The ALCT board receives at 40 MHz anode signals from a Cathode Strip Chamber (CSC) and attempts to find hit patterns in the six - layer chamber using a multiple - layer coincidence timing technique, and then to identify the location and quality of the best two muon track stubs transiting the chamber.

A single ALCT board can accept all of the signals from an entire CSC.

There are 3 versions of the ALCT, having either 288, 384 or 672 channels that correspond to different CSC sizes.

Results from the muon pattern-finder logic are formatted into Local-Charged-Track data frames for each muon found. LCT frames are transmitted to the Trigger Mother Board (TMB) by 80 MHz data transfer interface.