Distributed Antenna System


Distributed Antenna System

Distributed Antenna System

Passive and Active DAS solutions 

DAS solutions comes in a wide variety of technologies, shapes and sizes since the result has to accommodate the specific requirements of the needs. One obvious differentiation is where the DAS is located.

Indoor DAS (iDAS) installations are deployed within buildings and other structures, while outdoor DAS (oDAS) provides coverage out in the open air. A variant of iDAS, the most common DAS deployments, refers specifically to DAS installations in facilities with either a lot of space, a lot of people, or both.

EMTS DAS systems are broadband in nature and cover the frequency ranges from FM through to 2.7GHz. Our DAS can provides a combined DAS solution including public safety and cellular bands in one OMU (Optical Master Unit) or in one Fiber Remote Unit (FRU) This enables network operators, enterprises or public safety authorities to operate one.

integrated DAS with a mixture of different remotes locations & technologies including VHF, UHF, GSM, WCDMA (3G), LTE (4G) or GSM-R thus providing coverage for a variety of services throughout the environment. An integrated DAS architecture reduces both initial deployment and ongoing operational costs.

EMTS DAS systems are easily configured either locally or remotely via a simple GUI interface or using the advanced NMS system. Multiple types of wireless modems are supported.

Passive DAS

Passive DAS systems take the RF signals transmitted from the source or the antennas and carry them over standard RF coaxial cable (coax). Since the signals are not modified in any way, the components involved (diplexers, duplexers, splitters, combiners, tappers, and so on) are relatively simple, inexpensive and they do not require power or other connections.
On the flip side, however, every length of cable and every component in the path reduces the strength of the radio signal and the size of the system is limited by the maximum distance the signal can travel before it becomes too weak to be useful.
As a consequence, passive DAS is best suited for relatively small indoor applications. As such, EMTS can supply high-end components features low RF loss thus resulting in higher efficiency of the passive DAS system.


Active DAS

Active systems, on the other hand, convert the radio signals into a digital format that is carried over optical fiber. The RRF signals are converted to optical signals which can be carried over essentially unlimited distances, but the components (the master unit, expansion units and remote units) can be expensive and require both power and control interfaces.
In addition, the conversion process often adds significant delay to the system, which must be compensated for in the DAS design. Active DAS is used in outdoor deployments and in larger indoor installations.
EMTS can deliver high-end active DAS components, featuring high gain & low RF loss components ensuring high efficiency radio coverage.


Active or passive, indoors or outdoors, operator-owned or neutral host, DAS provides the means to connect users to their services and content in locations that would otherwise experience poor performance, or no access whatsoever.
By allowing the RF signals to be placed exactly where they’re needed, without the need to install new base stations or eNodeB's at each spot, DAS can meet the needs of the subscribers more effectively than other, more traditional solutions.


The system is built out of three main components: POI (Point of Interface), the OMU (Optical Master Unit) and the FRU (Fiber Remote Unit). EMTS can provide high-end solutions of any of the system components to ensure high performance of your fiber DAS system.

Point of Interconnect (POI)

The POI is a 19” mounted or outdoor unit combining/splitting unit used for cross coupling the RF signals between the Base-Stations and the FBR’s. It provides a high level of flexibility for multiplexing the signals in the network and eliminate the need of many cables interconnections which are done internally in the POI.

Optical Master Unit (OMU)

The OMU is a wideband optical converter unit used for converting RF signals into optical signals. It consists of an optical interface with a transmitter and receiver. A subcarrier is used for communication with the Remote Units. 


The FRU is a wideband remote radio-head designed for modularity and high performance. It is the end unit in the system and connects directly to the antenna system. The FRU includes   amplification modules in a multiple output levels and multiple combinations of multiple frequency bands, Filtering modules and optical to RF, RF to Optical converters.

Cellular Fiber Distribution Antenna System (DAS)

Cellular Fiber Distribution Antenna System (DAS)
  • Advanced Tri-Band, Dual Band or Single Band system supporting all wireless air protocols includes GSM, WCDMA 3G, LTE 4G, WiMAX operating from 450MHz, LTE 800MHz , SMR and Cellular 850MHz , 900MHz, PDC 1400MHz, AWS 1700MHz , DCS 1800MHz, PCS1900 MHz, UMTS2100MHz, and LTE 2600MHz.
  • Supports multi-band, multi-operators and multi-technologies applications.
  • Comply with ETSI, 3GPP and LTE 4G standards
  • 40dBm Downlink power per band, designed for in building or outdoor deployments
  • Easy field installation and maintenance, reduces rollout and operational costs
  • Advance monitoring systems with the possibility to send alarms via fiber cable from master to slave or via GSM modem.                                  
  • Four (4) Remote units per master unit, designed to connect to POI (Point of Interconnection) to support multi-operator deployments.
  • Compact Size in IP65 enclosure (Aluminum-alloy).

900MHz Fiber Optic Repeater System


850-1700-1900MHz 40dBm Tri-Band Fiber Optic Repeater System

900-1800-2100MHz 40dBm Tri-Band Fiber Optic Repeater System

In Builiding DAS - Poinit Of Interface unit (POI)

In Builiding DAS - Poinit Of Interface unit (POI)
  • US and EU types.
  • High Performance and high reliability with up to 16 inputs (4 per band) combined  into up to 4 outputs.
  • Very cost effective antenna sharing solution for Indoor/Outdoor applications
  • High power BTS conditioning 150 watts per port.
  • Very Low Passive Inter-Modulation (PIM),
  • Extremely low Insertion loss.
  • DAS vendor neutral, support duplexed and non-duplexed signal and uplink diversity
  • Programmable Dynamic DL Power Control
  • Optional for Built-in Power meters to monitor input and output power.
  • Optional for remote and local configuration, management and monitoring of alarms
  • Plug-and-play configuration, Indoor, outdoor or 19-inch Rack types.

Point of Interface POI 700-2700 MHz US type


Point of Interface POI_800-2700 MHz EU Type

Public Safety Fiber Distribution Antenna System (DAS)


TETRA 400MHz High Power Fiber Optic Repeating System


TETRA 800MHz 10W Digital Fiber Optic Repeater System 



LMR 400MHz High Power Fiber BDA System

DFBDA-850-40W55 R1

SMR 850MHz 10W Digital Fiber Optical Repeater System


  • Fiber Optic RF Repeater is a reliable solution to extend and improve the coverage area of GSM-R network
  • Consists of two main modules, Master and multiple Slave units.
  • 33, 37, 40 or 43dBm composite output power, meet systems standards
  • Easy field installation and maintenance reduces rollout and operational costs
  • The signal transmission in fiber optic repeater is not disturbed by outside influences
  • Provide very quick RF coverage service to your GSM-R Base-Station
  • Compact Size and High Performance in waterproof enclosure suitable for outdoor and indoor installations
  • Remote unit design for wall mounting &Base unit design for 19-inch rack

GSM-R 900MHz Digital Fiber Optical Repeater