Post on 24-Sep-2020
TERENATERENA2nd Workshop: Connecting Schools to 2nd Workshop: Connecting Schools to NRENsNRENs
John S. MartinJohn S. MartinJANET Videoconferencing Service ManagerJANET Videoconferencing Service Manager
JVCS Management CentreJVCS Management Centrejohn.martin@ed.ac.ukjohn.martin@ed.ac.uk
Technical issues in videoconferencingTechnical issues in videoconferencing
Where have schools Where have schools ‘‘visitedvisited’’this term?this term?
FranceFrance
SpainSpain
SloveniaSlovenia
NorwayNorway
CanadaCanada United StatesUnited States
MexicoMexicoSwedenSweden
Hong KongHong Kong
Over 300 conferences this termOver 300 conferences this term
GreeceGreeceSwitzerlandSwitzerland ItalyItaly
RussiaRussia PolandPoland
LibyaLibyaHungaryHungary
CroatiaCroatia
CyprusCyprus
BrazilBrazil
LithuaniaLithuania
What will we look atWhat will we look at
StandardsStandardsGlobal Dialling SchemeGlobal Dialling SchemeExperiencesExperiencesProprietary systemsProprietary systemsPossible solutionsPossible solutions
Common Standards used in Common Standards used in videoconferencingvideoconferencing
H.320H.320H.323H.323
H.261H.261--H.264 video H.264 video G.711G.711--G.722 audioG.722 audioT.120 dataT.120 data
H.239H.239Data with Audio/VideoData with Audio/Video
H.460.18 & H.460.19H.460.18 & H.460.19Firewall traversal & NATFirewall traversal & NAT
SIPSIPSession Initiation ProtocolSession Initiation ProtocolMultimedia sessionsMultimedia sessionsModular designModular design
The Global Dialling SchemeThe Global Dialling Scheme
Standard international dial plan developedStandard international dial plan developedEach registered endpoint has a unique international E.164 numberEach registered endpoint has a unique international E.164 numberUK example: 0044 02001 1 1234 123UK example: 0044 02001 1 1234 123
1231231234123411020010200100440044
Endpoint Endpoint numbernumber
DFES DFES numbernumber
CategoryCategoryRegional/Regional/Local PrefixLocal Prefix
International International PrefixPrefix
Gatekeeper Hierarchy Gatekeeper Hierarchy
Ed-Aext 541
World Gatekeeperprefix 00
JANETUK Gatekeeper
international prefix0044
SwanseaGatekeeper
prefix004401100
EdinburghGatekeeper
prefix004401102
Swan-Aext 456
NL Gatekeeperprefix 0031
SURFnetGatekeeper
prefix3023053
UtrechtGatekeeper
prefix30253
SURFnet-A
ext 67
Utrecht-A
ext 49
Swan-Bext 123
World DirectoryGatekeeper
Multiple resilientgatekeepers
distributed acrossthe world
National DirectoryGatekeepers
Single or resilientclusters
OrganisationGatekeeper
Single or resilientcluster
0044 01100 456
Global Dialling SchemeGlobal Dialling SchemePartnersPartners
SLOVENIASLOVENIARUSSIARUSSIALITHUANIALITHUANIAEIREEIRESWEDENSWEDENHUNGARYHUNGARYPOLAND POLAND CROATIA CROATIA LIBYA LIBYA FRANCEFRANCEGREECEGREECEGREAT BRITAINGREAT BRITAIN
USA USA SWITZERLANDSWITZERLANDGERMANYGERMANYCZECHCZECHITALY ITALY PORTUGALPORTUGALDENMARK DENMARK CYPRUSCYPRUSSPAINSPAINNETHERLANDSNETHERLANDSBRAZIL BRAZIL NORWAYNORWAY
ExperiencesExperiencesRestrictions within country Restrictions within country
Systems work well internally, but poor external Systems work well internally, but poor external connectivityconnectivity
Links to other Links to other MCUsMCUsMore collaboration required from manufacturers More collaboration required from manufacturers –– standards!standards!
Links direct to international endpointsLinks direct to international endpointsFirewall issuesFirewall issuesGatekeeper registrationsGatekeeper registrations
Gatekeeper Hierarchy and NeighbouringGatekeeper Hierarchy and NeighbouringHopHop--count/incompatibility issuescount/incompatibility issuesLack of configurationLack of configuration
More ExperiencesMore ExperiencesSecuritySecurity
NATNATProxyProxy
Restrictions on concurrent conferencesRestrictions on concurrent conferencesIncreased LatencyIncreased Latency
E.164E.164Lack of gatekeeper!Lack of gatekeeper!
ISDN linesISDN linesDial in/out Dial in/out –– billingbilling
Equipment incompatibilityEquipment incompatibility
Even More experiencesEven More experiencesBooking & CommunicationBooking & Communication
Time ZonesTime ZonesLanguageLanguageTechnical expertiseTechnical expertise
Bandwidth!Bandwidth!Packet lossPacket lossDuplex mismatchesDuplex mismatches
SuppliersSuppliersIncorrect adviceIncorrect adviceSales drivenSales driven
Proprietary SystemsProprietary Systems
External connectivity External connectivity –– gatewaygatewaySecuritySecuritySupportSupportScalabilityScalabilityBookingBooking
Possible SolutionsPossible SolutionsTesting & more testingTesting & more testing
MCUsMCUsGatekeepersGatekeepersEndpointsEndpoints
Understanding of global requirementsUnderstanding of global requirementsStandardsStandardsQuality Assurance & conference preQuality Assurance & conference pre--checkschecks
EndpointsEndpointsPrePre--conference checks for guest endpointsconference checks for guest endpoints
VTASVTASFeedback to manufacturersFeedback to manufacturersBrief SuppliersBrief Suppliers
Quality AssessmentQuality Assessment
Objective and SubjectiveObjective and SubjectiveVideo & AudioVideo & AudioNetwork StatsNetwork StatsInteroperability testInteroperability testGuests – connectivity test
SummarySummary
Collaboration Collaboration –– requires guaranteed requires guaranteed interoperabilityinteroperabilityTechnical issues well documentedTechnical issues well documentedRequires political endorsementRequires political endorsement
DocumentationDocumentation
All VCSP documentation atAll VCSP documentation at
www.jvcs.ja.net/schoolswww.jvcs.ja.net/schoolswww.ja.net/schoolswww.ja.net/schools
Any Questions?Any Questions?
John S. MartinJohn S. MartinJVCS Management CentreJVCS Management Centre
Tel: 0131 650 6743Tel: 0131 650 6743EE--Mail: Mail: John.Martin@ed.ac.ukJohn.Martin@ed.ac.uk