DAS - Distributed Antenna System - DAS is a network of antennas designed to provide coverage (wireless signals) to an area with little or no otherwise coverage. This could be inside a building or a small defined geographic region.
DL - Downlink - Downlink describes the direction of traffic from BTS & DAS Head-Ends to a user’s handset or portable device
DWDM - Dense Wave Division Multiplexing - An optical technology that allows for more than eight separate signals over a single strand of fiber optic cable. It is usually reserved for digital data transmission.