1 Standards for MM COMM. 2 Interpersonal 3 Interactions over the Internet.

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Presentation transcript:

1 Standards for MM COMM

2 Interpersonal

3 Interactions over the Internet

4 Entertainment

5 Protocol Basics

6 A/V Conferencing in Circuit-mode Networks

7 Audio-Visual Conferencing Standards in Circuit-mode Network

8 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

9 Multiplexing  Multiplexing of audio, video, and data streams together for transmission over the network  H.221  TDM: fixed portions of bandwidth are allocated  H.223

10 System 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

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

12 Call Setup procedure using H.323 Gatekeeper  H.323 gatekeeper  Limit # of concurrent calls to provide QoS quarantee in LAN environment

13 H.323 multiplexing/demultiplexing

14 Interworking using an H.323 Gateway

15 IETF Interpersonal Communications  SIP/SDP

16 over Internet  SMTP, RFC 821  POP3, RFC 1939  IMAP  MIME (Multipurpose Internet Mail Extensions), RFC 2045

17 Protocol Stacks for over Internet

18 Gateway

19 Information Browsing

20 E-Commerce  Network Security  PKI

21 Movie/Video-on-demand: telephony

22 Movie/Video-on-demand: Cable TV

23 Interactive TV: Digital TV  Video: MPEG-2  Audio: MEPG Layer 2 (PAL), Dolby AC3 (NTSC, ATV/GA) TV Program Multiplexing TS format