Status of CMS Electromagnetic Calorimeter

The CMS electromagnetic calorimeter will provide excellent performances (energy and position measurements) in a very hard environment (radiation, beam crossing rates). It consists of a barrel made of 61200 lead tungstate crystals readout by two avalanche photodiodes and of two endcaps with 14488 crystals readout by vacuum phototriodes. Early 2002, the front-end electronics has been redesigned and is now based on trigger towers that provide the trigger primitives at each bunch crossing and transmit raw data upon level-1 trigger acceptance. The status of the calorimeter construction will be presented, as well as results of beam tests performed in 2003 using this new electronics scheme, which confirm that the design performance can be reached.