MEDIATEK MT7921K Wireless LAN Driver Installation Guide
- June 6, 2024
- Mediatek
Table of Contents
MEDIATEK MT7921K Wireless LAN Driver
System Overview
General Description
MT7921K chip is highly integrated single chip which have built in 2×2 dual-
band wireless LAN and Bluetooth combo radio. WiFi works on the ISM band, which
means many other devices such as microwave oven, radar, and Bluetooth use the
same frequencies and channels with WiFi devices.
Therefore, governments make regulations to avoid interference between devices.
The specifications include usable channels, scan rule, and transmit power.
Driver Install
How to Install Driver
Please follow the procedure listed in below to install driver:
- 1st: Update Windows security package to register signature mechanism
- 2nd: Install Windows driver.
Windows Security for new signature mechanism
If you are the 1st time to use this driver, you should update Windows
Security for new signature mechanism at first. Please follow below link to
install this software.
https://www.microsoft.com/en-us/download/details.aspx?id=46148
For windows 7 x64 example:
Windows 10 install note
If manufacturer can’t install the driver in Windows 10 due to driver
integrity check, try to disable the integrity check to allow installation.
- Disable Driver Integrity Check
1. Open cmd as Administrator.
2. Execute ‘bcdedit /set nointegritychecks on’
3. Reboot
4. Then install again. If still fail, try do ‘Disable Secure Boot’ below. NOTE: Re-enable the driver integrity check by executing ‘bcdedit /set nointegritychecks off’ and then rebooting.
- Disable Secure Boot
Please refer to:
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop /disabling-secure-boot
Install Windows driver
MT7921K supports PCIE interface. According to interface type of MT7921K,
please refer to steps shown below to install Windows driver:
PCIE interface:
-
Connect DUT to PC/NB and check Windows Device Manager.
-
Window Device Manager would discover DUT shows “Generic Bluetooth Adapter”(BT device) and “WiFi_If”(Wi-Fi device).
-
Right click the “Generic Bluetooth Adapter” BT device and select disable as follows.
-
Right-click on “WiFi_If” Wi-Fi device and Update Driver Software.
-
According host’s Windows’ OS to select and install driver.
General Information & Integration Instructions
General Description of MT7921K
| Product | 2TX 11ax (WiFi6E) + BT/BLE Combo Card |
|---|---|
| Brand | MediaTek |
| Model | MT7921K |
| Power Supply Rating | 3.3Vdc from host equipment |
| Modulation Type | GFSK, π/4-DQPSK, 8DPSK for FHSS CCK, DQPSK, DBPSK for |
DSSS
64QAM, 16QAM, QPSK, BPSK for OFDM
256QAM for OFDM in 11ac mode and VHT20/40 in 2.4GHz 1024QAM for OFDMA in 11ax
HE mode
Modulation Technology| BT EDR: FHSS
BT LE: GFSK
WLAN: DSSS, OFDM, OFDMA
Transfer Rate| BT EDR: up to 3 Mbps
BT LE: up to 2 Mbps 802.11b: up to 11 Mbps 802.11a/g: up to 54 Mbps
802.11n: up to 300 Mbps
802.11ac: up to 866.7 Mbps 802.11ax: up to 1201.0 Mbps
Operating Frequency| BT EDR: 2402MHz ~ 2480MHz
BT LE 1M: 2402MHz ~ 2480MHz
BT LE 2M: 2404MHz ~ 2478MHz
2.4GHz: 2.412 ~ 2.472GHz
5GHz: 5.18~5.32GHz, 5.50~5.72GHz, 5.745 ~ 5.825GHz
6GHz: 5.955 ~ 6.415GHz, 6.435 ~ 6.525GHz, 6.525 ~ 6.875GHz, 6.875 ~
7.115GHz
Number of Channel| BT EDR: 79
BT LE: 40
2.4GHz:
802.11b, 802.11g, 802.11n (HT20), VHT20, 802.11ax (HE20): 13
802.11n (HT40), VHT40, 802.11ax (HE40): 9
5GHz:
802.11a, 802.11n (HT20), 802.11ac (VHT20), 802.11ax (HE20): 25
802.11n (HT40), 802.11ac (VHT40), 802.11ax (HE40): 12
802.11ac (VHT80), 802.11ax (HE80): 6
6GHz:
802.11ax (HE20): 59
802.11ax (HE40): 29
802.11ax (HE80): 14
Host Integration Instructions
The product is designed to be used with “NGFF (Next Generation Form Factor) M.2 2230” PCIE Bus, please install module into a M.2 2230 PCIE slot.
Host Product Testing Guidance
HOST must follow the specific restrictions listed in “Regulatory notes” section below and section 3 of KDB996369 D04 V02 Module Integration Guide v01, to verify that the host product meets all the applicable rules.
Regulatory Notes
Federal Communication Commission Interference Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: Any changes or modifications not expressly approved by the
party responsible for compliance could void the user’s authority to operate
this equipment.
This transmitter must not be co-located or operating in conjunction with any
other antenna or transmitter.
This device meets all the other requirements specified in Part 15E, Section
15.407 of the FCC Rules.
Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed and operated with
minimum distance 20cm between the radiator & your body.
This module is intended for OEM integrators only. Per FCC KDB 996369 D03 OEM
Manual v01 guidance, the following conditions must be strictly followed when
using this certified module:
KDB 996369 D03 OEM Manual v01 rule sections:
List of applicable FCC rules
This module has been tested for compliance to FCC Part 15 Subpart C (15.247)
and Subpart E (15.407). Device is tested for compliance as a low power indoor
client device within 5.925–7.125 GHz band.
Summarize the specific operational use conditions
The module is tested for standalone mobile RF exposure use condition. Any
other usage conditions such as co-location with other transmitter(s) will need
a separate reassessment through a class II permissive change application or
new certification.
This module is authorized for Low Power Indoor Client applications only; final
host product must be for indoor operations only.
Further operation restrictions on the host product include:
*Prohibited for control of or Communications with unmanned aircraft systems.
Limited module procedures
Not applicable.
Trace antenna designs
Not applicable.
RF Exposure Considerations
This equipment complies with FCC mobile radiation exposure limits set forth
for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20cm between the radiator & your body. A
separate SAR/Power Density evaluation is required to confirm compliance with
relevant FCC portable RF exposure rules.
Label and compliance information
The final end product must be labeled in a visible area with the following:
“Contains FCC ID: RAS-MT7921K”. The grantee’s FCC ID can be used only when all
FCC compliance requirements are met.
Information on test modes and additional testing requirements
This transmitter is tested in a standalone mobile RF exposure condition and
any co-located or simultaneous transmission with other transmitter(s) class II
permissive change re-evaluation or new certification.
Additional testing, Part 15 Subpart B disclaimer
This transmitter module is tested as a subsystem and its certification does
not cover the FCC Part 15 Subpart B (unintentional radiator) rule requirement
applicable to the final host. The final host will still need to be reassessed
for compliance to this portion of rule requirements if applicable.
As long as all conditions above are met, further transmitter test will not be
required. However, the OEM integrator is still responsible for testing their
end-product for any additional compliance requirements required with this
module installed.
IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.
Manual Information To the End User
The OEM integrator has to be aware not to provide information to the end user
regarding how to install or remove this RF module in the user’s manual of the
end product which integrates this module.
The end user manual shall include all required regulatory information/warning
as show in this manual.
OEM/Host Manufacturer Responsibilities
OEM/Host manufacturers are ultimately responsible for the compliance of the
Host and Module. The final product must be reassessed against all the
essential requirements of the FCC rule such as FCC Part 15 Subpart B before it
can be placed on the US market. This includes reassessing the transmitter
module for compliance with the Radio and EMF essential requirements of the FCC
rules. This module must not be incorporated into any other device or system
without retesting for compliance as multi-radio and combined equipment.