fix(sfp): fix rx power conversion #479
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closes sonic-net#449 Signed-off-by: Wataru Ishida <wataru.ishid@gmail.com>
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JaapKeuter
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Jul 14, 2024
| coeff = self.float_from_bytes(eeprom_data[off:off+size]) | ||
| result += coeff * rx_pwr_ad ** i | ||
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| result = result * 0.0001 # uW to mW |
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Here the comment should make it clear that the result value is in 0.1 uW units, not uW (the formula in the documentation at section 9.3 is also misleading in that regards). Otherwise the conversion factor may be interpreted off by an order of magnitude by an unsuspecting reader.
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Description
fixes how to calculate the rx power when the external calibration is used according to the SFF-8472 Rev 12.4 section 9.3.
Motivation and Context
fixes #449
How Has This Been Tested?
No. Asking the original reporter of this bug to test this as I don't have access to a real device that uses this feature
Additional Information (Optional)