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How many pigtails are needed for 3 RRUs and 1 BBU

You will need 3 pigtails—one for each RRU connecting to the BBU.

Each Remote Radio Unit (RRU) requires a dedicated fiber optic connection to the Baseband Unit (BBU) using a CPRI link, which is typically implemented via a pigtail or optical jumper cable . Therefore, for 3 RRUs, you will need 3 pigtails to connect them to a single BBU.

Additional Considerations

  • Fiber Type and Connectors: The pigtails are usually pre-terminated with Duplex LC connectors to match the RRU and BBU ports, ensuring quick and reliable connections .
  • Distance and Loss: Keep the fiber runs as short as possible to minimize signal loss. Modern single-mode fibers typically have around 0.25 dB loss per kilometer, but poor installation can increase this loss .
  • Installation Environment: Pigtails should be protected from harsh environmental conditions using IP67/68-rated adaptors and dust caps, especially for outdoor RRUs .
  • Future Expansion: If you plan to add more RRUs or upgrade to multi-band configurations, consider installing additional pigtails or using hybrid cables that can support multiple RRUs from a single BBU . In summary, for 3 RRUs connected to 1 BBU, 3 pigtails are required, with one dedicated fiber connection per RRU. Proper planning of fiber routing, connector type, and environmental protection will ensure reliable network performance.

How many pigtails are needed for 3 RRUs and 1 BBU - Kili Optical & Telecom Technologies [PDF]

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