You may refer to page 128 of 710 series datasheet for reference:
As extracted here
"Typical SFP+ modules provide software or hardware control of TX_Disable and Rate Select (RS0/RS1) inputs. If software control
is used, the TX_Disable and RS0/RS1 bits can be accessed through the I2C interface. If hardware control is used for rate
selection, inputs RS0 and RS1 are tied together and connected to the same SDP output"
Hope this information help.
Right. So there is no hardware control for TX_DISABLE of SFPs on XL710 and software control is the only option. That is bad as soft TX_DISABLE is an optional one.
Thanks for checking.