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/n2×2 2.4G & 2×2 5G MIMO Technology, up to 1.8Gbps Mini PCI Express edge connectorSupporttheFrequency2412MHz~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
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…
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