The Open Systems Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below...
A guard band is a narrow frequency range that separates two ranges of wider frequency. This ensures that simultaneously used communication channels do not experience interference, which would result in decreased quality for both transmissions.
Guard bands are used in frequency division multiplexing (FDM).
A spectrum's unused portion is intended to prevent crosstalk, or noise or interference from other modulated signals on the same transmission medium, such as AM or FM radio.
The guard band concept applies to wired and wireless communications. It also simplifies the process of signal filtering for hardware, software or both.
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