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524 WIFI6 2T2R DUAL BANDS DUAL CONCURRENT MPCIE CARD IEEE802.11AX / AC / A / B / G / N 2.4G / 5GHZ MT7915 + MT7975 – DRIVER 7915 NPD PRO+ WIFI 6 MODULE

MT7915+MT7975 Chipset2.4GHz max 23dBm & 5GHz max 20dBm output powerIEEE 802.11ac / ax compliant & backward compatible with 802.11ax/ac/a/b/g/n

2×2 2.4G & 2×2 5G  MIMO Technology, up to 1.8Gbps Mini PCI Express edge connector

SupporttheFrequency2412MHz~2482MHz

SupporttheFrequency5180MHz~5825MHz

RoHS compliance ensure a high level protection of human health and the environment from risks that can be posed by chemicals

Supports Spatial Multiplexing,Cyclic-Delay Diversity (CDD), Low-Density Parity Check  (LDPC) Codes,Maximal Ratio Combining (MRC), Space Time Block Code (STBC)

Supports IEEE 802.11d, e, h, i, k, r, v time stamp, and w standards , WPA3 supported in latest OpenWRT.

Supports Dynamic Frequency Selection (DFS)

Cards are individually calibrated for QualityAssurance  Industrial working temperature range up to +70C ! Tested !  Comes with integrated heatsink 2,5mm and  with Pro+ Industrial grade extended temperature range and better radio signal parameters

Introduction

DR7915 is a WiFi6 Mini PCIe Module 2T2R based on Mediatek MT7915DAN which is a WiFi Mini PCIe single chip which supports 1800 (573+1201) Mbps PHY rate with PCIe2.1. It fully complies with IEEE 802.11ax/ac and IEEE 802.11 ac/a/b/g/n standards, offering feature-rich wireless connectivity at high standards, and delivering reliable, cost-effective throughput from an extended distance.

DR7915-NPD is 2 RF outputs for 2.4GHz, the other 2 RF outputs for 5GHz, and we combine 1×2.4GHz and 1x5GHz to be 1 antenna outputs and dual bands. So there are 2 antennas RF outputs with dual bands. In Linux “ifconfig” command, you can see two radios, ra0 and rai0, means you can have two radios in the meantime and dual bands dual concurrents with HW AP mode that can serve for 100+ concurrent clients connected at same time.

Optimized RF architecture and base band algorithms provide superb performance and low power consumption. Intelligent MAC design deploys a high efficient offload engine and hardware data processing accelerators which completely offloads Wi-Fi task of the host processor. MT7915DAN is designed to support standard based features in the areas of security, quality of service and international regulations, giving end users the greatest performance any time and in any circumstance.

MT7915DAN is designed to support high data throughput over WiFi. The host interface PCIe are integrated to provide stable bandwidth between the host platform and MT7915DAN.

Deep sleep mode:

Multiple power domains are implement on chip. In deep sleep mode, the PMU could be configured in a low power state to save the power consumption.

Two CPU systems: There are both 32-bits RISC MCU subsystem. The CPU has its local memory. There are several options of clock frequency to provide the optimal performance with the best power consumption. The 32-bit RISC MCU is used to do clocck control, power management, and host interface configuration. PDMA (packet DMA) engines are integrated to support on-the-fly data buffer management.

MT7915AN had the WiFi MAC and BBP subsystem and use with MT7975DN together, which provide the best-in-class radio and low power performance. And the Wi-Fi MAC and BBP subsystem and use with MT7975DN together, which provide the best-in-class radio and low power performance.

With the advent of 802.11ax/ac, multi-user MIMO (MU-MIMO) is defined. MT7915DAN supports MU-MIMO with different configurations.

MT7915DAN BLOCK DIAGRAM

MT7915DAN 11ax WiFi6 2T2R DBDC 1800Mbps block compact diagram

FEATURES:

  • 2T2R in 2.4G+2T2R in 5G with support of up to 573+1201Mbps PHY rate
  • Supports 20, 40, 80 channels
  • HE MCS0-11 BW20/40/80MHz with Nss=1~2
  • Short Guard Interval
  • Space-time block code (STBC)
  • Low Density Partiy check (LDPC)
  • Support digital pre-distortion to enhance PA performance
  • Smoothing (channel estimation) extension to MIMO case
  • DFS radar detection
  • Embedded ARM Cortex R4 processor for full host CPU offload
  • Embedded 32-bit RISC microprocessor
  • Support STBC, LDPC, TX Beamformer and RX Beamformee
    Decoded BW20/40/80 up to 4×2 MU materix feedback
  • Greenfield, mixed mode, legacy modes support
  • Highly integrated RF with 40nm low power process
  • Noise mitigation:
    • Supports background scan function for fast channel switching
    • Supports spectrum analysis for non-Wi-Fi signals
  • Intelligent power saving
  • WFA WMM, WMM PS (QoS)
  • Integrate high efficiency internal 4G/5G PAs
  • Intelligent Calibration (iCal) reduces the production time
  • Integrate high efficiency internal 4G/5G PAs

SPECIFICATION:

Symbol Parameter
Chipset MT7915+MT7975 
Host Interface Mini PCI Express 2.1
Antenna Connector 2 x UF.L , the third (left) uf.l connector is for BT, not used now, for future use (BT is in the chipset)
Frequency Range 2.4GHz: 2.412GHz to 2.472GHz
5GHz: 5.180GHz to 5.825GHz
Operating Voltage 3.3V DC
Power Consumption Power consumption maximum is 9W, average is 4 – 8W
Main board Power Supply design please provide 3.3V 3A, minimum 3.3V 2.5A.
Modulation Techniques OFDM: BPSK, QPSK, DBPSK, DQPSK, 16-QAM, 64-QAM, 256-QAM
Environmental Temperature Operating: -40°C to 70°C, Storage: -40°C to 90°C
Environmental Humidity, non-condensing Operating: 5% to 95%, Storage: Max. 90%
ROHS Compliance YES
Dimensions (W×H×D) 51mm × 30mm × 5.9mm including heatsing on bottom side

 

 RF Performance Table

 

 

Operating Mode Data Rate TX Power Tolerance
1 Chain 2 Chains
2.4 GHz

802.11b

11Mbps 20dBm 23dBm ±2dB
2.4 GHz

802.11g

54Mbps 17dBm 20dBm ±2dB
2.4 GHz

802.11n HT20

MCS7 17dBm 20dBm ±2dB
2.4 GHz

802.11n HT40

MCS7 14dBm 17dBm ±2dB

 

 

Operating Mode Data Rate RX Sensitivity Tolerance
2.4 GHz

802.11b

11Mbps -96dBm ±2dB
2.4 GHz

802.11g

54Mbps -93dBm ±2dB
2.4 GHz

802.11n HT20

MCS7 -89dBm ±2dB
2.4 GHz

802.11n HT40

MCS7 -86dBm ±2dB

 

 

 

Operating Mode

 

Data Rate

TXPower   

Tolerance

1 Chain 2 Chain
   5 GHz

802.11a

54Mbps 17dBm 20dBm ±2dB
   5 GHz

802.11n/ac HT20

 

MCS8 15dBm 20dBm ±2dB
  5 GHz

802.11n/ac HT40

 

MCS9 14dBm 17dBm ±2dB
  5 GHz

802.11n/ac HT80

 

MCS9 11.5dBm 14.5dBm ±2dB
  5 GHz

802.11n/ac HT20

 

MCS9 17dBm 20dBm ±2dB
  5 GHz

802.11n/ac HT40

 

MCS9 14dBm 17dBm ±2dB
  5 GHz

802.11n/ac HT80

 

MCS11 11dBm 14dBm ±2dB

 

 

 

 

 

 

 

Operating Mode Data Rate RX Sensitivity Tolerance
5 GHz

802.11a

54Mbps -80dBm ±2dB
5 GHz

802.11n/ac HT20

MCS8 -71dBm ±2dB
5 GHz

802.11n/ac HT40

MCS9 -68dBm ±2dB
5 GHz

802.11n/ac HT80

 MCS9 -65dBm ±2dB
5 GHz

802.11n/ac HT20

 MCS9 -61dBm ±2dB
5 GHz

802.11n/ac HT40

 MCS9  -58dBm ±2dB
5 GHz

802.11n/ac HT80

 MCS11 -55dBm ±2dB

 

 

 MiniPCIe Slot Pin Assignment

 

TOP Side Bottom Side
1 PCIE_WAKE_L 2 VCC_3V3
3 BT_PCM_DO 4 GND
5 BT_PCM_DI 6 BT_PCM_CLK
7 PCIE_CLKREQ_L 8 BT_PCM_SYNC
9 GND 10 PTA_TX
11 PCIE_REFCLK_N 12 BT_RTS
13 PCIE_REFCLK_P 14 BT_CTS
15 GND 16 PTA_RX
Mechanical key
17 NC 18 GND
19 NC 20 WIFI_EN
21 GND 22 PCIE_RST_L
23 PCIE_TX_N 24 VCC_3V3
25 PCIE_TX_P 26 GND
27 GND 28 BT_RX
29 GND 30 PTA_WLAN_ACT
31 PCIE_RX_P 32 PTA_ZB_PRI
33 PCIE_RX_N 34 GND
35 GND 36 LED_WPS
37 GND 38 LED_BT
39 VCC_3V3
(RESERVED)
40 GND
41 VCC_3V3
(RESERVED)
42 PTA_ZB_ACT
43 GND 44 LED_WIFI_2.4G
45 LED_WIFI5 46 NC
47 NC 48 NC
49 NC 50 GND
51 BT_EN 52 VCC_3V3

DR7915 can work on OpenWrt 21.02 version OS directly, no need to install the driver to support this MTK chipset.

Please check if you are able to itegrate drivers in to your system. Please check with below link to download 11ax driver.

http://wifi5.eu/dls/524wifi/WiFi6-MT7915-modules/

Application

Let’s have a look at the screenshots by using Wallys #DR4019 router board plus DR7915 DBDC Wlan module combo.

When the DR7915 is inserted into the DR40X9 board, there are 4 radios that can work at the same time, and it can be used as a soft router

As you can see on pictures attached, by using this combo,there will be 4 radios working at the same time,and you can configure each radio into AP or STA mode as you wish.

DR7915 can work on OpenWrt 21.02 version OS directly, no need to install the driver to support this MTK chipset.

We guess it would be a smart option as well to select #DR7915 for applications which require Multi-radios,soft router, Mesh,bonding etc…

Weight 0.2 kg
Dimensions 6 × 4 × 1 cm

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