gathering of state networks february 6, 2002 ip video issues
TRANSCRIPT
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Gathering of State NetworksFebruary 6, 2002
IP VIDEO ISSUES
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IP VIDEO ISSUES AGENDA
BACKGROUND QUALITY OF SERVICE (QoS)CODECSGATEKEEPERS/GATEWAYSDIAL PLAN DIRECTORY SERVICES
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BACKGROUND
TWO-WAY INTERACTIVE VIDEO– ATM VIDEO (H.321) 1998
– ISSUES• COST OF END POINT EQUIPMENT
• DESKTOP EQUIPMENT COST
• CURRENTLY – 165 ENDPOINTS ON NETWORK
• FOR CONVERGED NETWORKS ONLY GAME IN TOWN
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BACKGROUND
H.323 – IP VIDEO 1999– PRODUCTS AVAILABLE– IP ACCESS ALREADY IN PLACE– COSTS OF ENDPOINTS MUCH CHEAPER– MORE DESKTOP SOLUTIONS
AVAILABLE
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ISDN
Workstation
Workstation
Workstation
H.323 VideoTerminal
H.320 VideoTerminal
H.321 VideoTerminal
BRI, PRIor V.35
IOS BasedGatekeeper/Proxy MCU's
VideoGateway
Courtesy Cisco Systems, Inc.
VideoInfrastructure
GG
ITNNETWORK
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BACKGROUND
MCU TESTING – FALL 1999– Accord , Ezenia, Radvision
• Operability issues
• Performance
– CONCLUSION: TECHNOLOGY TOO IMMATURE FOR A RELIABLE PRODUCTION IMPLEMENTATION
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BACKGROUND
H.323 – IP VIDEO 2001– MCU TESTING – FALL 2000
RESULT: THEY ACTUALLY WORK!!
– RECOMMENDATION: Accord MGC 100
NEED TO LOOK AT THE VARIOUS ISSUES AND COMPONENTS NEEDED TO IMPLEMENT H.323 ON THE NETWORK – IP VIDEO TASK FORCE
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ISDN
Workstation
Workstation
Workstation
H.323 VideoTerminal
H.320 VideoTerminal
H.321 VideoTerminal
BRI, PRIor V.35
IOS BasedGatekeeper/Proxy MCU's
VideoGateway
Courtesy Cisco Systems, Inc.
VideoInfrastructure
ITNNETWORK
GG
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QoS (Quality of Service)
What is QoS– Set of techniques to manage network resources
in a manner which enables the network to differentiate traffic based on policy
Why implement QoS– Provide reliable and guaranteed delivery of
service to users– Bandwidth is not the complete solution
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Quality of Service
Challenges providing QoS for IP video– Head of line blocking (HOLB)– IP video uses UDP (universal datagram
protocol) for transport of video and only
uses TCP for control data – can’t resend lost video packets
– Video uses large, variable length packets
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Video Conferencing Traffic Packet Size Breakdown
37%1025-1518 Bytes
20%513-1024 Bytes
34%129-256 Bytes
1%65-128 Bytes
8%257-512 Bytes
384 kbps Video Call
Courtesy Cisco Systems Inc.
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Video Data Rate + 20% = Bandwidth RequiredVideo Data Rate + 20% = Bandwidth Required
128kbps = 153kbps
384kbps = 460kbps
512kbps = 614kbps
768kbps = 921kbps
1.5Mbps = 1.8Mbps
Video Voice Data Routingetc.
Video Data RateBW Required
Provisioning
< 33% of Link Capacity< 33% of Link Capacity
< 75% of Link Capacity
Link CapacityLink Capacity
“Recommendations”
Courtesy Cisco Systems Inc.
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CODECs
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ISDN
Workstation
Workstation
Workstation
H.323 VideoTerminal
H.320 VideoTerminal
H.321 VideoTerminal
BRI, PRIor V.35
IOS BasedGatekeeper/Proxy
MCU's
VideoGateway
Courtesy Cisco Systems, Inc.
VideoInfrastructure
ITNNETWORK
GG
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Requirements
That a vendor have both a desktop (PC based) and a room system in their product line
Support interoperabilityEase of SupportFinancial considerations
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What We Looked At
Cameras (Fixed and Pan/Tilt/Zoom)Appliance basedPC basedEase of installationEase of configurationChair ControlFar end camera controlMCU capabilityQoS
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Types of Codecs Tested
Room Systems– Polycom– VCON– VTEL– Tandberg
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Types of Codecs Tested cont’d
Desktop Systems (PC Based)– Polycom– VCON
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Recommendations
Room Systems– Polycom Viewstation FX (Appliance Based)– VCON Media Connect 8000 (PC Based)
Desktop Systems (PC Based)– Polycom ViaVideo– VCON ViGO, Crusier & Escort
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GATEKEEPERS
The Brains of an H.323 System
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ISDN
Workstation
Workstation
Workstation
H.323 VideoTerminal
H.320 VideoTerminal
H.321 VideoTerminal
BRI, PRIor V.35
IOS BasedGatekeeper/Proxy MCU's
VideoGateway
Courtesy Cisco Systems, Inc.
VideoInfrastructure
GG
ITNNETWORK
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Difference between Gatekeepers and Gateways
Gatekeeper– IP based
– Address Resolution – Layer 3
– Bandwidth Management• Call Admission Control
(CAC)
– Call forwarding
– Technology Prefixes
– Exist in hierarchies
Gateway– Can transcode
between ISDN, ATM and IP
– Address Resolution – Layer 2
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Limitations of Gatekeepers
4 Levels of HierarchiesCan have no more than 6 Forwarded
Location Requests (LRQ)
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IP Video Gatekeeper Hierarchy
Institutional Gatekeepers– 2 levels of hierarchy
Zone = Area Code Gatekeepers placed at current network
nodesITN Directory Gatekeeper
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DIAL PLAN
To DID or Not to DID?
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Why Do We Need A Dial Plan?
To support legacy ISDN and ATM codecsTo enable a seamless connection between
codecs in various parts of the state.To let people off net to be able to call IP
codecs on net (Inbound calls)USER FRIENDLY
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ITN Dial Plan
E[*T]ZZZNNNNNNN
E = Exit Zone Prefix. “1”*T = Technology Prefix (Optional)ZZZ = Area CodeNNNNNNN = Seven digit E.164 number
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Technology Prefixes
Used for making off net calls to ISDN codecs
*9 – Single channel voice only call*6 – 6-B 64 KB ISDN call or 384 kbps*2 – 2-B 64 KB ISDN call or 128 kbps*3 – 2-B 64 KB ISDN restricted to 56 KB
call or 112 kbps
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Muncie
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ISDN
Workstation
Workstation
Client(IP)
Client(IP)
Gatekeeper
Accord MCUIP
ISDNATM
48 Ports
Ezenia MCUISDNATM
32 Ports
RadvisionGatew ay
Radvision3510MCU
317317317
xxx-xxxxxxx-xxxxxxx-xxxx
Gatekeeper
Gatekeeper
Gatekeeper
PRI Circuit 107
PRI Circuit 108
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TechnologyTopology
1. Current PRI circuit 107and 108. This cirucithandles incoming andoutgoing ATM - ISDN.
2. Circuit 105 and 106 tobe reassigned fromMultilink to Accord.
4. Additional PRI to beprovisioned for InboundISDN - IP. This allows forthree simotaneous point topoint calls.
3. Multipoint conferencesthat include ISDN will berouted to the Accordbridge.
IHETS MainDirectory GK
ClusterCircuit 107 & 108
Circuit 105 & 106New Circuit to beprovisioned
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Common Failures of Video Calls Within the ITN Network
Unit has not been rebooted for several daysPC NIC is not set for 100 Mbps – Full DuplexLAN is not set for 100 Mbps – Full DuplexVideo call is not set up through a gatekeeperGatekeeper not properly configuredWAN is not set for 100 Mbps – Full Duplex
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Common Failures of Video Calls Outside the ITN Network
ISDN Cloud Internet CloudWAN is not set for 100 Mbps – Full DuplexGatekeeper not properly configuredVideo call is not set up through a gatekeeperLAN is not set for 100 Mbps – Full DuplexPC NIC is not set for 100 Mbps – Full DuplexUnit has not been rebooted for several daysLAN is not set for 100 Mbps – Full Duplex
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Directory Services
How Do I Find You
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Two types of Directories
Lightweight Directory Access Protocol - LDAP
Click To Meet
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LDAP
Contains information on endpointsRuns on Unix platformCan connect to a global directory serviceDoes not connect to gatekeepersWill interact with First Virtual
Communications Click To Meet in future versions
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Click To Meet - CTM
Designed specifically for multimedia applications
Works with VTEL, TANDBERG, VCON, POLYCOM, PICTURETEL and ACCORD
Works with ISDN, ATM and IP protocolsCan schedule calls in advanceT.120 application sharing and whiteboards
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CTM – Cont’d
Continuous presence built inWill handle streaming mediaSupports firewall NAT/proxy/VPN
transversalConnects to a gatekeeperSupport for Active Directory December
2001Subsequent versions will have native
LDAP support
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Dialing Made Simple
Courtesy First Virtual Communications, Inc.
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Scheduling Made Simple
Courtesy First Virtual Communications, Inc.
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Recommendation
First Virtual Communications Click To Meet for use as directory services for ITN
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IP Video Task Force Members
Vern Draper, BSUFred Nay, BSU, Co-ChairMike Huffman, DOEAlan Benjamin, DoITTim Holt, INCOLSAGerry Oliver, ISU Jeff Steinmiller, ISUSteve Egyhazi, IUDoug Pearson, IUArt Mahan, Ind. Wesleyan
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IP Video Task Force Members
Brain Stone, IMCPL Jason Whiteaker, ITSC Jerry Sullivan, IntelinetChad Miller, IntelinetMichael Gay, Purdue UniversityDon Kindred, Purdue UniversityPat Smoker, Purdue UniversityEd Stanish, Purdue UniversityWayne Bohm, USITim Lockridge, USI
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IP Video Task Force Members
Carl Koenig, Vincennes UniversityRon Dekoker, IHETSDave Kaufman, IHETSTony McClelland, IHETSKevin Siminski, IHETSAlan Stillerman, IHETSEd Stockey, IHETS, Co-ChairMarty Stricker, IHETS
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IP Video Task Force Dial-Plan Committee Members
Vern Draper, BSU Fred Nay, BSU Steve Egyhazi, IU Michael Gay, Purdue University Earle Nay, Purdue Unviersity Ron DeKoker, IHETS Tony McClelland, IHETS Kevin Siminski, IHETS Shawn Solomon, IHETS Alan Stillerman, IHETS, Chair Ed Stockey, IHETS