At CAS systems we are able to design, implement and maintain wired and wireless SCADA telecommunication systems.

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SYSTEM DESIGN & SITE SURVEY

At CAS systems we are able to design, implement and maintain wired and wireless SCADA telecommunication systems which supports many different types of industrial protocols and the architecture allows multiple clients to view the same data and seamless expansion to handle additional remote sites and i/o points. SCADA communications can employ a diverse range of both wired (lease line, dial-up line, fiber, ADSL, cable) and wireless media (licensed radio, spread spectrum, cellular, WLAN or satellite). We provide complete turnkey SCADA and Wireless SCADA communications solutions from the SCADA Host to the Satellite or Cellular communications or Private Radio communications. Our wireless SCADA systems can range from simple Point-Multipoint based on Spread-Spectrum system radios to IP-based enterprise-wide systems which use IP protocol to integrate a variety of autonomous communications subsystems (including private radio networks, cellular, and wired subsystems).

Radio Link Planning, Line of Sight Survey

We design state-of-the-art radio-based SCADA system to monitor and control assets. Our design process also involves conducting various radio surveys, initial software-based survey, and field survey, working around nature limiting factors to radio systems in lightning prone area. Our design criteria consider robustness, standard products, lightning tolerance, sunshield protection of field panels, resistance to Radio Frequency (RF) interference, and low recurring charges for phone service. Software surveys are only a rough determination that a radio path may exist; a field survey is required to confirm it. We perform the Field Radio Survey early in the process, preferably during initial system design to cater for propagation component not shown on the path profiles such as height and density of foliage in the area. The signal strength measurements made during the field radio survey will measure the RF attenuation contributed by the local foliage; using the Bullington signal strength technique3 improvement can be made in signal strength by increasing the antenna height over the terrain for instance resulting in higher Received Signal Strength Indication (RSSI). A very accurate path analysis results for predicting radio performance and link feasibility before you make the initial equipment investment. Spectrum analysis can be employed to further decrease the possibility of interference from other electromagnetic emissions.  Our design process include the selection of appropriate Radio Band.

We also design the repeater site as necessary to retransmit the radio signals received in order to increase the overall area that can be served. In most cases a repeater pole holds two antennas: a directional antenna and an omni-directional antenna. A directional antenna, receives the radio signal from the master and an omni-directional antenna mounted above it re-transmits the signal to the end sites. The field RSSI measurements in the previously completed field radio survey were analyzed to determine the number of repeater site required for the system coverage area. Repeater field survey are performed depending on the repeater sites, end sites, and paths were evaluated. From the repeater survey the number of sites that can be installed and meet both the visual survey recommendation and the target RSSI level will be determined.  Radio data stability is enhanced both by power and lower data rates. For SCADA radio systems, we use the most powerful transmitters possible and minimize the data that is sent so that high data rates are not required. CAS Systems will carefully weigh the benefits of using licensed versus unlicensed radio for every application with a complete understanding of the customer's expectations of system performance and cost.

Our expertise in telecommunication technology includes but not limited to the following:

  • Microwave, UHF, and VHF Link Engineering
  • Path Profiles and Coverage Analysis
  • Frequency Coordination and Licensing
  • Long-Haul Fibre-Optic Design
  • DWDM / CWDM Technologies
  • Transition from legacy TDM networks to IP/Packet
  • Routing and Switching Design
  • Network Architecture and Routing Using IP/MPLS
  • Multi Protocol Label Switching
  • LAN & WAN Network Switching and Routing (Ethernet through to 100GE)
  • Bandwidth Optimization / Routing Management
  • Network Services Architecture – Pseudowire, VPLS, VPRN
  • Service Provider Management – Internet Access and WAN
  • SCADA Integration with Related Telecommunication & Network Services
  • Firewalls
  • Network Intrusion Detection/Prevention.