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Samples in periodicals archive:
By implementing a secondary communications channel (called a sideband channel), the distributed client and server significantly benefit by having a clear separation of concerns between the secondary control channel that controls a background process and other primary channels in the system such the graphical user interface (GUI) event callback channel.
Four of the new "try before you buy" options are: P25 Explicit Messaging, P25 Secondary Control Channel Broadcast (SCCB) Messaging, P25 Adjacent Status Broadcast Messages, and P25 Unit to Unit/PSTN Interconnect.