VHF Simplex Digital CPRI Optical Transport System - Optical Remote Units (ORUs)

As a common transportation, Railways transportation increases the carrying capacity, shortens the transportation time and decreases the transportation cost which improve the quality of transportation services, yield greater customer satisfaction, and help to create the socioeconomically balanced societies. And this highly efficient transport mode creates significant challenges in terms of investment, technology, industry, and environment.

Railway radio communication which offering voice or data services needed for daily operation. Various radio communication system/technology have been used for many years for railway operational applications, such as analog radio, digital radio, TETRA, GSM-R, LTE-R are used for railway communication. Radio communication networks are critical to train operations including stringent requirements for reliability, availability, safety and security for these operations.

HELIOS® VHF Band Simplex Digital Optical Transport System is designed to extend the railway coverage of VHF Simplex Based communication.

Utilizing a centralized digital CPRI distributed architecture, HELIOS® VHF Band Simplex Digital Optical Transport System is a two-tier architecture consisting of the Optical Master Units (OMUs) and Optical Remote Units (ORUs). RF signals from Base Stations, off-air, can be received. 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, or radiating cable.

The whole system 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.

  • ALL Digital Software and Hardware Platform
  • CPRI Transport between OMU’s and ORU’s
  • VHF Simplex communication support
  • Supports 4 Digital Optical Output Ports for each OMU
  • Supports up to 8 Remote Units cascading in each optical port
  • One OMU support up to 32 Remote Units connection
  • Single Fiber core to transport
  • Supports up to 10 Gb/s Digital Optical Fiber Speed
  • Loop redundancy support
  • Option embedded optical bypass module for non-loop redundancy architecture
  • Long transport distance and accurate delay calibration
  • RF composite DL output power +27dBm
  • IP67 and wall mount or pole mount of ORU
  • 19” standard Rack case design of OMU
  • RJ-45 Port in OMU to support Local Control and Alarming via web browser GUI
  • Additional RJ-45 Port for external ethernet and wireless modem
  • SNMP V3 and MIB File

Electrical Specification

Frequency Range (Customized):146.400MHz; 147.975MHz; 159.700MHz; 160.400MHz; 160.550MHz; 161.150MHz

; 162.100MHz

Downlink Composite Output Power: 27±2dBm

Gain: Max. 50dB

Gain Adjustment: 25dB in 1 dB steps

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

Group Delay: <36µs exclude fiber delay

IMD 3: -36dBc

Spurious:≤-36dBm@9KHz~1GHz; ≤-30dBm@1GHz~12.75GHz

VSWR: <1.5

Alarm Detection: PA Fault alarm, Optical Transceiver Link alarm, Downlink output over power alarm, Door open alarm and etc.

I/O Impedance: 50 ohm

MTBF: 80,000 Hours

Power Supply: 220V AC 50~60Hz

Power Consumption: Max. 200W

External and  Connection

Local Alarm Indications: LED alarm display

RF Connector: 1 * N-Type Female

Optical Connector: 2* LC / UPC

Mechanical Specification

IP Rating: IP67

Temperature Range: -25℃ to +55℃

Relative Humidity: Max 95%

Dimension: 499*399*225mm

Weight: Max 34kg