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Base station radio frequency unit optical cable model

Fiber optic adapter knowledge brief Published 24 Jan 2021

Prepared for preliminary research by the DANI ALONSO OPTICAL knowledge desk. Confirm connector interfaces, sleeve materials, polish, loss budgets and installation requirements against current standards and product documentation.

RRU optical cables, such as Type II stranded fiber cables, connect the Remote Radio Unit (RRU) to the Baseband Unit (BBU) in 4G and 5G base stations, supporting high-speed, low-loss transmission in outdoor environments.Overview of RRU and BBU

The Radio Remote Unit (RRU) is the outdoor radio frequency (RF) component of a base station, responsible for transmitting and receiving signals to and from user equipment (UE) like mobile phones, while the Baseband Unit (BBU) handles baseband processing, control, and network interfacing . In modern distributed base station architectures, the RRU is mounted near the antenna at the top of the tower, and the BBU is located at the base or indoors. The RRU connects to the BBU via optical fiber, forming a high-speed, bi-directional link that reduces signal loss compared to traditional coaxial connections .

Optical Cable Models for RRURRU Remote Optical Cable Type II
  • Construction: Stranded 2 or 4 simplex optical fibers, protected by a UV-resistant LSZH (Low Smoke Zero Halogen) outer jacket .
  • Standards Compliance: Meets YD/T 2289.1-2011 for Remote Radio Unit optical cables .
  • Performance: Supports high bandwidth with low attenuation and dispersion, immune to electromagnetic interference (EMI), .
  • Durability: UV-stabilized, flame-retardant, and resistant to extreme weather conditions, suitable for outdoor deployment .
  • Applications: Horizontal and vertical cabling between BBU and RRU, including Fiber to the Antenna (FTTA) for 4G and 5G networks .
  • Handling: Flexible and easy to terminate, allowing efficient connectorization in base station installations .
RRU Optical Fiber Cable (General)
  • Construction: Uses 2.0 mm simplex fibers stranded with filling cords, jacketed with LSZH polyolefin for flame retardancy .
  • Use Case: Designed for both horizontal and vertical wiring in wireless base stations, connecting BBUs to RRUs .
  • Environmental Suitability: Engineered for outdoor ruggedized links, ensuring reliability in harsh climates .
Key Considerations
  • Distance and Signal Loss: Optical fiber minimizes RF signal loss over long distances between BBU and RRU.
  • Network Upgrade Flexibility: Using optical links allows easier upgrades to new equipment and higher frequency bands.
  • Safety and Compliance: LSZH jackets reduce smoke and toxic emissions in case of fire, meeting international safety standards . In summary, RRU optical cables, particularly Type II stranded fiber cables, are essential for connecting RRUs to BBUs in modern cellular networks, providing high-speed, low-loss, and durable links suitable for 4G and 5G base station deployments .

Base station radio frequency unit optical cable model - DANI ALONSO OPTICAL CONNECTIVITY [PDF]

Base station radio frequency unit optical cable model

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Technical note

This reference is intended for preliminary fiber optic adapter research. Compatibility, link budgets, connector interfaces, sleeve materials, polish, installation methods, test limits and applicable standards must be verified for the specific project.

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