Horizontal fiber optic switches require careful configuration of interface attributes, pin assignments, optical characteristics, and operational parameters to ensure reliable performance.

Key Configuration Parameters

1. Optical Characteristics

• Insertion Loss: Typical values for EOL series switches are around 0.15 dB at 1.55 µm and 1.31 µm, with maximum losses increasing at shorter wavelengths (e.g., 0.60 dB at 0.46 µm) .
• Back Reflection: High optical isolation is critical; EOL switches achieve <-65 dB at 1.55 µm .
• Crosstalk: Crosstalk is minimized to <-55 dB to prevent signal interference between channels . 2. Interface and Port Configuration
• Serial and Parallel Interfaces: Switches provide C-compatible I/O pins for serial communication, including transmitter, receiver, and clock pins. Some pins may be unused and should not be connected to ground or voltage .
• I²C Addressing: Each switch can be assigned a unique I²C address (e.g., “1” for EOL 1x2, “2” for EOL 2x2) to enable proper control and monitoring .
• Interface Split (for high-bandwidth switches): On devices like Huawei CX320, a 40GE interface can be split into four 10GE interfaces using the port split command. Converted interfaces are numbered sequentially (e.g., 40GE1/20/1:1 to 40GE1/20/1:4) and retain service configurations after switch replacement . 3. Operational Parameters
• Switching Cycles and Repeatability: EOL switches are rated for 5000 cycles at 1 Hz with repeatability in the range of 0.002–0.005, ensuring consistent performance .
• Thermal Characteristics: Switches operate reliably across a defined temperature range, with performance curves provided in the manufacturer's datasheet .
• Offline and Online States: Split interfaces initially go offline after configuration and become active after a switch restart, ensuring service continuity . 4. Logical and Fabric Configuration
• For Fibre Channel switches, logical switch creation, port assignment, and fabric parameter settings are essential. Parameters like zero-based addressing are recommended for FICON operation, while BB_Credit settings are managed separately . 5. Safety and Handling
• Avoid bending optical fibers below a 35 mm radius to prevent damage.
• Do not pull or stress fibers excessively, as this can degrade optical performance .

Summary

Configuring a horizontal fiber optic switch involves setting optical parameters (insertion loss, back reflection, crosstalk), interface attributes (serial/parallel pins, I²C addresses, port splitting), and operational parameters (switching cycles, online/offline states). Proper handling and adherence to manufacturer guidelines ensure reliable performance and longevity of the optical network.