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.