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I have a SFP compatible module which has an I2C interface. I understand that SFP is a pseudo-standard but I can't find any documentation on the I2C interface and what registers in the EEPROM do what.

My goal is to just reset the SFP over I2C and read back any error messages that I might have access to.

Product in question: https://www.fs.com/products/12626.html

Similar unanswered question: Open Switch (OPX): Accessing SFP EEPROMs via I2C on a Dell S4112F-ON

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  • Do you understand that an EEPROM is read-only? That is what the RO stands for. With the proper equipment, you could erase it and rewrite it, but in your device, the data in it does not change.
    – Ron Maupin
    Commented Jan 20, 2022 at 21:37
  • In any case, your question is probably better suited for Electrical Engineering.
    – Ron Maupin
    Commented Jan 20, 2022 at 21:38
  • Hi Ron, I will re-post in EE. Thank you for your feedback.
    – CakeMaster
    Commented Jan 20, 2022 at 21:54
  • Electrically Erasable PROGRAMMABLE Read Only Memory. 9 times out of 10, the SFP EEPROM is rewritable. (I've yet to encounter one that write-protected)
    – Ricky
    Commented Jan 21, 2022 at 7:45
  • The document you seek is SFF-8472. There's no error log in the SFP. (DOM can show current signal levels.)
    – Ricky
    Commented Jan 21, 2022 at 7:45

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