Modem categories

Could somebody please tell me where I can find the different modem categories specifications, cat 6, cat 12 etc… with their respective speeds etc…
Couldn’t find the info anywhere.
Thanks

Here:
http://www.techplayon.com/3gpp-release-15-ue-category-types-throughput-performance-modulation-and-supported-ue-dl-ul-combinations/

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