[ewg] FW: Groups - 2011-10-QSFP-Memory Map Validation-v6.xlsx uploaded

[Rupert Dance]

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 at 01CC7D5C.1404BDA0

Description: cid:image001.png at 01CC7D5B.D41DF210

 

Thanks

 

Rupert

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