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Americas Issue: June 2007
Seeking Robust GPON Interoperability
by David Cleary
Let’s face it, standards rank right up there with motherhood and apple pie as things people generally favor. The primary reason we have standards—in any industry—is so multiple suppliers can develop independently products that will work together.
That way, service providers can purchase best-of-breed products for different parts of their networks and know they will snap together like Legos. Achieving this result requires a step beyond the definition of standards: It requires a robust, scalable interoperability regime.
The fiber-access industry learned that lesson the hard way with BPON (broadband passive optical network) standards. While a great deal of worthwhile work was done, BPON interoperability did not fully realize the Lego blocks goal.
Instead of full interoperability, the results were more limited. Discrete pairs of BPON suppliers interoperated, but often they required customized software loads for each OLT (optical line terminal)/ONT (optical network terminal) pairing. Figure 1 illustrates the cost and complexity associated with this approach.
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