M-DOTS Optical Remote Units – ORUs

Helios® Multi-Band Digital Optical Transport System (M-DOTS™) is the most flexible, scalable and complete solution for addressing coverage and capacity needs for cellular and public safety wireless network. The M-DOTS™ improves wireless network coverage and capacity by extending services from existing cell sites, to hard-to-reach areas by digital CPRI distributing coverage from a centralized radio suite.

Utilizing a centralized digital CPRI distributed architecture, Helios® M-DOTS™ is a two-tier architecture consisting of the Optical Master Units (OMUs) and Optical Remote Units (ORUs). RF signals from Base Stations, off-air, BDAs or combination thereof can be received. In the case of off-air feed, the OMU has the option to combine the functions of the off-air Repeater and OMU to provide transmission and distribution of radio signals. The signal is filtered and then converted to a digital CPRI data stream. The digital CPRI packet data stream is transported via single mode fiber and received by the ORUs. The ORUs then convert the digital CPRI packet data stream back to RF and amplify the signal for delivery to the antennas. On the reverse path (uplink), the ORUs and OMU perform the inverse functions and delivery the signals back to the corresponding off-air antenna, BDAs or Base Stations.

The all-digital platform with ultra-wide bandwidth RF front-end design and modular architecture enables multiple band/technologies/operator and network topologies including star, chain and hybrid to cater to different deployment scenarios. These network topologies provide reduced fiber plant usage and installation cost, and effective fiber loop redundancy configurations.

The M-DOTS™ flexibility and scalability offers service provider an optimal solution for multiple applications, such as dense urban centers, dense suburban areas, campuses, enterprise buildings, subways and tunnels. The M-DOTS™ digital CPRI distributed architecture and small form factor allow service providers to cost-effectively increase coverage and capacity in these hard-to-reach areas.

  • Flexible & scalable architecture by modular design
  • Full digital software and hardware platform with Ultra-wide RF front-end design and enables multiple bands/technologies/operators and MIMO, even ultra-wide bandwidth requirement for future 5G NR
  • Supports up to six RF bands and up to 100MHz bandwidth RF signals per bands
  • Each RF bands can be configurated to be FDD or TDD mode in factory and supports synchronization for TDD-LTE multi-Channel
  • RF composite DL Output power up to +43dBm per Band
  • Digital optical path fault auto-detection
  • RJ-45 Port for Local Control and Alarming on an IP Web Browser GUI
  • Unique compact IP-67 rated ORU design with max 250mm depth for pole and wall mounted
  • Compatible with HELIOS® DTFMS™ Radiating Cable Distance-to-Fault Measure System (Option)

Electrical Specification

Frequency Range:Band 5: 824-844 MHz / 869-889 MHz; Band 8: 890-915MHz / 935-960MHz; Band 3: 1710-1785MHz / 1805-1880MHz; Band 1: 1920-1980MHz / 2110-2170MHz; Band 40: 2300-2400MHz; Band 41: 2500-2600MHz

Output Power per Band: 43±2dBm

Gain: UL: 40±3dB    DL: 45±3dB

Max Input Power without Damage: UL: ≤-10dBm

Spectrum Analysis: Built-in downlink output spectrum analysis

Power Supply: 220V AC (Dual redundant power supply support)

External and Antenna Connection

Connector: RF: N-Type Female; Optical: LC

Local Alarm Indications: LED alarm display

Mechanical Specification

IP Rating/Cooling: IP-67 and cooling with Fan

Temperature Range: -25℃ to +55℃

Relative Humidity: Max 95%