TCISL FUP is "applicable to all existing and future unlimited plans", so that means folks on prepaid time-based plans with NU add-on are not affected. Supposedly.
I think a nice way to frame this issue and compare the various ISPs is to calculate the maximum data that can be downloaded on a given connection and then present the Fair Usage Limit as a percentage of that, e.g.
for 256 kbps; average case scenario :
256kbps *
0.9 (average due to TRAI latitude of 20% in speed) *
0.9(TCP overhead) *
3600(hour) *
24(day) *
30(month)
/ 8bits / 1024kB =
65610 MB.
So, 45000 MB represents a limit of 68.6%. Not ideal, but could be worse.
for 384kbps; limit is 71.1%
for 512kbps; limit is 60.9%
for 1024kbps; limit is 34.3%
for 2048kbps; limit is 20.0%
for 4096kbps; limit is 11.9%