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description
IP Based Video IP Based Video ConferencingConferencing
By Tom PetersenBy Tom Petersen
May 3 2007May 3 2007
IntroductionIntroduction
HistoryHistory
ComponentsComponents
How it WorksHow it Works
BenefitsBenefits
CostCost
ProblemsProblems
Common QuestionsCommon Questions
HistoryHistory
Started in the 90’sStarted in the 90’s
Done over ISDN linesDone over ISDN lines
Very expensiveVery expensive
H.320 protocols were used H.320 protocols were used
ProtocolsProtocols
SIP Session Initiation Protocol SIP Session Initiation Protocol Internet based application that uses TCP, Internet based application that uses TCP,
UDP and others UDP and others User agents can be telephones, video units, User agents can be telephones, video units,
PDA’s and more PDA’s and more
H.323 H.323 A family of protocols that is made up of many A family of protocols that is made up of many
different protocols different protocols
Protocols cont.Protocols cont.
The most important protocols in this family are The most important protocols in this family are H.225 and H.245 which are both in the transport H.225 and H.245 which are both in the transport layer. H.225 performs call control while H.245 layer. H.225 performs call control while H.245 performs call management performs call management
Table1: taken from: howstuffworks.com
ComponentsComponents
Camera Camera
Video Display Video Display
Audio Components Audio Components
Codec Codec
User Interface User Interface
How it WorksHow it Works
Quality of Service (QoS) Quality of Service (QoS) Manages data traffic Manages data traffic Makes sure that the quality of the IP video Makes sure that the quality of the IP video
transmission is good transmission is good It does this by setting aside an amount of It does this by setting aside an amount of
bandwidth for video calls and doesn’t allow bandwidth for video calls and doesn’t allow other traffic to use it other traffic to use it
How it Works cont.How it Works cont.
GatekeeperGatekeeper Software that allows you to register all the Software that allows you to register all the
users that you might want to contact for a users that you might want to contact for a video conference video conference
Makes it easy for people that aren’t experts in Makes it easy for people that aren’t experts in computers computers
Can connect to Conference Room 1 or the Can connect to Conference Room 1 or the phone number to that room instead of the IP phone number to that room instead of the IP address of the computer in that roomaddress of the computer in that room
Can limit bandwidth for specific users Can limit bandwidth for specific users
BenefitsBenefits
Quality and Technical Advantages Quality and Technical Advantages Some of the things that effect video quality are Some of the things that effect video quality are
bandwidth, frame rate, resolution, picture size, and bandwidth, frame rate, resolution, picture size, and codec’s used codec’s used
Ease of UseEase of Use ISDN is difficult to understand ISDN is difficult to understand Need a special technician to fix a lot of the Need a special technician to fix a lot of the
problems problems IP based can be used by just about anyone with IP based can be used by just about anyone with
little training little training
Benefits cont.Benefits cont.
The amount of people that already use itThe amount of people that already use it ISDN was never available in every geographic ISDN was never available in every geographic
region and the regions that did have it only region and the regions that did have it only had it in specific conference rooms had it in specific conference rooms
IP based is available just about everywhere IP based is available just about everywhere and can be installed on any computer not just and can be installed on any computer not just in meeting rooms in meeting rooms
Benefits cont.Benefits cont.
Cuts down on travel cost Cuts down on travel cost Don’t have to spend money flying employees Don’t have to spend money flying employees
to meetings, pay for hotels and food while to meetings, pay for hotels and food while they are away they are away
Allows the employee to be more Allows the employee to be more productiveproductive They don’t have to spend half a day traveling, They don’t have to spend half a day traveling,
they can use that time to get work done they can use that time to get work done
CostCost
The biggest benefit to IP video The biggest benefit to IP video conferencing is costconferencing is cost
Cost can be split up into two main Cost can be split up into two main categoriescategories Initial set upInitial set up Monthly FeeMonthly Fee
Initial Set UpInitial Set Up
Initial setup includes buying all the Initial setup includes buying all the equipment needed for video conferencing equipment needed for video conferencing
There are two different ways you can go There are two different ways you can go when buying equipment depending on when buying equipment depending on your needsyour needs You can buy an all in one unit You can buy an all in one unit You can buy all the parts separately You can buy all the parts separately
Initial Set UpInitial Set Up
All in one unitsAll in one units
View stationView station
Buying parts separatelyBuying parts separately
Good if you already have some parts and Good if you already have some parts and only need a few othersonly need a few others
Good if you have a specific set up in mind Good if you have a specific set up in mind and what to pick out your own partsand what to pick out your own parts
Initial Set UpInitial Set Up
Figure 1: done with Visio some pictures taken from polycom.com
Monthly FeeMonthly Fee
The price can depend on many different The price can depend on many different things including, bandwidth and how much things including, bandwidth and how much you use it you use it
Price can range anywhere from free to Price can range anywhere from free to $1,000 a month depending on the type of $1,000 a month depending on the type of service you wantservice you want
Monthly FeeMonthly Fee
No monthly Fee ServicesNo monthly Fee Services Windows Live, Skype, AIMWindows Live, Skype, AIM
Monthly Fees ServicesMonthly Fees Services GlowpointGlowpoint
Monthly FeeMonthly Fee
Figure2: Monthly charges for using IP instead of ISDN Taken from:glowpoint.com
ProblemsProblems
You can’t have eye contact with the You can’t have eye contact with the person you are speaking to person you are speaking to
Some people don’t like to be on camera Some people don’t like to be on camera
The biggest problem with IP based video The biggest problem with IP based video conferencing is bandwidth problems conferencing is bandwidth problems
Fixing Bandwidth ProblemsFixing Bandwidth Problems
Multi-cast Multi-cast Multi-cast allows multiple endpoints to receive Multi-cast allows multiple endpoints to receive
data at the same time with about the same data at the same time with about the same overhead as sending the data to a single overhead as sending the data to a single endpoint endpoint
Real-time Real-time Guarantees that packets are delivered in a Guarantees that packets are delivered in a
timely manner timely manner
Common QuestionsCommon Questions
How many users can be linked together How many users can be linked together in a conference call?in a conference call? Multipoint Control Unit (MCU)Multipoint Control Unit (MCU)
Shows you who is talking Shows you who is talking
Grid with all the endpoints on it at once Grid with all the endpoints on it at once All the users don’t have to have the same All the users don’t have to have the same
setup either setup either
QuestionsQuestions
Do all users have to support video on Do all users have to support video on the conference call?the conference call? No you can connect with just audioNo you can connect with just audio This allows meeting rooms to connect with This allows meeting rooms to connect with
video and people that can’t get to the video and people that can’t get to the meeting can connect with audiomeeting can connect with audio
Audio users can still see the videoAudio users can still see the video Can even connect with a cell phoneCan even connect with a cell phone
QuestionsQuestions
Can you connect IP based video Can you connect IP based video conferencing with ISDN?conferencing with ISDN? Yes, but there are fees that are not Yes, but there are fees that are not
included in the monthly feeincluded in the monthly fee The fees are a lot cheaper than if you were The fees are a lot cheaper than if you were
connecting ISDN to another ISDN systemconnecting ISDN to another ISDN system
IP to ISDN Connection FeeIP to ISDN Connection Fee
Table 2: Taken from:glowpoint.com
ReferencesReferences[1] Edward A. Garay, “Videoconferencing over the Internet” [1] Edward A. Garay, “Videoconferencing over the Internet” http://www.uic.edu/depts/accc/itl/pubs/ipvc/index.html Accessed March 25, 2007. Last updated http://www.uic.edu/depts/accc/itl/pubs/ipvc/index.html Accessed March 25, 2007. Last updated March 21, 2001.March 21, 2001.[2] Indiana Higher Education Telecommunications System. “How does IP video conferencing [2] Indiana Higher Education Telecommunications System. “How does IP video conferencing work?” http://www.ihets.org/progserv/dms/videoconferencing/tutorials/instructors/02_how.html work?” http://www.ihets.org/progserv/dms/videoconferencing/tutorials/instructors/02_how.html Accessed March 26, 2007. Last updated September 01, 2006.Accessed March 26, 2007. Last updated September 01, 2006.[3] Hitachi Software Engineering Technology Solutions Group, “Why IP-based [3] Hitachi Software Engineering Technology Solutions Group, “Why IP-based Videoconferencing” http://www.hitachi-soft.com/tsg/solutions/video/ipbased.html Accessed March Videoconferencing” http://www.hitachi-soft.com/tsg/solutions/video/ipbased.html Accessed March 12, 2007. Last updated 2007.12, 2007. Last updated 2007.[4]Techphonic Corporation, http://www.techphonic.com/html/faq.html#1 Accessed April 1, 2007. [4]Techphonic Corporation, http://www.techphonic.com/html/faq.html#1 Accessed April 1, 2007. Last updated 2006.Last updated 2006.[5] Ford, Steve, “Video Conferencing” http://www.objs.com/survey/vc.htm Accessed April 1, 2007. [5] Ford, Steve, “Video Conferencing” http://www.objs.com/survey/vc.htm Accessed April 1, 2007. Last updated April 22, 1996. Last updated April 22, 1996.[6]Saqib Jang, “A Technical FAQ Frequently Asked Questions About Voice and Video over IP [6]Saqib Jang, “A Technical FAQ Frequently Asked Questions About Voice and Video over IP Networks” http://www.wainhouse.com/files/papers/wr-faq-ip-conf.pdf Accessed April 2, 2007. Networks” http://www.wainhouse.com/files/papers/wr-faq-ip-conf.pdf Accessed April 2, 2007. Last updated January, 2003.Last updated January, 2003.[7]GlowPoint, Glowpoint.com Accessed March 12 2007. Last updated 2007.[7]GlowPoint, Glowpoint.com Accessed March 12 2007. Last updated 2007.[8]Polycom, Polycom.com Accessed April 1 2007. Last updated 2007.[8]Polycom, Polycom.com Accessed April 1 2007. Last updated 2007.[9]Wikipedia, “Video conferencing” [9]Wikipedia, “Video conferencing” http://http://en.wikipedia.org/wiki/Video_conferencingen.wikipedia.org/wiki/Video_conferencing Accessed Accessed April 1 2007. Last updated February 2007.April 1 2007. Last updated February 2007.