CMPE 150 – Winter 2009 Lecture 19 March 12, 2009 P.E. Mantey.

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Presentation transcript:

CMPE 150 – Winter 2009 Lecture 19 March 12, 2009 P.E. Mantey

Syllabus

Internet Layering Level 5 -- Application Layer (rlogin, ftp, SMTP, POP3, IMAP, HTTP..) Level 4-- Transport Layer(a.k.a Host-to-Host) (TCP, UDP) Level 3-- Network Layer (a.k.a. Internet) (IP, ICMP, ARP) Level 2-- (Data) Link Layer / MAC sub-layer (a.k.a. Network Interface or Network Access Layer) Level 1-- Physical Layer

Today’s Agenda Applications Layer DNS nslookup Multimedia Applications of the future Cisco SmartCare (Matt Rollins) GoRemote Wireless Access (Anselm Kia) GoRemote is now iPass (ipass.com) (username:cmpe | password:cmpe)

Multimedia Introduction to Audio Audio Compression Streaming Audio Internet Radio Voice over IP Introduction to Video Video Compression Video on Demand The MBone – The Multicast Backbone

Introduction to Audio (a) A sine wave. (b) Sampling the sine wave. (c) Quantizing the samples to 4 bits.

Audio Compression (a) The threshold of audibility as a function of frequency. (b) The masking effect.

Streaming Audio A straightforward way to implement clickable music on a Web page.

Streaming Audio (2) When packets carry alternate samples, the loss of a packet reduces the temporal resolution rather than creating a gap in time.

Streaming Audio (3) The media player buffers input from the media server and plays from the buffer rather than directly from the network.

Streaming Audio (4) RTSP commands from the player to the server.

Internet Radio A student radio station.

Voice over IP The H323 architectural model for Internet telephony.

Voice over IP (2) The H323 protocol stack.

Voice over IP (3) Logical channels between the caller and callee during a call.

SIP – The Session Initiation Protocol The SIP methods defined in the core specification.

SIP (2) Use a proxy and redirection servers with SIP.

Comparison of H.323 and SIP

Video Analog Systems The scanning pattern used for NTSC video and television.

The JPEG Standard The operation of JPEG in lossy sequential mode.

The JPEG Standard (2) (a) RGB input data. (b) After block preparation.

The JPEG Standard (3) (a) One block of the Y matrix. (b) The DTC coefficients. (a) (b)

The JPEG Standard (4) Computation of the quantized DTC coefficients.

The JPEG Standard (5) The order in which the quantized values are transmitted.

The MPEG Standard Synchronization of the audio and video streams in MPEG-1.

The MPEG Standard (2) Three consecutive frames.

Video on Demand Overview of a video-on-demand system.

Video Servers A video server storage hierarchy.

Video Servers (2) The hardware architecture of a typical video server.

The MBone – The Multicast Backbone MBone consists of multicast islands connected by tunnels.

Future is now…