Apple TV (2nd generation) - Manual (Page 9)

Chapter 1 Connect. 9 Chapter 1 Connect.
IR receiver
Use with the included Apple Remote to control Apple TV.
Status light
The status light flashes slowly when Apple TV starts up. When Apple TV is on,
the status light glows. See “Status Light” on page 31.
d Micro USB port
For service and diagnostics.
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Power port
Connect the included AC power cord to the power port on Apple TV.
G Ethernet port
If your network is Ethernet-based, connect an Ethernet cable.
£ HDMI port
Connect Apple TV to the HDMI port of a high-definition TV using an HDMI cable.
Optical digital audio port
Connect Apple TV to a home theater receiver that has an optical digital audio port,
using an optical digital audio (also called S/PDIF or TOSLINK) cable.
Z
Built-in 802.11n Wi-Fi technology
Connect Apple TV to your wireless network.