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Standards for MM COMMStandards for MM COMM

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InterpersonalInterpersonal

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Interactions over the InternetInteractions over the Internet

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EntertainmentEntertainment

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Protocol BasicsProtocol Basics

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A/V Conferencing in Circuit-mode A/V Conferencing in Circuit-mode NetworksNetworks

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Audio-Visual Conferencing StandardsAudio-Visual Conferencing Standardsin Circuit-mode Networkin Circuit-mode Network

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T.120: Standards for User Data App.T.120: Standards for User Data App.

Media types T.124: sharing of text for what is known as text char T.126: still-image and whiteboard sharing T.127: sharing of file contents T.128: sharing of text documents and spreadsheets

Communications T.122: MCU procedures T.125: MCS procedures T.123: a series of network-specific transport protocols

all of which provide a reliable transport service

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MultiplexingMultiplexing

Multiplexing of audio, video, and data streams together for transmission over the network

H.221 TDM: fixed portions of bandwidth are allocated

H.223

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System ControlSystem Control

H.242 Negotiation of the bandwidth/bit-rate to be used for

each stream Inform the multipoint controller part of MCU of its

capabilities (e.g. video format, A/V compression standards, T.120 user data applications, proposed bit rate of each channel)

Then, MCU negotiates and agrees a minimum set of capabilities

H.245 Exchange of messages for negotiation capabilities Opening and closing of logical channels Transmission of the contents of the multiplex table,

choice of adaptation layers

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H.323: A/V Conferencing over Packet-H.323: A/V Conferencing over Packet-switched Networkswitched Network

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Call Setup procedure using H.323 Call Setup procedure using H.323 GatekeeperGatekeeper

H.323 gatekeeper Limit # of concurrent calls

to provide QoS quarantee in LAN environment

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H.323 multiplexing/demultiplexingH.323 multiplexing/demultiplexing

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Interworking using an H.323 GatewayInterworking using an H.323 Gateway

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IETF Interpersonal CommunicationsIETF Interpersonal Communications

SIP/SDP

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E-mail over InternetE-mail over Internet SMTP, RFC 821 POP3, RFC 1939 IMAP MIME (Multipurpose Internet Mail Extensions), RFC 2045

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Protocol Stacks for email over Protocol Stacks for email over InternetInternet

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E-mail GatewayE-mail Gateway

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Information BrowsingInformation Browsing

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E-CommerceE-Commerce

Network Security PKI

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Movie/Video-on-demand: telephonyMovie/Video-on-demand: telephony

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Movie/Video-on-demand: Cable TVMovie/Video-on-demand: Cable TV

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Interactive TV: Digital TVInteractive TV: Digital TV

Video: MPEG-2 Audio: MEPG Layer 2

(PAL), Dolby AC3 (NTSC, ATV/GA)

TV Program Multiplexing

TS format