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Communication Mediums for Signal, ITS, and Freeway Surveillance Systems Final Report (1996) / Chapter Skim
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A.2.6 ITS Network Architecture and Topology
Pages 366-377

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From page 366...
... Table A.2.5~3 Anticipated AS Link Loads I Link I Data Rate I Local Links Data 2400- 9600 bps Digital Video 3 - 8 Mbps Digital Voice ~ Backbone Links ~ ~ ~ 000 Mbps (Node-to-Node) Center-to-Center Links 155.2 Mbps District-to-Region Links 15~ Region-to-National Links 9~ eel A.2.6 ITS Network Architecture and Topology Architecture refers to technology, fault tolerant redundancy, TOC backup, security, and standard requirements.
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From page 367...
... / I J llJ J z ~ · · I Lo O I Z J L-I 11 111 X C J ~ O J z O Lo am ~ CY Z Z 0 ~ :1:': 'EC [: ~ I tr it: AS C, o ~ ZO ~ LLI J ~ Ill (A - <: _ L o ~ 7 A O ~ ~ Y 2 CY I ~ m tr cn m L~J x ~ llJ _ J ~ ...
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From page 369...
... , data sharing by multiple jurisdictions, and the possibility of shared communication infrastructures. This requires open standards Hat are most efficiently supported on a multimedia network.
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From page 371...
... LO ~ ~ Z llJ CD LO _ J ...
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From page 372...
... connect field devices to communication nodes. At nodes, the various digitized voice, data, and video signals are multiplexed for communication over Me higher bit rate Backbone Links (BL)
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From page 373...
... Because MPEG-2 Video encoders are still expensive, near-term video should perhaps be maintained as analog from camera equipment cabinet to a communication node where it is digitized and switched for transmission to Me TOC and/or over ITS jurisdictions or services. It should be noted Mat uncompressed video requires approximately 45 Mbps bit rates (DS-3 rate)
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From page 374...
... The deployed ITS communication architectures must be based on standards Cat are modular, scalable, and extensible. Fortunately, as depicted in Figure A.2.6-4, He communication industry supports a set of physical layer standards based on hierarchial multiplexed data rate capabilities: Multiplexed RS-232 (below 64 kbps)
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From page 375...
... FIBER | 45 M bps I WIRE \ 28 DS- ~ / D S ~ ~ INTERFACE 1.544 Mbps ~ DS O | INTERFACE L~ · ~ ''X~\ 1200 bps WI RELESS 2400 bps 4800 bps 9 600 bps 1 9,200 bps 38, 400 bps 1 200 bps 2400 bps 4800 bps 9600 bps 1 9,200 bps 38,400 bps , 1 INTERFACE | 21 STANDARDS BASED DIGITAL MULTIPLEXED I DATA RATE HIERARCHY ~FIGUREA.2.6-4 -~n
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From page 376...
... This hierarchy of data rates and interfaces supports the required interfaces for current and anticipated ITS field devices and related interfaces: I Full-motion video is supported by ~ to 4 DS-Is for MPEG-2 compressed digital video, while DS-3 is available for uncompressed digital video 2.
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Key Terms

  • communication infrastructure
  • digital video
  • data load
  • video signals
  • bit rate

  • traffic control
  • backbone links
  • data rate
  • bit rates
  • communication architectures

  • standard interfaces
  • video requirements
  • data network
  • repeaterless distances
  • analog video

  • data rates
  • camera equipment
  • cctv camera
  • standards based
  • distribution links

  • data sharing
  • implemented using
  • communication architecture
  • field devices
  • lls communication

  • modem technology
  • modem integrated
  • web defined
  • communication infrastructures
  • incompatible propnetary


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