WiFi Module 5BK

WIFI Module #5BK uses the same chipset (Realtek RTL8821CU) as WIFI Module #5B, so it is 100% compatible. IEEE 802.11ac/a/b/g/n WLAN and Bluetooth combo module with on-board 2.4Ghz and 5.8Ghz Dual band antenna.

Only one minor difference from the previous 5B model is that doesn’t have a CD-ROM mode. So, we can skip  the usb-modeswitch tweak.

Works with ODROID series, Compatible with Android and Linux. (Please update your OS to the latest version if it doesn’t work.)

– Realtek RTL8821CU chipset ( USB ID = 0BDA:C820, No CDROM mode )
– Dual-Band 11ac 1×1 with 64/128/152 bit WEP, WPA/WPA-PSK,WPA2/WPA2-PSK securities
– Frequency Range: 2.4-2.483GHz ; 5.725~5.825GHz
– Support WLAN Standards: IEEE802.11ac/a/b/g/n
– Transfer Speed : ~200 Mbps
– Support Bluetooth 2.1/3.0/4.2
– USB 2.0 High-Speed host interface
– Antenna Gain: 2dBi
– Dimension : 28 x 16 x 7 mm
– LED for WiFi Link Activity
– Frequency Range: 2.4-2.483GHz ; 5.725~5.825GHz
– Weight : 5 g

WiKi Page

Note that WiFi Module 5BK is an OEM model of CF-813B.

Experimental test with N2+ USB port.

Equipments for test
ODROID-N2+ with Ubuntu 20.04.2, updates as Feb-2021.

Test envierenmant
Server – x86 HOST PC
Client – ODROID Boards
Test utility – iperf
Wireless router(AP) – ipTIME A2008
Test Block Diagram
ODROID ↔ Wireless ↔ AP ↔ Ethernet ↔ PC

Equipment was kept 1.5 meters apart during all tests, no obstructions.
Software used: iperf version 2.0.13 (21 Jan 2019) pthreads

5GHz

(1) Channel Connection Statistics
[ 5GHz ] IEEE802.11AC
Channel : 161 (5.805 GHz)
Signal : -34 dBm
Rate : 434 Mbps
Power Save : Note Enabled (Off)

(2) 5GHz Download : 225 Mbps
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-60.0 sec 1.57 GBytes 225 Mbits/sec

(3) 5GHz Upload : 238 Mbps
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-60.1 sec 1.67 GBytes 238 Mbits/sec

(4) 5Ghz Duplex
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-30.0 sec 893 MBytes 250 Mbits/sec
[ 4] 0.0-30.1 sec 169 MBytes 47.2 Mbits/sec

2.4GHz

(1) Channel Connection Statistics
[ 2.4Hz ] IEEE802.11bgn
Channel : 5 (2.432 GHz)
Signal : -45 dBm
Rate : 150 Mbps
Power Save : Note Enabled (Off)

(2) 2.4GHz Download : 81.2 Mbps
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-60.2 sec 583 MBytes 81.2 Mbits/sec

(3) 2.4GHz Upload : 53.7 Mbps
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-60.1 sec 384 MBytes 53.7 Mbits/sec

(4) 2.4GHz Duplex
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-30.0 sec 360 MBytes 101 Mbits/sec
[ 4] 0.0-30.1 sec 83.6 MBytes 23.3 Mbits/sec