An application Protocol for Fast Long Distance Network Katsushi - - PowerPoint PPT Presentation

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an application protocol for fast long distance network
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An application Protocol for Fast Long Distance Network Katsushi - - PowerPoint PPT Presentation

May 02, 2023 394 likes •505 views

An application Protocol for Fast Long Distance Network Katsushi Kobayashi ikob@ni.aist.go.jp National Institute of Advanced Industrial Science and Technology Off topic In 1st day panel, Injong Rhee presented high-speed TCP variant issue

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National Institute of Advanced Industrial Science and Technology

An application Protocol for Fast Long Distance Network

Katsushi Kobayashi ikob@ni.aist.go.jp

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National Institute of Advanced Industrial Science and Technology

Off topic

  • In 1st day panel, Injong Rhee presented high-speed TCP variant issue analogy

between just raising sea-level. I felt it as “Global Internet Warming”.

  • Not sure whether it is “truth” or not.
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National Institute of Advanced Industrial Science and Technology

DV/RTP video system

DV/RTP Box DV/RTP Box

IEE1394 network Internet

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National Institute of Advanced Industrial Science and Technology

DV video format

  • DV video format is designed for digital video recording format.
  • Both consumer and professional (IEC61834, SMPTE314, SMPTE370)
  • Intra-frame only compression (I-frame in MPEG) using DCT and

VLC.

  • no inter-frame (P

, B) compression.

  • Fixed and higher data rate: 25Mbps@SDTV, 100Mbps@HDTV.
  • CD-quality audio stream is bundled into video stream.
  • Digital i/f is also defined (on IEEE1394, SDI)
  • RTP encapsulation for SDTV is specified in RFC3189, HDTV is now in

progress.

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National Institute of Advanced Industrial Science and Technology

DV/RTP video system

Pros:

  • Video packet stream from IEEE1394 is well-shaped CBR.
  • simply forwards incoming packet to network.
  • Easy to predict traffic behavior.
  • No inter-frame compression.
  • Small codec delay (< 200 msec.)
  • Resilient to packet loss (shuffling in codec, I-frame only)
  • No quality losses on analog video segment.
  • Better quality video comm. system in affordable cost.
  • home camcorder + IEEE1394 PC card (< $1,000 USD)

Cons:

  • High bandwidth 30Mbps (inc. header overhead).
  • Difficult to change codec bandwidth.
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National Institute of Advanced Industrial Science and Technology

How different from other systems.

PCI BUS IEEE 1394 Video Capture CPU/ Memory NIC Analog Video IEE1394

  • When using video capture system:
  • Rate control is required, even in fixed rate encoding
  • encoding is done at each frame completion (25-30 frame/sec)
  • Quality loss in Analog/Digital conversion
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National Institute of Advanced Industrial Science and Technology

Real-time video can support e-Science

  • Real-time video is not only for interactive conversation.
  • Enable “expensive” facility remote-operation from own site.
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Telemicroscopy

Datagrid

ＵＨＶＥＭ Controller

ＣＣＤ camera (dynamic image) ＣＣＤ camera (static image)

ＵＨＶＥＭ Telecontrol Server Telecontrol Client Dynamic Image Server Dynamic Image Client Static Image Server Datagrid Storage Datagrid Storage

Osaka University, Japan Computational Resource Provider

Analyzed result viewer Datagrid Storage Cluster for Image analysis Video Conference System Video Conference System

UCSD, USA

(Earlier SDTV version video system is based on DV video, Latest HDTV system is based on JPEG2000, Courtesy of Y. Akiyama, CMC, Osaka Univ.)

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National Institute of Advanced Industrial Science and Technology

Requirements from TELEMICROSOPE

  • Provide comfortable remote operation with real-time dynamic CCD image.
  • Manipulate specimen, change focus, beam intensity.

➡ Minimize delay, (e.g., encoding, queuing, , decoding, playout buffering)

  • No special circuit / QoS provisioning.
  • To work on usual REN IP service.

➡ Resilient to packet loss