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General Description:
It is prohibitively expensive to provide to send every LCT that can potentially be found to the counting room. Thus a Muon Port Card (MPC) is used to reduce the data. Each MPC receives the LCTs from all of the CLCT/TMB cards in one sector of one endcap muon station, selects the three ‘best’ LCTs, and sends them over optical fiber links to the CSC Track Finder electronics located in the CMS counting room.
In each of stations 2, 3, and 4, an MPC receives signals from 9 chambers corresponding to 60 degrees in phi in one station: three inner 20-degree chambers and six outer 10-degree chambers. In station 1, an MPC receives signals from 8 chambers corresponding to 20 degrees in phi: two 10 degree chambers in each of four types, the inner and outer sections of ME1/1 plus ME1/2 and ME1/3.
Each MPC in stations 2, 3, and 4 reduces the number of LCTs to three or less and sends them to the Sector Receiver (SR) module via optical links. In station 1, the number of output LCTs is two or less.