Thor 1-4 HDMI to ATSC Modulators 8VSB - Manual (Page 13)

H-4HDMI-ATSC-IP
3.2 Initial Status
After powering on the device，it will take a few seconds to initialize the system
 ATSC: indicates the modulation standard of this device: ATSC.
Start up… Start OK…
ATSC A XXX.00MHz
P1:X.XXMbps P2: X.XXMbps