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WDM - Wave Division Multiplexing - An optical technology that allows for the transmission of two separate signals over a single strand of fiber optic cable. In iDAS and oDAS environments, such technology is usually used to optically connect a DAS Head-End with a Remote Unit
WLAN - Wireless Local Access Network - Network that links two or more devices using wireless methods. Usually covers relatively small area and typically acccessed via WiFi but other methods are available.