Resolution Monitor
– The image resolution should be 720p above
Four elements of HD VC
28. Synchronization of Audio & Video
Image input/output
devices
Audio input/output
devices
Image Encoding
Audio
Encoding
Delay
Synchronization
of audio & video
*The data amount of audio smaller, the process speed is faster, so it is needed to
synchronize the audio and video.
30. Omnidirectional/Directional microphone
• Omnidirectional Microphone: pick up voice by 360 degree
• Directional Microphone: pick up voice in particular direction
Omnidirectional Microphone Directional Microphone
OK OK
OK
OK
NG
32. Dual-Stream(H.239, BFCP)
• Dual-Stream:
Dual-video transfer technology, which allows to deliver two media
streams(camera video and content sharing) in a video conference. The two
media streams share uplink bandwidth.
• Content Sharing:
The content stream(document ,video) sent from sending endpoint like PC
33. P+C:
People + Content (layout cannot be changed).
Mix video and content into one video which only occupies
one call bandwidth.
Mixed Stream
34. Dual-Display
• Dual-display:
Connected with two display devices, one for local image, the other for remote
image, or one for people image, the other for content sharing, which provide
better video conference experience and improve efficiency.
35. Dual Input,Dual Output
• Dual video input:
PC(HDMI or Mini-DP)content sharing input, Camera(DVI)people image input.
• Dual video output:
with two HDMI interface, which can connected with two display devices to realize dual-
display.
36. Layout
• Layout:
Layout for all the images (Local image, remote image, content sharing, etc.):
Full Screen, Equal, OneplusN and so on
39. Protocol
Framework
H .320 H.323 SIP
network ISDN IP network IP network
Advantage
Connection-oriented
Stable speed and delay
Small time delay, low error
rate
Guaranteed
communication quality
Flexible connection high
utilization of bandwidth
Good expansibility
High cost performance
Strong compatibility
Flexible connection high
utilization of bandwidth
Good expansibility
High cost performance
Compatible with IMS,UC
Weakness
Permanent connection
Low utilization of
bandwidth
Poor openness
High cost for single device
and lines
Easily affected by the
network
Needs QoS or Package
lost recovery
Easily affected by the
network
Needs QoS or Package lost
recovery
Yealink Out of date Supported Supported
Mainstream Protocol Comparison
42. Package Loss Reason
Package Loss Reason
Main reason is network congestion
Network devices faulty:the problem caused by the switch faulty,
network cable loose, etc., which should be solved by client’s network
administrator instead of us.
43. Solution for Package Lost
Solutions(3 ways)
1. Package loss prevention
2. Package loss Recovery
3. Package loss avoid
44. Dynamic bandwidth adaptability
• 30% video package loss resistance
• Higher priority for content sharing and audio: Ensure the bandwidth the content
sharing and audio in priority
• Calling bandwidth adaptability, protocol adaptability, video & audio adaptability
Network Adaptability