9k20f1d

Ok, I seem to have run into something I can't find. There is a new paging channel for Centre County 460.6125 that has emissions of 11K0F3E, 9K20F1D. I know that 11K0F3E is NFM...but what is 9K20F1D is for??? I see it says Zentron based alpha-numeric paging. Does that mean this frequency is...