In NR total 13 PRACH formats divided into long & short preambles.
Long preambles have a sequence of length LRA=839, short have a sequence of length LRA=139.
For Long preambles format 0,1,2,3 used, in Short preambles format A1, A2, A3, B1, B2, B3, B4, C0, C2, including mixed formats A1/B1, A2/B2, and A3/B3 used.
Subcarrier spacing supported for Long preambles are 1.25 & 5 khz, whereas for Short preambles supported 15,30,60,120 khz.
Long preambles used for FR1 ,short preambles used for both FR1 & FR2.