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Which side should optical modules B and C be placed on

Fiber and communications infrastructure knowledge brief Published 28 May 2024

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Optical module B should be placed on the side where the fiber positions are reversed (key-up connectors on both ends), and module C should be placed on the side where the pair-flipped trunk cable is used, maintaining the same patch cord orientation at both ends.

Understanding Module Placement

Module B (Type B / Method B)Type B cables are reversed cables with key-up connectors on both ends. Fiber positions are inverted: position 1 on one end connects to position 12 on the other, position 2 to 11, and so on. Module B should be installed on the side where the cassettes or adapters are flipped to maintain correct Tx/Rx alignment.

This method allows the use of the same patch cord type at both ends, simplifying deployment in high-speed parallel optics like 40G/100G. Module C (Type C / Method C)Type C cables implement a pair-flipped configuration inside the trunk cable rather than in the patch cord. Fiber pairs are flipped within the cable, so the patch cords on both ends remain the same.

Module C should be placed on the side where the Type C array cord connects to the Type A adapters, ensuring the crossover occurs inside the trunk cable rather than in the patch cords. This method also allows the use of identical patch cords at both ends, similar to Method B, but the flipping is handled differently.

Key Considerations

Key Orientation: Ensure that the MPO connectors' key orientation (key-up or key-down) matches the requirements of the chosen method. Type B uses key-up on both ends, while Type C uses key-up/key-down with pair flipping inside the cable. Patch Cords: Use standard duplex patch cords (A-to-A or A-to-B) according to the method.

Method B and C allow the same patch cord type at both ends, reducing complexity.

Tx/

Rx Alignment: Correct placement ensures that the transmit (Tx) port of one device connects to the receive (Rx) port of the other, maintaining proper polarity across the link. By following these guidelines, module B is installed where fiber inversion occurs, and module C is installed where pair flipping is implemented, ensuring seamless high-speed data transmission and compliance with TIA-568 standards.

Which side should optical modules B and C be placed on - BAGYOU FIBRE NETWORKS [PDF]

Which side should optical modules B and C be placed on

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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