San Francisco is a center of innovation and deserves a state-of-the-art next-generation mobile broadband network to meet the needs of its tech savvy residents and businesses. As home to hundreds of high tech businesses and data-hungry consumers, San Francisco’s residents demand more from their networks.

San Francisco’s topography presents challenges for wireless signals. Several factors — including hills, trees and buildings in the area — affect how wireless signals travel.


What is a DAS and how does it work?

A Distributed Antenna System, or DAS, is a network of smaller, spatially separated antenna nodes connected to the communications network.

A DAS network splits the transmitted signal among several smaller antennas to provide coverage and reliability over the same area as a single cell tower antenna. DAS networks are effective in areas with difficult topography, structural impediments (e.g. buildings, or within buildings), or in locations where, for a variety of reasons, it is not optimal to build a traditional macro site.

Why DAS?

Microcell antennas of a DAS network are significantly smaller than the macrocell antenna of a cell tower, and its footprint is much smaller. A DAS allows for more widespread coverage because several sites can be deployed to more effectively cover an area of varied topography or large edifices.

A DAS can provide multiple service platforms (mobile broadband, mobile radios, pagers PCS, UMTS) and is effective for public safety alert systems.

Why do we need a DAS and what will it do for me?

San Francisco’s unique topography, combined with its building density, pose a challenge to wireless network performance. Deploying a DAS network will increase network performance by providing greater coverage throughout the city and filling small gaps in existing coverage. AT&T’s DAS network will improve call quality and reliability while also supporting stronger signals, increased traffic and faster transfer of data.

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