Know Issues for tracker readout channels

Layer 5 (cable 3, GTRC 1)

Channels 640 - 959 are noisy. There are all connected to the third ladder in the layer. Usually the threshold for these channels is set to 60, twice as high as the nominal threshold (30). Because of the large threshold the occupancy is typically lower then the one for the neighbouring ladders.

Layer 12 (cable 0, gtrc 3)

Chan 128 - 191 (one GTFE chip) are very inefficient. It looks like that a wire bond is broken (?).