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Number of fronthaul optical modules in one base station

ODN and passive infrastructure knowledge brief Published 19 Aug 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

A typical 5G base station uses approximately 12 fronthaul optical modules, up from 6 in 4G deployments.Overview

In modern 5G networks, fronthaul optical modules connect the Baseband Unit (BBU) or Centralized Unit (CU) to Remote Radio Units (RRUs) or Active Antenna Units (AAUs). These modules are essential for transmitting high-bandwidth, uncompressed RF signals over fiber, enabling low-latency and high-speed connectivity .

Module Types and Configurations
  • 25G SFP28 Optical Modules: The standard for 5G fronthaul, supporting both dual-fiber gray optics and single-fiber bidirectional (BiDi) transmission at 25.78 Gbps .
  • CWDM Modules: Coarse Wavelength Division Multiplexing modules are used to maximize fiber utilization, especially in dense CRAN deployments .
  • Single-Fiber BiDi Modules: Reduce fiber usage while maintaining high-precision time synchronization, supporting distances up to 20 km .
Module Count per Base Station
  • 4G Base Stations: Typically used 6 optical modules for fronthaul connections.
  • 5G Base Stations: The number has increased to 12 optical modules due to higher bandwidth requirements and more complex antenna configurations .
  • CRAN Deployments: In centralized RAN architectures, the number of modules may vary depending on the number of RRUs/AAUs connected and the use of WDM technology to multiplex multiple channels over a single fiber .
Future Trends

With the evolution toward 50G and beyond for post-5G networks, the number of optical modules per base station may increase further, and higher-speed duplex and BiDi modules are being standardized to support next-generation fronthaul requirements . In summary, a typical 5G base station currently requires around 12 fronthaul optical modules, reflecting the increased data rates, multiple antenna elements, and advanced fronthaul architectures compared to 4G networks.

Number of fronthaul optical modules in one base station - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Number of fronthaul optical modules in one base station

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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