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Digital Diagnostic Monitoring Interface for XFP Optical Transceivers

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Digital Diagnostic Monitoring Interface for XFP Optical Transceivers

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This Application Note defines Finisar implementation of the XFP 2-wire serial interface, 3 which is used for serial ID, digital diagnostics, and certain control functions. The 2-wire 4 serial interface is mandatory for all XFP modules and it is defined in the XFP MSA 5 Specification Rev 4.5. It is modeled largely after the digital diagnostics monitoring 6 interface proposed for the SFP and GBIC optical transceivers and defined in the SFF 7 draft document SFF-8472 Rev 10.1, which in turn is an extension of the original serial 8 ID systems defined for the GBIC and SFP transceivers. One major difference, however, 9 is that the memory structure is changed to use a single 2-wire interface address.

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