Thor 1- 4 HDMI to QAM Modulators - Manual (Page 9)

H-4SDI-or-4HDMI-QAM-IP
⑦ Menu button: for back step
⑧ Lock button: press to lock set
Rear Panel Illustration
① SDI(HDMI) Module 1: SDI input port 1&2
② SDI(HDMI) Module 2: SDI input port 3&4
③ RF in port (for combiner use)
④ RF out port
⑤ ASI input port
⑥ ASI output ports
⑦ Switch
⑧ Power supply slot
⑨ Grounding
4 Channel HDMI Version pictured below