Tenda A27 User Manual

Version1.0
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10.2 OFDMA
Before 802.11ax, Orthogonal Frequency Division Multiplexing (OFDM), a modulation mode is used
for data transmission. OFDM divide the whole channel into several sub-channels (sub-carriers),
and transmit data through these sub-channels, differentiating different data. At some point, data
sent by users will occupy the whole channel. If several users need to use OFDM to send data, they
can only wait in line, wasting channel resources.
802.11ax introduced more efficient data transmission mode, Orthogonal Frequency Division
Multiple Access (OFDMA), a multi-address access technology. It uses OFDM to divide the whole
channel to into several sub-channels (sub-carriers), with user data borne on resource blocks rather
than in the whole channel, thereby allowing parallel user data transmission at the same time. It is
unnecessary for users to wait in line, thus decreasing time delay and improving users’ internet
experience.
OFDM data transmission mode:
OFDMA data transmission mode:
WiFi extender
Channel 1
Channel 2
Channel 3
Sub-channel
Sub-channel
Sub-channel
Sub-channel
Sub-channel
Sub-channel
Sub-channel
Sub-channel
Sub-channel
User 1: Web page
User 2: Video
User 3: Message
WiFi extender
Sub-channel
Sub-channel
Sub-channel
User 3: Message
User 2: Video
User 1: Web page
Channel X

Tenda A27 Specifications

General

Ethernet LAN	Yes
Cabling technology	10/100/1000Base-T(X)
Networking standards	IEEE 802.11ax
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Antennas quantity	2
Antenna gain level (max)	5 dBi
DC input voltage	12 V
DC output current	1 A
Power source type	DC
Power consumption (max)	11 W
Wi-Fi band	Dual-band (2.4 GHz / 5 GHz)
Frequency band	2.412-2.484, 5.15-5.25, 5.725-5.85 GHz
Output power (dBm)	2.4GHz (2412 MHz~2472 MHz):19.97dBm 5GHz (5150 MHz~5250 MHz; 5250 MHz~5350 MHz; 5470 MHz~5725 MHz):22.99dBm
Top Wi-Fi standard	Wi-Fi 6E (802.11ax)
Receiver sensitivity	2.4 GHz 11b-1M:-97dBm 11g-54M:-76dBm 11n-20M-MCS7:-74dBm 11n-40M-MCS7:-72dBm 5 GHz: 11a-6M:-95dBm 11n-20M-MCS7:-74dBm 11n-40M-MCS7:-72dBm 11ac-80M-MCS9:-63dBm
WLAN data transfer rate (max)	1800 Mbit/s
Security algorithms	WPA-PSK, WPA-TKIP, WPA2-PSK, WPA3
Product type	Network repeater
Product color	White
Quantity per pack	1 pc(s)
Connectivity technology	Wired & Wireless
Ethernet LAN (RJ-45) ports	1
Certification	CE, FCC、RoHS
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 90 %
Operating relative humidity (H-H)	10 - 90 %
Harmonized System (HS) code	85176990

Weight and Dimensions

Depth	72 mm
Width	123 mm
Height	47.5 mm