Active DAS
Converts RF signals from source to distribute over optical fiber or ethernet cable. If the signal comes from multiple sources, a master unit combines them to distribute it as a digital signal. The digital signal is transmitted over fiber or ethernet cable to the Remote Radio Units (RRUs). The RRUs, also referred to as nodes or active antennas, convert the signal back to RF. Active DAS is comparatively more expensive than hybrid and passive systems.
Passive DAS
It uses passive RF devices like splitters, coaxial cables to distribute the signals. There will be more attenuation in the power broadcast if the antenna is away from the single source & amplifiers. Hence, it is not preferred to have long runs of cable. Passive DAS has low cost because it does not require an analog-to-digital converter, and no additional equipment is required to support multiple carriers.
Hybrid DAS
Hybrid DAS uses features of active and passive DAS. Since the RRUs are separate from the antennas, hybrid DAS can use both fiber and coaxial cable. It includes RRU on each floor, which converts the digital signal to an analog signal. The analog signal further connects to multiple antennas with coaxial cable on the same floor. It is expensive than passive DAS but cheaper than active DAS. The installation of hybrid DAS is complicated as it requires both coaxial and fiber cables.
Digital DAS
It converts analog signal to digital signal and then transports over coaxial or fiber cable to the antennas. The conversion & combination process makes digital DAS an expensive option, but it is less susceptible to interference. Additionally, the digital DAS platform allows the capacity of the signal sources to be directed to different areas as needed.
AFU TELECOM is a Wireless Telecom Solution provider with professional supporting on our customers' business globally. AFU TELECOM is always focusing on and specializing in O-RAN, Marco Cell, Small Cell, Active DAS, Public Safety and Optics Network Solutions including Antennas, Filters/Combiners/TMAs, RF Repeaters, Optics Devices and Site Accessories, especially AFU Core Team are very professional in wireless telecom with rich experience on our product portfolios. The Highest Priority of AFU TELECOM is Customers' Satisfaction and Product Quality. AFU MISSION IS TO CONNECT EVERYTHING!