For 1080i, Frame Rate (25 fps) is different from Field Rate (50Hz).
In interlaced video (e.g. 1080i), each Frame is split into 2 Fields: one Field consists of odd lines; another Field consists of even lines.
The correct labelling is 1080i/50 (there is no such thing of 1080i/25).
But this is talking about the input signal only. For flat panel display (LCD & plasma), the entire frame (i.e. all 1920x1080 pixels) is displayed at once. There is no such thing as "1080i" output mode. Output is always in progressive mode.
Zappiti Pro 4K HDR Media Player
Pioneer UDP-LX500
Pioneer SC-LX901
JVC DLA-N5
JL Audio E110
PS Audio Power Plant P10