Documentation for 5G Values?

I was wondering if there is any documentation on the values for cell and unit in the download file, specifically for the 5G (NR) entries. What values area actually being reported in these fields (ie. LocalCellID, NRCellID, something else)? I’ve seen the table on the wiki, but it doesn’t breakdown the values according to the different technologies.

I have noticed that currently about 25% of the entries with a radio value of “NR” have a cell value of 2147483647. This is fairly suspicious since that is the largest positive value for a 32-bit signed integer, and usually indicates that a system has attempted to store a larger integer into a 32-bit variable. There are also a number of other values in the cell column which are much higher (12 digits) than even the max value for a 36-bit integer (which is what the NRCellID should be).

I am curious if these are just artifacts of providers doing testing, or if there is some other type of value that is being put into the cell column.

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Also how to differentiate between 5G NSA (ie voice channel is LTE, data channel NR) and 5G SA (both voice and data channels are NR).