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