● applications A reas Examples Education Distance teaching/learning interac U tively, examination on-network K.‖ Entertainment oD (video on demand), Live picture, on-line game/Chat, A Electronic Trading, shopping, stock exchange, it Commerce banking, fs Public Info nfo. News, magazine, forum. E-mail 202l/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University
2021/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 6 ⚫ Applications Distance teaching/learning interactively, examination on-network,… VoD (video on demand), Live picture, on-line game/Chat, … Trading, shopping, stock exchange, banking, … News, magazine, forum, E-mail,… Areas Examples Education Entertainment Electronic Commerce Public Info
Protocols Generally speaking, MMC includes almost all techniques in info. processing, transmission, and switching, the limited-space makes our discussion to packet-based network √H323 Specified by ITU in 1996 (V2, 1998) Describes the protocols stacks of terminal equipments and services for multimedia communication over LAN and IP networks These networks don't provide guaranteed QoS(Quality of Services) 202l/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University
2021/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 7 Protocols ✓H.323 • Specified by ITU in 1996 ( V2, 1998) • Describes the protocols stacks of terminal equipments, and services for multimedia communication over LAN and IP networks • These networks don’t provide guaranteed QoS (Quality of Services). Generally speaking,MMC includes almost all techniques in info. processing, transmission, and switching, the limited-space makes our discussion to packet-based network
√H.323 Architecture Control and management 皇脚 Video cro- lone Application Video Coding Audio Coding H225.0H225.0 H245(Sig. Ch)(RAS) RTCE P RTP TCP UDP NIC( Network Interface Controller) Gateway PBⅩ 4 Backbar Client Gatekeeper 202l/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University
2021/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 8 IP Backbone RTCP H.225.0 (Sig. Ch.) H.245 Control and management IP Video Coding Audio Coding Gatekeeper Gateway Client Terminal ✓ H.323 Architecture NIC ( Network Interface Controller) TCP PBX Application UDP RTP H.225.0 (RAS)
√ Main components in h323 Terminal; media processing and call control PC, Video/TV, Telephone, Fax H.323-compliant( multimedia-PC, Telephone,) Other terminals H 320 terminal on N ISDN H 310/H321 terminal on B_ISDN using ATM H. 324 terminal on PStn Gateway: translation of call signaling ng, media format, multiplexing, etc Gatekeeper网闸: providing administration of access. bandwidth address translation etc 202l/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University
2021/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 9 ✓ Main Components in H.323 – Terminal: media processing and call control • PC, Video/TV, Telephone, Fax, …. • H.323-compliant ( multimedia-PC,Telephone,…) • Other terminals: – H.320 terminal on N_ISDN – H.310/H.321 terminal on B_ISDN using ATM – H.324 terminal on PSTN – Gateway: translation of call signaling, media format, multiplexing , etc. – Gatekeeper网闸: providing administration of access, bandwidth, address translation, etc
√H323 Protocols stack Items Protocols or Function Audio Coding G711G.722,G.723.1,G.726,G.728,G.729 Video Coding H.261,H.263 RTP(Real-Time Trans. Prot. Processing related to sequencing, sync, payload type, source identification RTCP Additional info to session participants: QoS feedback, identification, session control RAS: Registration, Admission, Status RAS(H.225.0) Conveying the registration, admissions, bandwidth, status Sign. Ch (H 225.0) setup or release of call connection based on Q931 ChCTRL(H245)Capability Negotiation, coding, conference req. UDP Efficient but unreliable transport of packets TCP Conn.-oriented, reliable transport of packets 202l/1/27 Dr. Zhanqi Xu, National Key lab on Isn, Xidian University 10
2021/1/27 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 10 ✓ H.323 Protocols Stack Audio Coding G.711, G.722, G.723.1, G.726, G.728, G.729 Video Coding H.261, H.263 RTP(Real-Time Trans. Prot.) Processing related to sequencing, sync., payload type, source identification,… RTCP Additional info. to session participants: QoS feedback, identification, session control,… RAS (H.225.0) RAS: Registration, Admission, Status Conveying the registration, admissions, bandwidth, status, … UDP Efficient but unreliable transport of packets Ch. CTRL (H.245) Capability Negotiation, coding, conference req.,… Sign. Ch. (H.225.0) setup or release of call connection based on Q.931 TCP Conn.-oriented , reliable transport of packets Items Protocols or Function