Data Sheet: NM-DB-2

2×2 MIMO Streams, Dual Band, IEEE802.11n Industrial Wi-Fi transceiver

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Model No. NM-DB-2 
(Rugged/Military Applications, 802.11n)
Ordering Code NM-DB-2M with MMCX connectors.
NM-DB-2U with U.FL connectors. 
Integration Guide Available Upon Request
Special Features – Extreme Reliability, IPC Class 2 standard with Class 3 options
– Compliant to MIL-STD-202G, Qualified for high shock/vibration environments
– Extended lifespan with planned availability for long time
MAC Chipset 11n Models – Qualcomm Atheros
QCA9590-BR4B with Extended Temperature range)
Software Support Open Source Linux Drivers
ath9k for 11n models
OpenWRT (Wireless Router/Linux OS)
Center Frequency Range 5.180 GHz ~ 5.825 GHz
2.412 GHz ~ 2.484 GHz 
This varies by the regulatory domain    
Channel Bandwidth* 20, and 40 MHz channels
Radio Modulation/Data Rates (Dynamic Link Adaptation) 802.11a: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps (5.x GHz)
802.11n: MCS0-15 (5.x and 2.4 GHz)
802.11b/g: 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48 and 54 Mbps (2.4 GHz)
802.11n version 2.0 Capabilities ● 802.11 dynamic frequency selection (DFS) as an AP and Client
● Packet aggregation: A-MPDU (Tx/Rx), A-MSDU (Tx/Rx), Maximal ratio combining (MRC), Cyclic shift diversity (CSD), Frame aggregation, block ACK, 802.11e compatible bursting, Spatial multiplexing, cyclic-delay diversity (CDD), low-density parity check (LDPC), Space Time Block Code (STBC)
● Phy data rates up to 450 Mbps (40 MHz channel)    
Operating Modes AP, Client and Adhoc modes to implement Access Point, PtP, PtmP, and Mesh networks    
MAC Protocol TDD with Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)    
Wireless Error Correction FEC, ARQ    
Wireless Data Security 128 bit AES, WEP, TKIP and WAPI hardware encryption. Support for IEEE 802.11d, e, h, i, k, r, v, w and time stamp standards
FIPS Certification Small packet size (96 bytes) in AES encryption at full packet rate.

FIPS 140-2, Level 2 (Temper Evidence Shield), Loop back mode to facilitate FIPS AES certification.
Tx/Rx Specification
Radio Modulation
Coding Rate Tx Power
Rx Sensitivity
5 GHz (20 MHz Channel) – 11n models
802.11a, STBC BPSK  1/2 25 -94
64 QAM  3/4 20 -77
BPSK 1/2 25 -95
802.11n 16 QAM 3/4 24 -82
802.11n 64 QAM 5/6 19 -75
5 GHz (40 MHz Channel) – 11n models  
802.11n BPSK 1/2 25 -91
802.11n 16 QAM 3/4 24 -79
802.11n 64 QAM 5/6 19 -72
2.4 GHz (20 MHz Channel) – 11n models
802.11b, Single Stream, STBC 1 Mbps  CCK 27  -100
64 QAM  3/4 22 -79
802.11n BPSK 1/2 27 -93
802.11n 16 QAM 3/4 25 -81
802.11n 64 QAM 5/6 21 -74
2.4 GHz (40 MHz Channel) – 11n models
802.11n BPSK 1/2 27 -90
802.11n 16 QAM 3/4 25 -78
802.11n 64 QAM 5/6 21 -71
Note 1 It is advantageous to use the smallest Channel Bandwidth that can support the Throughput requirements. Smaller bandwidths provide more channels to choose and help avoid interference issues. The system’s SNR is higher at smaller Channel Bandwidths and Range is longer. 
Note 2 Total Tx power for all streams. Max allowed Tx power depends on the regulatory domain. De-rating of -1 dBm for U.FL connector
Antenna Signal Strength -35 to -85 dBm (Recommended), Absolute Maximum=+12 dBm    
Interference Immunity SAW filters on RF ports for immunity against high power cellular transmissions in the neighboring 2.4 GHz bands.
Antenna port isolation for concurrent operation Up to +10 dBm signal strength for 5 GHz signal without degrading 2.4 GHz operation
Up to +5 dBm signal strength for 2.4 GHz signal without degrading 5.x GHz operation    
Integrated Antenna Port Protection >20 KV (Human Body Model)  
Receiver LNA Gain >10 dB    
Receiver Adjacent Channel Rejection (ACR) >18 dB @ 11a, 6 Mbps (Typ)
Receiver Alternate Channel Rejection (ALCR) >35 dB @ 11a, 6 Mbps (Typ)
Receive chain Noise Figure +6 dB    
Transmitter Adjacent Channel Leakage power Ratio (ACLR)  45 dB (Fc ± ChBW)
Transmitter Spurious Emission Suppression -40 dBc
RF Power control
In 0.5 dBm steps. Accuracy of power calibration loop ±2 dBm. Each transceiver individually calibrated and tested.
RF Hardware Disable (RF Kill) Pin 20 of miniPCI-E interface. (Required for FAA compliance)    
Control for External Power Amp DC biased signal over RF ports
Spectral Analysis 8 bit resolution spectral FFTs available for software analysis    
Host Interface miniPCI-Express 1.2 Standard
Host CPU Board Any CPU board with Industry standard miniPCI-Express interface with minimum 6 mm connector height  
Operating Voltage 3.3 Volts from miniPCI-Express connector
Power Consumption 4W @ Max power, in continuous data transfer mode on all chains
2W @ 20 dBm power (ETSI max), in continuous data transfer mode on all chains
0.7W in continuous data receive mode
250 mW in Sleep mode    
Shield case temperature range (Operating) -40°C to +85°C
System’s thermal design should ensure that the transceiver’s case temperature is maintained within these specifications.    
Humidity (Operating) 0% – 95% (Non-condensing)    
Dimensions 30 x 50 x 7 mm, 12 grams. High Res Photos – Top Side  Bottom Side Mechanical drawing and 3D-CAD files available upon request    
MTBF 29 years
Regulatory Requirements Designed and Verified to meet various regulatory requirements. Formal testing and approval is required based on the Integrator’s particular host platform and antenna type. The Integrator is also responsible for obtaining all required regulatory approvals in target markets for the finished product.    
FCC ID 2AG87NM-DB-3N. DFS compliance in both Master and Client modes. 
CE/ETSI In conformity with all the requirements of the European Directive 1999/5/EC – EN 301 893 V1.8.1, EN 300 328 V.1.8.1, EN 301 489-1 V1.9.2, EN 301 489-17 V2.2.1, EN 60950-1:2006 + A11:2009 + A1:2010 + A12:2011+ A2:2013
Industry Canada (IC) 21411-NMDB3
RoHS/WEEE Compliance Yes. 100% Recyclable/Biodegradable packaging    

 * Specifications are subject to change without prior notice.

System Integration

As shown in the block diagram, the modular nature of the MIMO radio transceivers allow for accelerated development of the wireless modem. Any embedded Single Board Computer with standard miniPCI-Express interface is required. The Linux distribution OpenWRT has evolved over time and provides advanced features in a wireless router. It is a stable distribution and many OEMs are using OpenWRT as a starting point and customize further for their application. The distribution includes the ath9k driver to interface with the MIMO transceivers. Both OpenWRT and open source driver (ath9k) have extensive online documentation available. The user group forums also provide responsive technical support.