The 5500 never had powerlink and to make matters worse the lineout was redirected and sourced from the output amplifier and attenuated as opposed to the 5000 that was sourced from the pre-out stage. Not sure why they made this move as it would have been better to drive the newly released penta via line level rather than speaker level. I suspect the real reason would be that the line level would have sounded better than speakerlink which they needed for data and links... I don't know can't see it being a technical reason tbh!
Sorry about the 5500 - I only have a 5000 and a 6500 system -so I assumed that the 5500 had powerlink too 😳
My B&O Icons: