N300/N310

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Notice

When you receive a brand-new device, it is strongly recommended that you download the most recent filesystem image from the Ettus Research website and write it to the SD card that comes with the unit. It is not recommended that you use the SD card from the factory as-is. Instructions on downloading the latest filesystem image and writing it to the SD card are listed below.

Note that if you are operating the device in Network Mode, the version of UHD running on the host computer and the USRP N3xx must match.

Device Overview

The USRP N310 is a networked software defined radio that provides reliability and fault-tolerance for deployment in large scale and distributed wireless systems. This device simplifies control and management of a network of radios by introducing the unique capability to remotely perform tasks such as debugging, updating software, rebooting, factory resetting, self-testing, and monitoring system health. The USRP N310 is an all-in-one device that includes two AD9371 transceivers, the Zynq-7100 SoC baseband processor, two SFP+ ports, a built-in GPSDO module, and various other peripheral and synchronization features.

Key Features

N300

  • Xilinx Zynq-7035 FPGA SoC
  • Dual-core ARM A9 800 MHz CPU
  • 2 RX, 2TX in half-wide RU form factor
  • 10 MHz – 6 GHz extended frequency range
  • Up to 100 MHz of instantaneous bandwidth per channel
  • RX, TX filter bank
  • 16 bit ADC, 14 bit DAC
  • Configurable sample rates: 122.88, 125, and 153.6 MS/s
  • Two SFP+ ports (1 GbE, 10 GbE, Aurora)
  • RJ45 (1 GbE)
  • 10 MHz clock reference
  • PPS time reference
  • Built-in GPSDO
  • 1 Type A USB host port
  • 1 micro-USB port (serial console, JTAG)
  • Watchdog timer
  • OpenEmbedded Linux
  • High channel density
  • Reliable and fault-tolerant deployment
  • Remote management capability
  • Stand-alone operation
  • USRP N300 does not contain a Trusted Platform Module
n300 kit.jpg


N310

  • Xilinx Zynq-7100 FPGA SoC
  • Dual-core ARM A9 800 MHz CPU
  • 4 RX, 4TX in half-wide RU form factor
  • 10 MHz – 6 GHz extended frequency range
  • Up to 100 MHz of instantaneous bandwidth per channel
  • RX, TX filter bank
  • 16 bit ADC, 14 bit DAC
  • Configurable sample rates: 122.88, 125, and 153.6 MS/s
  • Two SFP+ ports (1 GbE, 10 GbE, Aurora)
  • RJ45 (1 GbE)
  • 10 MHz clock reference
  • PPS time reference
  • External RX, TX LO input ports
  • Built-in GPSDO
  • 1 Type A USB host port
  • 1 micro-USB port (serial console, JTAG)
  • Trusted Platform Module (TPM) v1.2
  • Watchdog timer
  • OpenEmbedded Linux
  • High channel density
  • Reliable and fault-tolerant deployment
  • Remote management capability
  • Stand-alone operation
n310 kit.png


RF Specifications

Transmitter

  • Number of channels: 4
  • Frequency Range: 10 MHz to 6 GHz
  • Maximum instantaneous bandwidth: 100 MHz
  • Minimum frequency step
    • 7.32 Hz @ 122.88 MHz sample rate
    • 7.45 Hz @ 125 MHz sample rate
    • 9.15 Hz @ 153.6 MHz sample rate
  • Maximum output power (P​ out​ ): See Table 1
  • Gain range
    • -30 dB to 25 dB (10 MHz to 300 MHz)
    • -30 dB to 20 dB (300 MHz to 6 GHz)
  • Gain step: 1 dB
  • Supported I/Q sample rates:
    • 122.88 MHz, 125 MHz, 153.6 MHz
  • Spurious-free dynamic range (SFDR) > 50 dBc
  • Output third-order intercept (OIP3) See Table 2


Frequency Maximum Output Power
10 MHz to 500 MHz +16 dBm
500 MHz to 1 GHz +18 dBm
1 GHz to 4 GHz +18 dBm
4 GHz to 6 GHz +12 dBm

Table 1: Maximum Output Power

Frequency Output Third-Order Intercept (IP3)
10 MHz to 2 GHz > 30 dBm
2 GHz to 4 GHz > 20 dBm
4 GHz to 6 GHz > 10 dBm

Table 2: Third-Order Intercept (IP3)


Receiver

  • Number of channels: 4
  • Frequency Range: 10 MHz to 6 GHz
  • Maximum instantaneous bandwidth: 100 MHz
  • Minimum frequency step
    • 7.32 Hz @ 122.88 MHz sample rate
    • 7.45 Hz @ 125 MHz sample rate
    • 9.15 Hz @ 153.6 MHz sample rate
  • Gain step: 1
  • Maximum recommended input power (P​ in​ ) 1 dB: -15 dBm
  • Noise figure: See Table 3
  • Spurious-free dynamic range (SFDR): > 50 dBc
  • Third-order intermodulation distortion (IMD3) See Table 4
  • Supported I/Q sample rates
    • 122.88 MHz, 125 MHz, 153.6 MHz


Frequency TX/RX Noise Figure RX2 Noise Figure
1.8 GHz 6.8 dB 5.8 dB
2.4 GHz 7.5 dB 6.5 dB
4.4 GHz 7.0 dB 5.5 dB
5.8 GHz 6.4 dB 6.4 dB

Table 3: Noise Figure


Frequency RX IMD3
0.5 GHz to 3 GHz < -80 dBc
3 GHz to 4 GHz < -74 dBc
4 GHz to 6 GHz < -81 dBc

Table 4: RX Third-Order Intermodulation Distortion (IMD3)

  • Noise figure is measured at maximum gain state on receiver signal path.

Onboard DRAM

  • DDR3 Memory size
    • 2,048 MB (PL)
    • 1,024 MB (PS)

Power

You must use either the Level VI Efficiency power supply provided in the shipping kit, or another UL listed ITE power supply marked ​LPS, with the USRP N310.

  • Input voltage: 12 VDC
  • Input current: 7.0 A, maximum
  • Typical power consumption: 50 W to 80 W, varies by application

Hardware Specifications

  • Ettus Research recommends to always use the latest stable version of UHD
  • If you need to clean the module, wipe it with a dry towel.

N310

  • Current Hardware Revision: D
  • Minimum version of UHD required: 3.11.0.0
  • Due to product compliance restrictions on products with TPM (Trusted Platform Module) components to a few countries, the USRP N310 is available in two variants:
    • Standard variant with TPM (P/N 785067-01)
    • Non-TPM variant (P/N 786465-01)

Clocking and Sampling Rates

There are three master clock rates (MCR) supported on the N310: 122.88 MHz; 125.0 MHz; 153.6 MHz.

The sampling rate must be an integer decimation rate of the MCR. Ideally, this decimation factor should be an even number. An odd decimation factor will result in additional unwanted attenuation (roll-off from the CIC filter in the DUC and DDC blocks in the FPGA). The valid decimation rates are between 1 and 1024.

For the MCR of 122.88 MHz, the achievable sampling rates using an even decimation factor are 122.88, 61.44, 30.72, 20.48, 15.36, 12.288, 10.24, 8.777, 7.68 Msps, ... 120.0 Ksps.

For the MCR of 125.0 MHz, the achievable sampling rates using an even decimation factor are 125.0, 62.5, 31.25, 20.833, 15.625, 12.5, 10.41666, 8.9286 Msps, ... 122.07 Ksps.

For the MCR of 153.6 MHz, the achievable sampling rates using an even decimation factor are 156.3, 78.15, 39.075, 26.05, 19.5375, 15.63, 13.025, 11.16429 Msps, ... 152.637 Ksps

If the desired sampling rate is not directly supported by the hardware, then it will be necessary to re-sample in software. This can be done in C++ using libraries such as Liquid DSP [1], or can be done in GNU Radio, in which there are three blocks that perform sampling rate conversion.

Physical Specifications

Dimensions

(L × W × H)

  • 35.71 cm × 21.11 cm × 4.37 cm
  • 14.06 in. × 8.31 in. × 1.72 in.

Weight

  • 3.13 kg

Drawings

N300

N310


Environmental Specifications

Operating Temperature Range

  • N310: 0 to 50 °C

Storage Temperature Range

  • N310: -40 to 70 °C

Operating Humidity Range

  • 10% to 90% non-condensing

Schematics

N300/N310

GPSDO

  • Support GPSDO NMEA Strings

Sensors

You can query the lock status with the gps_locked sensor, as well as obtain raw NMEA sentences using the gps_gprmc, and gps_gpgga sensors. Location information can be parsed out of the gps_gpgga sensor by using gpsd or another NMEA parser.


Specifications

Module Specifications
1 PPS Timing Accuracy from GPS receiver <8ns to UTC RMS (1-Sigma) GPS Locked
Holdover Stability (1 week with GPS) <±50us over 3 Hour Period @+25°C (No Motion, No Airflow)
1 PPS Output 3.3VDC CMOS
Serial Port TTL Level, GPS NMEA Output with 1Hz or 5Hz update rate, Integrated into UHD
GPS Frequency L1, C/A 1574MHz
GPS Antenna Active (3V compatible) or Passive (0dB to +30dB gain)
GPS Receiver 65 Channels, QZSS, SBAS WAAS, EGNOS, MSAS capable

Supports Position and Hold over-determined clock mode

Sensitivity Acquisition -148dBm, Tracking -165dBm
TTFF Cold Start: <32 sec, Warm Start: 1 sec, Hot Start: 1 sec
ADEV 10s: <7E-011

10Ks: <2E-012 (GPS Locked, 25°C, no motion, no airflow)

Warm Up Time / Stabilization Time <10 min at +25C to 1E-09 Accuracy
Supply Voltage (Vdd) 3.3V Single-Supply, +0.2V/-0.15V
Power Consumption <0.16W
Operating Temperature -10°C to +70°C
Storage Temperature -45C to 85C
Oscillator Specifications (internal)
Frequency Output of low Phase Noise crystal 20MHz CMOS 3Vpp
20MHz Retrace ±2E-08 After 1 Hour @ +25°C without GPS
RF Output Amplitude 3Vpp CMOS
20MHz Phase Jitter (100Hz to 10MHz) <0.135ps rms
Frequency Stability Over Temperature (0°C to +60°C) ±0.1ppm (internal TCXO without GPS)
Warm Up Time < 1 min at +25C
Phase Noise at 20MHz 1Hz -65 dBc/Hz
10Hz -97 dBc/Hz
100Hz -116 dBc/Hz
1kHz -136 dBc/Hz
10kHz <-148 dBc/Hz
100 kHz <-155 dBc/Hz

Datasheet

FPGA

FPGA User Modifications

The Verilog code for the FPGA in the USRP N300/N310 is open-source, and users are free to modify and customize it for their needs. However, certain modifications may result in either bricking the device, or even in physical damage to the unit. Specifically, changing the I/O interface of the FPGA in any way, or modifying the pin and timing constraint files, could result in physical damage to other components on the motherboard, external to the FPGA, and doing this will void the warranty. Also, even if the PCIe interface is not being used, you cannot remove or reassign these pins in the constraint file. The constraint files should not be modified. Please note that modifications to the FPGA are made at the risk of the user, and may not be covered by the warranty of the device.

Interfaces and Connectivity

Front Panel

  • PWR: Power switch
  • RF 0 Group
    • TX/RX SMA/LED: RF Input Port / Indicates that data is streaming on the TX/RX channel on daughterboard 0, channel 0
    • RX2 SMA/LED: RF Input Port / Indicates that data is streaming on the RX2 channel on daughterboard 0, channel 0
  • RF 1 Group
    • TX/RX SMA/LED: RF Input Port / Indicates that data is streaming on the TX/RX channel on daughterboard 0, channel 1.
    • RX2 SMA/LED: RF Input Port / Indicates that data is streaming on the RX2 channel on daughterboard 0, channel 1.
  • RF 2 Group
    • TX/RX SMA/LED: RF Input Port / Indicates that data is streaming on the TX/RX channel on daughterboard 1, channel 0.
    • RX2 SMA/LED: RF Input Port / Indicates that data is streaming on the RX2 channel on daughterboard 1, channel 0.
  • RF 3 Group
    • TX/RX SMA/LED: RF Input Port / Indicates that data is streaming on the TX/RX channel on daughterboard 1, channel 1.
    • RX2 SMA/LED: RF Input Port / Indicates that data is streaming on the RX2 channel on daughterboard 1, channel 1.
  • LO IN 0/1
    • TX: Input port for TX LO of Daughterboard 0. The LO input frequency must be twice the frequency of the desired RF output frequency. An LO input frequency range of 600 MHz to 8000 MHz corresponds to an RF output frequency of 300 MHz to 4000 MHz. LO inputs above 8000 MHz, and RF outputs above 4000 MHz, are not supported. The LO input signal level should be +3 dBm, but may be between 0 dBm and +6 dBm.
    • RX: Input port for RX LO of Daughterboard 0. The LO input frequency must be twice the frequency of the desired RF output frequency. An LO input frequency range of 600 MHz to 8000 MHz corresponds to an RF output frequency of 300 MHz to 4000 MHz. LO inputs above 8000 MHz, and RF outputs above 4000 MHz, are not supported. The LO input signal level should be +3 dBm, but may be between 0 dBm and +6 dBm.
  • LO IN 2/3
    • TX: Input port for TX LO of Daughterboard 1. The LO input frequency must be twice the frequency of the desired RF output frequency. An LO input frequency range of 600 MHz to 8000 MHz corresponds to an RF output frequency of 300 MHz to 4000 MHz. LO inputs above 8000 MHz, and RF outputs above 4000 MHz, are not supported. The LO input signal level should be +3 dBm, but may be between 0 dBm and +6 dBm.
    • RX: Input port for RX LO of Daughterboard 1. The LO input frequency must be twice the frequency of the desired RF output frequency. An LO input frequency range of 600 MHz to 8000 MHz corresponds to an RF output frequency of 300 MHz to 4000 MHz. LO inputs above 8000 MHz, and RF outputs above 4000 MHz, are not supported. The LO input signal level should be +3 dBm, but may be between 0 dBm and +6 dBm.
  • GPIO
    • GPIO: DB15 GPIO Interface. Additional details below.


 n310 front.png

Rear Panel

  • GPS ANT: Connection for the GPS antenna
  • REF IN: Reference clock input
  • PPS/TRIG IN: Input port for the PPS signal
  • TRIG OUT: Output port for the exported reference clock
  • PWR: Connector for the USRP N310 Series power supply
  • RESET: Input button to reset device
  • MicroSD: MicroSD Card for OE Linux File System
  • JTAG: Micro USB connector for the on-board USB-JTAG programmer
  • USB 2.0: Host USB connector to ARM CPU
  • SFP+: 1/10Gb SFP+ ports for Ethernet interfaces
  • 10/1000/1000: 10/100/1000 Mb Ethernet interface to ARM CPU
 n310 back.png

Ref Clock - 10 MHz

Using an external 10 MHz reference clock, a square wave will offer the best phase noise performance, but a sinusoid is acceptable. The power level of the reference clock cannot exceed +10 dBm.

PPS - Pulse Per Second

Using a PPS signal for timestamp synchronization requires a square wave signal (a typical PPS signal has a 20%-25% duty cycle) with a 5Vpp amplitude.

To test the PPS input, you can use the following tool from the UHD examples:

  • <args> are device address arguments (optional if only one USRP device is on your machine)
   cd <install-path>/lib/uhd/examples ./test_pps_input –args=<args>

Front Panel GPIO

The GPIO port is not meant to drive big loads. You should not try to source more than 5mA per pin.

The +3.3V is for ESD clamping purposes only and not designed to deliver high currents.


Power on state

The hardware power on state and UHD initial state for the front-panel GPIOs is high-Z. For the N310, there are no external pull-ups/pull-downs for the GPIO pins, but the FPGAs do have them and they are configured as follows: N310: pull-down.

Pin Mapping

  • Pin 1: +3.3V
  • Pin 2: Data[0]
  • Pin 3: Data[1]
  • Pin 4: Data[2]
  • Pin 5: Data[3]
  • Pin 6: Data[4]
  • Pin 7: Data[5]
  • Pin 8: Data[6]
  • Pin 9: Data[7]
  • Pin 10: Data[8]
  • Pin 11: Data[9]
  • Pin 12: Data[10]
  • Pin 13: Data[11]
  • Pin 14: 0V
  • Pin 15: 0V

Note: Please see the E3x0/X3x0/N3x0 GPIO API for information on configuring and using the GPIO bus.

Power Connector

Model: PDP-40 by CUI Inc.

Power plug connectors for custom power harnesses can be purchased here: https://www.digikey.com/products/en?KeyWords=CP-7340-ND&WT.z_cid=sp_102_buynow

Assembly instructions: Media:pdp-40.pdf

Pin Detail

  • Pins #1 / #2: 12v
  • Pins #3 / #4: Ground

pdp 40 power detail.png

Certifications

RoHS

As of December 1st, 2010 all Ettus Research products are RoHS compliant unless otherwise noted. More information can be found at http://ettus.com/legal/rohs-information

China RoHS

Management Methods for Controlling Pollution Caused by Electronic Information Products Regulation

Chinese Customers

National Instruments is in compliance with the Chinese policy on the Restriction of Hazardous Substances (RoHS) used in Electronic Information Products. For more information about the National Instruments China RoHS compliance, visit ni.com/environment/rohs_china.

Certificate of Volatility

N300/N310

Downloads

FPGA Resources

UHD Stable Binaries

UHD Source Code on Github

Choosing a Host Interface

10 Gigabit Ethernet

Recommended 10 Gigabit Ethernet Cards

International Power Supply Options

The power supply provided with the USRP N310 kit is packaged with a power cord that is compatible with power outlets in the US/Japan. If you are not using the USRP N310 in the US/Japan, we recommend purchasing the International USRP N310 Power Cord set.

Option: USRP N300/N310 Rackmount

The USRP N300/N310 was designed to be used with a 1U Rackmount Assembly for building high-density MIMO systems in a compact and well-organized setup. This mount requires two compatible USRPs, and provides rubber standoffs between the USRPs to avoid both direct contact and surface scratching. If the user will be developing in a laboratory environment or building a high-channel count USRP system, then a 1U Rackmount Assembly is highly recommended. This specific mount is compatible with only the USRP N300, N310, N320, and N321, and allows the integration of up to eight bidirectional RF channels per 1U.

Guidance on SFP+ Adapters for Fiber Connectivity on USRP N310

Ettus Research currently offers direct-connect, copper cabling accessories for the USRP N300/N310. However, it is also possible to use multi-mode fiber instead of copper connections for these devices. In this section, we will provide general guidance on the types of fiber adapters and cables that can be used with these products.

The USRP N300/N310 USRP is compatible with most brands of SFP+ fiber adapters. In some cases, other equipment in the systems such as 1/10 Gigabit Ethernet switches are only compatible with specific brands of SFP+ adapters and cables. As a general rule, we recommend checking compatibility with the switches and network cards in your system before purchasing an adapter.

Ettus Research does test the USRP N300/N310 USRP devices with our 10 Gigabit Ethernet Connectivity Kit and a Blade Networks G8124 1/10 GigE switch. Here are is a list of known-good cables and adapters.

Ettus Research has only tested multi-mode fiber accessories.

Known-Good Adapters

Known-Good Cables

Guidance on 10Gb SFP+ to RJ45 Adapters

Many new motherboards come equipped with an onboard 10Gb RJ45 NIC. It is possible to use a SFP+ to RJ45 adapter and operate at 10Gb speeds using a Cat6/7 Ethernet cables.

Ettus Research has tested the adapters linked below.

Known-Good Adapters

Data Throughput Rates

As of UHD version 3.14.0.0, the following data rates have been tested and validated.

Number of TX Channels Number of RX Channels Maximum Sampling Rate
1 0 153.6 MS/s
0 1 153.6 MS/s
1 1 153.6 MS/s
2 0 125 MS/s
0 2 125 MS/s
2 2 125 MS/s
3 0 62.5 MS/s
0 3 125 MS/s
3 3 62.5 MS/s TX, 125 MS/s RX
4 0 62.5 MS/s
0 4 125 MS/s
4 4 62.5 MS/s TX, 125 MS/s RX
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