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Connect two optical modules to the internal network switch

ODN and passive infrastructure knowledge brief Published 03 Sep 2022

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.

To connect two optical modules to a network switch, use compatible SFP/SFP+ modules with duplex fiber cables, ensuring proper mode, wavelength, and port alignment.Step 1: Select Compatible SFP Modules

Choose SFP or SFP+ transceiver modules that match the fiber type (single-mode or multimode) and network speed (1G, 10G, or higher) of your switch . Ensure both modules are compatible in terms of:

  • Fiber mode: single-mode (OS2) or multimode (OM3/OM4)
  • Wavelength: e.g., 850nm for multimode, 1310nm or 1550nm for single-mode
  • Port rate and duplex mode: both modules should support the same speed and full/half duplex
Step 2: Prepare Duplex Fiber Cabling

Most SFP modules require duplex fiber cables with LC connectors . You can use:

  • Pre-terminated fiber patch cords with LC connectors
  • Direct attach cables with SFP ends for short distances
  • Ensure the fiber strands are reversed between ports (TX of module A to RX of module B and vice versa) to allow proper signal transmission
Step 3: Install the Modules
  1. Insert the SFP modules into the switch's SFP/SFP+ slots, following ESD precautions .
  2. Remove dust plugs from the fiber connectors only when ready to connect.
  3. Ensure the modules are fully seated and secured, tightening any jackscrews if applicable .
Step 4: Connect the Fiber Cables
  • Connect the duplex fiber cable between the two SFP modules, ensuring TX/RX alignment is correct .
  • For BiDi SFP modules, a single fiber strand can be used, but ensure the modules are matched for bidirectional operation .
Step 5: Verify the Connection
  • Check the switch interface status to confirm the link is active.
  • Ensure the optical power levels and sensitivity are within the supported range for both modules .
  • Test network connectivity and throughput to confirm proper operation.
Additional Considerations
  • Distance: Use multimode fiber for runs under 1000 feet and single-mode fiber for longer distances .
  • Topology: For multiple switches, consider star or daisy-chain topologies to optimize performance .
  • Cascading switches: Limit cascades to a practical number of layers (typically no more than four) to maintain performance . By following these steps, you can reliably connect two optical modules to your internal network switch, ensuring high-speed, stable fiber-optic communication.

Connect two optical modules to the internal network switch - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

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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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