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PL Tone stands for Private Line Tone, DPL is Digital Private Line. It is a sub-frequency that filters out other radio user's transmissions on the same frequency in the area.
You can and should still "monitor" the frequency first before transmitting of the channel. Think of it like the old "Party Line" telephones, (if you are old enough to remember), where you had to listen to the line first to make sure you neighbor was not using the line, before you could use it.