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The SDB lets you use Tlink groups as a way to associate devices with a particular switch connection (which represents a switch).
You can associate a group of devices to a Tlink group. This has two advantages:
You know, by looking at the device object, which switch the device is associated with.
If a user inadvertently selects the wrong Tlink when opening a connection, the TSAPI service returns an error immediately indicating that the Tlink cannot control the device. If this control were not in place, the request would be forwarded all the way to Communication Manager before the error could be detected.