Just wondering if anyone has used an ABB branching unit (NDBU-85C) to link multiple drives. I was hoping to monitor multiple drives on one workspace using drive window using one of these units, When I have 1 pair of fibre optic cables plugged in it works fine but when another is added from an additional drive the signals appear choppy with spikes. I have it set up physically correct as I have seen it in other areas but I am unsure if I have missed any settings off that is preventing me from monitoring more than 1 drive effectively. Any help cheers? 