Charged particles are identified in ALICE by Time-Of-Flight (TOF). TOF measurements yield the velocity of a charged particle by measuring the flight time over a given distance along the track trajectory. Using the tracking information from other detectors every track firing a sensor is identified. Provided the momentum is also known, the mass of the particle can then be derived from these measurements. The ALICE TOF detector is a large-area detector based on multigap resistive plate chambers (MRPCs) that cover a cylindrical surface of 141 m2, with an inner radius of . There are approximately 160 000 MRPC pads with time resolution of about 100 ps distributed over the large surface of 150 m2.