Sony HT-S100F Operating Instructions Manual page 9

Rear
 AC IN terminal
 HDMI OUT (TV (ARC)) jack
Connect a TV that has an HDMI
input jack with an HDMI cable.
The system is compatible with
Audio Return Channel (ARC). ARC
is the function that sends TV
sound to an AV device such as the
system from the TV's HDMI jack.

(USB) port (page 16)
 TV IN (OPTICAL) jack
 IR repeater (page 14)
Transmits the remote signal of
the TV remote control to the TV.
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