Distributed Antenna System (DAS) FAQs

A distributed antenna system (DAS) is a network of spatially separated antennas connected to a common source, improving wireless service within a building or area by eliminating dead spots. It functions by distributing a signal (from a cell tower or a base station) through cables and amplifiers to multiple antenna nodes placed throughout a building or area. These nodes act like mini cell towers, improving coverage and capacity, and are particularly useful in large buildings, stadiums, and complex environments where traditional signal penetration is challenging.

DAS enhances indoor cellular coverage, ensuring consistent wireless connectivity. It benefits areas with complex architecture, high user density, or where signals are obstructed.

Distributed Antenna Systems (DAS) differ from traditional cell towers in several key ways:

  • Coverage Area: Traditional cell towers are designed to cover large outdoor areas, potentially spanning several miles. In contrast, DAS is primarily used to provide coverage in specific, often indoor, locations like buildings, stadiums, or campuses, where traditional towers can’t effectively reach.
  • Size and Placement: Cell towers are typically large structures placed outdoors. DAS consists of smaller antenna nodes that can be discretely installed inside or around a building.
  • Signal Strength and Quality: DAS can provide stronger and more reliable signal strength in its targeted area, as it brings the signal source closer to the end user. This is particularly beneficial in areas where building materials or other obstacles block signals from traditional cell towers.
  • Capacity and Scalability: DAS is designed to handle high-capacity needs in densely populated areas or in locations with large crowds, such as stadiums or concert halls. It can be scaled and adjusted more easily to meet the specific demands of the area it serves.

DAS (Distributed Antenna System) and Wi-Fi are both wireless systems, but they serve different purposes. DAS is primarily designed to enhance cellular network coverage within buildings or specific areas, ensuring consistent signal strength for mobile devices.

On the other hand, Wi-Fi provides wireless internet connectivity using radio frequencies, typically in the 2.4 GHz and 5 GHz bands. While DAS enhances voice and mobile data coverage, Wi-Fi facilitates local network connections and internet access.

A Distributed Antenna System (DAS) offers several advantages:

Enhanced Coverage: DAS eliminates dead spots, ensuring consistent cellular signals even in challenging environments like basements or areas with dense construction.

Capacity Handling: DAS efficiently manages high user density, ensuring stable connectivity during peak times in venues like stadiums or conference centres.

Flexible Installation: DAS can be designed for various environments, from high-rises to underground facilities.

Reduced Strain on External Networks: By handling local cellular traffic, DAS reduces the load on external cell towers.

Versatility: Besides cellular signals, DAS can also support other wireless services, including emergency radios and potentially Wi-Fi, making it a multifunctional solution.

DAS system costs depends on several factors: the building’s size, the type of DAS (active or passive), system design complexity, and the number of supported carriers. On an average, for commercial buildings, costs range from $1 to $5 per square foot, but can be higher for specialized requirements.


CBRS stands for Citizens Broadband Radio Service. It is a 150 MHz band of spectrum, from 3.55 to 3.70 GHz. This was traditionally used by the U.S. military for radar systems. However, in recent years, the Federal Communications Commission (FCC) has opened up this band for shared commercial use.

CBRS is versatile in supporting both private LTE and private 5G networks, alongside other applications. It enables fixed wireless access, mobile operator services, and IoT applications, providing flexible and cost-effective connectivity.

The three tiers for CBRS are:

Incumbent Access: Includes federal and satellite users. They have the highest priority and are protected from interference.

Priority Access License (PAL): Commercial users who obtain short-term licenses through auctions. They receive protection from General Authorized Access users.

General Authorized Access (GAA): Open for any user without a license but must avoid causing interference to higher tiers.

The CBRS band introduces dynamic spectrum sharing, allowing multiple entities, from federal users to private networks, to coexist and maximize efficient spectrum use.


SOLiD is a leading provider of distributed antenna systems (DAS) for wireless coverage. SOLiD offers innovative and cost-effective solutions for enhancing cellular network performance in buildings and venues.

SOLiD offers a range of products and services for wireless coverage, including:

  • ALLIANCE 5G DAS: A modular and scalable distributed antenna systems (DAS) platform that supports multiple operators, bands, and technologies. ALLIANCE DAS can be deployed in various environments, such as stadiums, airports, hotels, hospitals, and campuses.
  • SOLiD Services: A comprehensive suite of services that covers the entire lifecycle of DAS projects, from training to design and engineering, monitoring, maintenance, and support.
  • DAS Training and Certification: SOLiD’s Training and Certification Program offers in-depth knowledge and practical expertise in DAS, designed and led by experienced engineers. The program covers DAS architecture, signal propagation, and troubleshooting through theoretical and hands-on learning. Completing the program awards a globally recognized certification, equipping participants for the wireless communication industry.

Using SOLiD’s solutions can provide several benefits, such as:

  • Improved Coverage: SOLiD’s solutions can eliminate dead spots and enhance signal quality in challenging environments.
  • Increased Capacity: SOLiD’s solutions can handle high user density and traffic demand in venues with large crowds.
  • Future-Ready Technology: SOLiD’s solutions can support the latest wireless technologies, such as 5G, CBRS, and O-RAN, as well as legacy technologies.
  • Cost-Effective Deployment: SOLiD’s solutions can reduce the capital and operational expenses of DAS deployment by using modular components, fiber-optic cables, and remote units.

SOLiD ALLIANCE DAS uses analog RF over fiber transport technology to achieve higher bandwidth, lower latency, lower cost, and lower power consumption.

Both technologies have features and benefits; in fact, SOLiD has analog (ALLIANCE) and digital (GENESIS) DAS product lines.

In the United States, analog transport has a big benefit because of two very large frequency bands; the 2500 and 3700 MHz bands have 194 and 280 MHz of spectrum, respectively, and the overall large amount of spectrum available between 600 MHz and 3980 MHz.

For example, all sub-4GHz cellular bands can be transported over only two strands of fiber using analog transport. At the same time, it typically takes six or more fibers (with accompanying SFP+ modules) to transport that same amount of spectrum with digital transport.

Digital DAS has advantages in its capability to use standard CAT cabling, which is typically less expensive to install than fiber but comes with distance limitations. Analog systems consume less power because they don’t have to convert analog-to-digital and digital-to-analog. Digital systems have a headend space advantage, but they introduce additional latency during the analog-to-digital and digital-to-analog conversion processes, which can introduce limitations in the cell radius (inclusive of fronthaul DAS).

The bottom line is that features and benefits matter and must be evaluated in the context of each venue’s requirements because there is no one right answer between digital and analog DAS.

Yes. SOLiD has the following certifications:

  • TL 9000 R6.3 / R5.7

SOLiD Training and Support FAQs

Contact your Regional Sales Manager, provide your First name, Last name, and email address, and request a SOLiD University account. If you don’t know who your Regional Sales Manager is, please contact

You will need a SOLiD University Account. Once logged on, navigate to the “catalog” section, and select “Certification Courses,” then add your desired certification courses to the cart and check out.

Currently, we provide certifications for DAS 101, ALLIANCE Product, and ALLIANCE Commissioning & Integration. In the future, we are looking to add more, based on demand, such as ALLIANCE Design and ALLIANCE Operations.

SOLiD University will accept credit card for the course. If you cannot use a credit card, please contact

Product data sheets, along with product manuals, RMA request, application notes, firmware and GUI software can be conveniently accessed from our Support & Service page.

Contact our DAS experts, emailing, or calling (888) 409-9997.

Contact your regional sales manager or solutions engineer or Contact Us:

SOLiD ALLIANCE supports all commercial and public safety frequency bands below 4 GHz.