Hi All,
I have been working with a cable vendor that has questioned Byte 188-189 for Active Fiber Cables. He feels that this field should only be required for Optical Transceivers. Therefore he feels for direct attached fiber optic cables (which is 95% of what we see) the value in this field should or could be zero. I have discussed this with Tom Palkert and we feel the description in SFF8436 provides the best guidance. We have decided to allow zero but I will also not fail the AOC if it is programmed with a reasonable non-zero value. 7.6.2.20 Wavelength Tolerance (Address 188-189) The guaranteed +/- range of transmitter output wavelength under all normal operating conditions. For direct attach cable assemblies the value is zero. 16 bit value with byte 188 as high order byte and byte 189 as low order byte. The laser wavelength is equal to the 16 bit integer value divided by 200 in nm (units of 0.005nm). Thus, the following two examples: It also seems to be somewhat in conflict with the table which indicates that it is required for both AOC and Optical Module Description: cid:image002.png@01CC7D5C.1404BDA0 Description: cid:image001.png@01CC7D5B.D41DF210 Thanks Rupert
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