sentences:  Proper levels for tone remote systems are 0dbm for the high level tone, -10dbm for the function tone and -30dbm for the low level guard tone (Motorola's older manuals often confused technicians with some levels listed as high as +14dbm.Analog telephone circuits used by tone remote systems normally only allow 0dbm as a maximum) All levels are based on 600 ohm impedance termination at the radio itself and needed gain after a long circuit to bring the levels back up to the levels noted above.Level discipline varies from one system to another.