Understanding the Complexities of DAS Installation Costs

Materials

• Active Materials: This category covers electronics or components essential for the functioning of the DAS.
• Passive Materials: Infrastructure elements necessary to support the DAS operation fall under this category.

Project Management

You have the option to handle project management internally or outsource it. Depending on the project scale, project management can be further divided into field project management and overall project management.

Services

• Survey and Engineering: Includes the collection of benchmark data and necessary assessments.
• Construction: The physical building and installation process of the DAS.
• Commissioning, Integration, and Turn-up: Involves the DAS setup, integration, and activation.

It’s important to note that the close-out package and maintenance are excluded from this list of services. While the close-out package is crucial, it often doesn’t require a separate vendor. Maintenance costs typically become operational expenses after DAS construction.

Electronics

These are the power-reliant devices and are typically physically heavier than other materials. They are often referred to as the “heavy stuff.”

Cable and Connectors

This category includes coaxial cable and fiber, with most DAS utilizing ½” coax and Single Mode Fiber. Dubbed the “Long Stuff” due to their lengthy nature.

Antennas

Essential for any DAS setup, aptly referred to as the “Ants.”

Jumpers and Couplers

Comprising shorter cables (2-6 ft) and various couplers such as 2-way, 3-way, or 4-way combiners. Known as the “Small Stuff.”

Support Structure

This encompasses items carrying or supporting the heavy, long, and small components, including 19” racks, ladder racks, mounts, brackets, and cable management systems.

Grounding

Grounding wire and bus bars are vital for protecting devices from electrical surges. Installers ensure all grounding components tie into the building’s existing system for safety.

Installation of Coaxial and Fiber Cable

• Pulling cables onto support structures like cable trays or j-hooks.
• Connecting coaxial cables using specialized tools.
• Terminating or connecting fiber cables within fiber housings through fusion splicing.

Mounting Electronics and Antennas

• Mounting antennas before cable installation to guide cable termination.
• Electronics can be rack-mounted, placed on H-Frames, or mounted on walls.

Grounding, Labeling, and Powering Up

• Grounding all electronics, outdoor cables, and support structures to protect against electrical surges.
• Thorough labeling of all components for easy identification and maintenance.
• Powering up the system, with power distribution often involving rectifiers, DC power distributors, and battery plants for backup power.

Making Interconnections

• Establish connections between devices or electronics using short cables or jumpers, including coax and fiber.

Cable Testing

• Conducting tests to identify faults, ensure signal continuity, minimize signal loss, and reduce interference.
• For coaxial cables, tests include sweep and PIM tests, while fiber cables undergo OTDR and Optical Loss tests.

Location

The facilities’ location, such as the city or town, can influence costs due to variations in labor rates, permit fees, local regulations, and availability of resources.

Travel Distance

The distance required for technicians and equipment to travel to the installation site can impact costs due to transportation expenses and the time needed for installation.

Building Size

The size of the building affects the scale of the DAS installation. Larger buildings will always require more antennas, cables, and equipment, resulting in higher costs. Besides the obvious need for more antennas and cables, more infrastructure components are needed to support those antennas and cables for every 250,000 sq ft of your building, spiking costs for every 250,000 sq ft area.

Types of Walls

The type of wall impacts signal strength attenuation. Signals passing through concrete walls experience more signal loss compared to drywall. Consequently, buildings with predominantly concrete walls require more antennas than those with primarily drywall, despite having similar sizes.

Number of Inside Walls

More interior walls impede signal propagation, necessitating additional antennas for adequate coverage. In scenarios where two floors have similar areas, the floor with a denser wall layout will require more antennas, consequently leading to a higher budget allocation.

Internal Wall Make-up

The composition of internal walls, such as concrete, metal, or thick barriers, can affect the signal propagation and coverage within the building. Special considerations or modifications may be necessary, leading to increased costs.

Parking Situation

The availability and accessibility of parking for installation vehicles and equipment can affect costs, especially in congested urban areas or locations with limited parking options.

Building Type and Internal RF Environment

Different building types, such as residential, commercial, or industrial, may have unique RF challenges and infrastructure requirements. Complex internal RF environments, such as buildings with dense structures or high interference, may require additional equipment and customization, impacting costs.

Rooftop RF Environment

The RF environment on the rooftop, including existing antennas, nearby interference sources, or line-of-sight challenges, can impact the design and installation of the DAS. Mitigation measures or customized solutions may be necessary, impacting costs.

Penetration Requirements

If the DAS requires penetrations through walls, ceilings, or roofs for antenna placement or cable routing, additional labor, materials, and potential structural modifications may be required, affecting costs.

Ceiling Type

Different ceiling types, such as drop or high ceilings, can impact installation and accessibility. Specialized equipment or installation techniques may be needed, influencing costs.

Roof-Mount Type

If the DAS antennas are roof-mounted, the type of roof structure and mounting method can affect costs. Additional reinforcement, engineering analysis, or specialized equipment may be required.

Coverage Area

The number of antennas required typically scales with the area to be covered. As the coverage area increases, so does the need for more antennas. However, the exact quantity of antennas is determined through meticulous engineering analysis.

Existing System Or Cabling

If an existing system or cabling is in place, the infrastructure’s compatibility, condition, and reusability can influence costs. Upgrades or integration with the current system may be required, impacting overall expenses.

Cabling Ease And Difficulties

The ease or difficulty of running cables throughout the building can impact costs. Complex installations involving intricate pathways, tight spaces, or extensive retrofitting may require additional labor and materials. If your facility already has infrastructure that allows for additional cabling, costs are lower; if your building was constructed without future infrastructure in mind, costs will be higher. Future-proofing buildings at the time of construction is the best way to keep costs low for future technology upgrades.

Signals Coming in from Outside

In Carrier-grade DAS installations, engineers evaluate the extent of outside signals infiltrating indoor spaces. Mobile Network Operators prefer DAS signals to dominate over outside signals by a factor of 4 to 10 times. Strong outside signals necessitate more antennas to mitigate interference, resulting in higher DAS costs. Additionally, factors such as cable routing, work hours, and work restrictions can influence pricing, making it challenging to provide a standard per square footage cost.

Signal Frequencies

Signal frequencies vary in their travel distances; lower frequencies tend to cover longer distances compared to higher frequencies. Common public safety bands include VHF, UHF, and the 700 & 800 bands. However, a neutral host DAS in the U.S. typically encompasses a broader spectrum, covering bands such as 700, 800, 1900, 2100, 2300, and 2500. Consequently, a public safety DAS often requires fewer antennas compared to a neutral host cellular DAS due to differing frequency needs.

The highest frequencies often pose challenges in DAS design. For instance, while a public safety DAS may be designed for an 800 MHz signal, a neutral host DAS may necessitate accommodating a 2500 MHz signal, which travels shorter distances. This results in a denser antenna deployment for neutral host DAS, thus requiring a larger budget.

Cable Tray Availability

The availability and accessibility of cable trays for routing and organizing cables can affect the ease of installation. The need for additional cable tray installation or modifications can impact costs.

Conduit Requirements

Conduits may be necessary for cable management and protection, depending on local regulations and building codes. The need to install or modify conduits can contribute to installation costs.

Active Component Power Requirements

Active components of the DAS, such as amplifiers and signal boosters, may have specific power requirements. Ensuring sufficient power supply and infrastructure to support these components may add to the overall costs.

Available Power Outlets

The availability of power outlets near the DAS equipment locations can impact installation costs. If power outlets are insufficient or need to be installed, additional electrical work or wiring may be necessary.