Wi-Fi specifications for Apple TV
Wi-Fi specification details for Apple TV devices are in the appendixes for Apple TV. The categories are:
802.11 compatibility and frequency band: 802.11ac (Wi-Fi 5), 802.11n (Wi-Fi 4), 802.11a, 802.11b/g and 2.4 GHz or 5 GHz.
Physical layer (PHY) data rate: The highest rate at which a client can transmit data over Wi-Fi.
Channel bandwidth: The maximum channel bandwidth that is supported. Beginning with 802.11n, channels can be combined to create a wider channel that allows for more data to be transmitted during a single transmission. With 802.11n for 5 GHz band, two 20 MHz channels can be combined to create a 40 MHz channel. With 802.11ac for 5 GHz band, four 20 MHz channels can be combined to create an 80 MHz channel.
MCS index: The Modulation and Coding Scheme (MCS) index defines the maximum transmission rate at which 802.11ac/n devices can communicate. 802.11ac uses Very High Throughput (VHT) and 802.11n uses High Throughput (HT) packets.
Spatial streams: Each radio can send a specific number of independent data streams, called spatial streams, at the same time, which can increase overall throughput.
Ethernet: The connection speed of the built-in Ethernet port. The Apple TV 3rd generation Rev A and the Apple TV HD have 100 MBs Ethernet connections and the Apple TV 4k has a 1 GB Ethernet connection.