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Define how a PSTN Channel is Selected for Communications

You can use the ClearSCADA Server Configuration Tool to define how ClearSCADA determines which of the available PSTN channels are used for communications with a PSTN outstation.

There are two methods for deciding which PSTN channel is used to make a call to an outstation:

To define the method used for selecting PSTN channels:

  1. Access the ClearSCADA Server Configuration Tool (see Accessing the ClearSCADA Server Configuration Tool).
  2. Expand the Global Parameters branch of the tree structure.
  3. Select Channels to access the Channels section.
  4. Use the option buttons in the PSTN section to choose the required method of PSTN channel selection:
    • Select the Use channel with fewest total calls option button to enable balanced load sharing. We recommend that you use this method unless there are known issues with the communication lines.
    • Select the Use channel with highest quality option button to set ClearSCADA to choose a channel based on its availability and quality factor. We recommend that you only use this method if there are known issues with the communication lines.
    • When you choose the Use channel with highest quality option, the Quality Factor field becomes available. In the Quality Factor field, enter the number that will be used as:
      • The quality factor that will be allocated to every new PSTN channel
      • The highest quality factor that any PSTN channel can have. Each PSTN channel has its own quality factor that rises and falls when it is used for good calls and failed calls respectively. But the quality factor of a channel cannot drop below 1 or rise above the amount you define in the Quality Factor field in the Server Configuration Tool’s Channels settings.
  5. Right-click on the system icon in the tree-structure, and select the Apply Changes option to apply the changes.

When you have finished defining how ClearSCADA should choose a PSTN channel, you can either configure other Channels settings:

Or:


ClearSCADA 2015 R2