Distributed Antenna System
(DAS) Design
Passive and active DAS design for 4G LTE, 5G NR and multi-operator indoor cellular coverage — shopping malls, airports, hospitals, stadiums, tunnels and commercial buildings with public safety ERRCS/BDA design.
What We Offer
Modern buildings — with their concrete cores, metal cladding and deep floor plates — block outdoor cellular signals, creating indoor coverage dead zones that frustrate users and impair business operations. A Distributed Antenna System (DAS) solves this by distributing indoor antenna nodes connected to a central signal source throughout the building, providing consistent indoor cellular coverage on all mobile networks and frequency bands.
ASDV Consultant designs both passive DAS (coaxial splitter/combiner systems for smaller buildings) and active DAS (fibre-connected remote units for large deployments) for 4G LTE, 5G NR (sub-6GHz and mmWave), multi-operator sharing and public safety frequencies. We also design Emergency Responder Radio Communication Systems (ERRCS) and Bi-Directional Amplifier (BDA) systems required by NBC India fire code for first responder communications in large buildings.
Our DAS designs include detailed RF link budgets, antenna placement, cable routing, head-end equipment specifications and operator coordination documentation — providing everything needed to obtain operator approval and construct the system.
Why Choose ASDV?
- Certified ELV design consultants with 10+ years experience
- AutoCAD & Revit BIM deliverables for seamless coordination
- Full compliance with Indian & international standards
- Transparent pricing with detailed BOQ and specifications
- Pan-India service with international project capability
Design Deliverables
Antenna Placement Drawings
Floor plans showing antenna positions, cable routes, splitter/combiner locations and head-end room layout.
RF Link Budget
Signal level calculations from head-end to each antenna, verifying coverage at -85 dBm or better across all frequency bands.
System Architecture
Head-end equipment topology, antenna distribution tree and operator interface configuration.
Bill of Quantities
Itemised coaxial cable, antennas, splitters, combiners, amplifiers and active DAS hardware.
Technical Specifications
Equipment specifications for antennas, coaxial cable, connectors, amplifiers and active DAS remote units.
Operator Coordination Package
Operator-ready design documentation for MNO approval and signal source agreement.
What's Included
Our Design Process
Coverage Requirement Analysis
Define coverage target areas, frequency bands, operator requirements and public safety frequency needs.
RF Propagation Assessment
Assess building construction, penetration losses and existing outdoor signal levels to determine DAS scope.
System Type Selection
Select passive DAS (buildings < 50,000 sqm) or active DAS (large buildings, stadiums) based on scale and performance requirements.
Antenna Placement & Link Budget
Design antenna layout and calculate RF link budget to verify -85 dBm or better coverage at every antenna location.
Head-End & Cable Design
Specify head-end equipment, cable types, routing, splitter tree and rack layout.
Operator Documentation
Prepare operator coordination package for MNO approval, BDA permit applications and commissioning documentation.
Standards & Codes We Design To
Frequently Asked Questions
Passive DAS distributes cellular signals using coaxial cables, splitters, combiners and passive antennas — no active electronics in the distribution network. It is suitable for buildings up to ~50,000 sqm and supports multiple frequency bands simultaneously. Active DAS uses fibre optic cables to connect a central head-end to remote antenna units (RAUs) which contain amplifiers — enabling coverage over very large buildings (airports, stadiums, multi-building campuses) with lower signal loss over distance.
ERRCS (also called In-Building Public Safety DAS or BDA system) ensures that police, fire and emergency responders can communicate via their radio systems inside buildings. NBC India 2016 and many local fire codes require ERRCS in large buildings above a specified size or height. The system consists of a Bi-Directional Amplifier (BDA) connected to the public safety radio system, distributing the signal via indoor antennas.
A multi-operator DAS combines signals from multiple mobile network operators (Jio, Airtel, Vi, BSNL) through a combiner into a single shared antenna distribution network. Each operator connects their signal source (repeater, small cell or fibre from the BTS/BBU) to the head-end combining equipment. All operators share the same indoor antenna infrastructure, reducing costs and simplifying installation compared to each operator deploying a separate system.
Need a DAS Design for Your Building?
Contact ASDV Consultant for a complete 4G/5G DAS design with RF link budget, antenna layout and operator documentation.