Each one of the national and international ramps has service to the aircraft, which will be selected through a frequency of the ADF radio selecctor. The understood ranges are from the 201.X to the 224.X where 201.X make reference to the Gate 1, 202.X at the 2 and this way up to the 224.X at the 24. The frequency 200.X move away the ramp service, to proceed behind with the march without obstacles.