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Application Notes / Intelligent Transport Network for Traffic Infrastructure
The main purpose for implementation of an intelligent network along motorways or railways is to ensure high traffic security. Along with other activities it can be assured by:
  • Remote control of messages on weather conditions on the route
  • Crash warning systems
  • Automatic accident reporting systems
  • Video monitoring and announcing of traffic jams
  • Remote control of security systems in tunnels (video monitoring, fire and smoke alarms) and viaducts (wind, rain, snow, slippery ice, fog)

The second purpose is to ensure additional public services:
  • Safety-related information
  • Advance traffic control, signalization and navigation
  • Advance electronic payment of motorway or train fees
  • Advance parking management etc.

The third purpose of an intelligent networks is to ensure speech and data communication between relevant access points and connections to the public communication network.

For the most secure operation of peripheral devices for traffic control, a reliable network must be established. The most commonly used one is BSHR with section protection by two or four fibers. When two fibers are used, in the case of section failiure, the traffic continues, but the traffic capacity is halved. In the case, where four fibers are used, one pair of fibers is intended only for the protection purpose; the protection is therefore 100 %.

The ring can be divided into a backbone network and an access chain. The backbone network ensures a high capacity traffic connection between main cities or stations. The second task of the backbone network is to ensure ring protection for the access chain. For that reason, the transmission capacity of the backbone must be much higher in comparison with the transmission capacity of the access chain.

Our proposal is:
  • To built a backbone network by high capacity STM-16 SDH equipment (2.5 Gbit/s).
  • The transmission capacity of the access chain can be lower: 155 Mbit/s (STM-1) It can be established by SparkLight.
  • In the access points different tributaries of SparkLight are available: STM-1, 45 Mbit/s, 34 Mbit/s or 2 Mbit/s. By using Cross Connect and Flexible Multiplexers, different data protocols (V.24, X.21, V.35, 10 BaseT/Ethernet) or services (ISDN, HDSL, ADSL, SDSL) are accessible.
  • If video transmission in some access points is expected, the VU2 unit of Iskra Transmission can be inserted directly into the SparkLight system.
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