What is the "NF" option?

Upon request we provide a special modification to the LED blinking behaviour of the 7054-based isolator. That is, swapping the "high-speed" indication by the "failure" indication.
As result, the isolator LEDs will not blink when in high speed mode but are constantly on.
You may request this version by writing "NF-option" in the paypal payment process or as an email afterwards.

Update: as of 2016-06-01, the NF option has been merged to the standard firmware. The isolator will show the connection state by blinking accordingly. After three seconds, both LEDs will be constantly on. This can be seen as a "locked" state.
With other words: all currently sold units have the NF-option on by default.