Full Crate Test of The CMS Regional Calorimeter Trigger

The CMS regional calorimeter trigger system detects signatures of electrons/photons, t-leptons, jets, and missing and total transverse energy in a deadtimeless pipelined architecture. It consists of 18 crates containing Receiver Cards with four-gigabit copper cable receiver/deserializers on mezzanine cards. The Receiver Cards deskew, linearize, sum and transmit data on a 160 MHz backplane to Electron Isolation cards that identify electrons and a Jet/Summary card that sums energies. Most processing is done on five highspeed custom ASICs. A clock and control card choreographs the system timing. We present results from testing a completely instrumented and fully functional pre-production crate.