If the hostname does not resolve, you can discover the IP address by logging into the device over the serial connection, or checking your network?s
DHCP tables.
Once you have logged in to the device, you can reconfigure the network settings (e.g., you could configure it for a static IP address, if you wish).
When you first log in to the device, the user is ?root? and the password is empty (no password).
The USRP E31x contains 2 channels, each represented on the front panel as
TRX-A / RX2-A
and
TRX-B / RX2-B
. Below is the
subdev
mapping of RF
TRX-A / RX2-A = A:0
•
TRX-B / RX2-B = B:0
•
TRX-A / RX2-A = A:0
•
TRX-B / RX2-B = A:1
•
Additional details of UHD Subdevice Specifications can be found here in the UHD Manual:
http://files.ettus.com/manual/page_configuration.html#config_subdev
The UHD driver includes several example programs, which may serve as test programs or the basis for your application program. These example
programs are already installed on the E31x device, and the source code can be obtained from the UHD repository on GitHub at:
https://github.com/EttusResearch/uhd/tree/master/host/examples
You can quickly verify the operation of your USRP E31x by running the
rx_ascii_art_dft
UHD example program. The
rx_ascii_art_dft
utility is a
simple console −based, real−time FFT display tool. It is not graphical in nature, so it can be easily run over an SSH connection within a terminal window,
and does not need any graphical capability, such as X Windows, to be installed. It can also be run over a serial console connection, although this is not
recommended, as the formatting may not render correctly.
You can run a simple test of the E31x device by connecting an antenna and observing the spectrum of a commercial FM radio station in real−time.
Please follow the steps listed below.
1. Attach an antenna to the RX2−A antenna port of the E31x.
2. Log into the E31x from an external host computer over Ethernet using an SSH client.
3. At a terminal prompt running on the E31x, run:
/usr/lib/uhd/examples/rx_ascii_art_dft −−--freq 88.1e6 −−--rate 400e3 −−--gain 30 −−--ref−-lvl −-30
4. Modify the command−line argument "
freq
" ?above to specify a tuning frequency for a strong local FM radio station.
5. You should see a real−time FFT display of 400 KHz of spectrum, centered at the specified tuning frequency.
6. Type "
Q
" or
Ctrl−-C
to stop the program and to return to the Linux command line.
7. You can adjust the size of your terminal window and then re−run the command to enlarge or shrink the FFT display.
8. You can run with the "?−−help"?option to see a description of all available command−line options.
Additional information is available at the
Verifying the Operation of the USRP Using UHD and GNU Radio
The USRP E312 is equipped with an integrated 3.7V, 3200mAh lithium−ion battery cell. After unboxing the USRP E312 , plug in the power adapter to an
AC power source and fully charge the battery. This process with take approximately 2 hours. Do not leave the USRP E312 unit plugged in for more than
24 hours.
The status LED in the power button indicates the power and charge status of the battery:
Off: Indicates device is off and not charging.
Slow Blinking Green: Indicates device is off and charging.
•
Fast Blinking Green: Indicates device is on and charging.
•
Solid Green: Indicates device is on and not charging (Battery is finished charging).
•
Solid Orange: Indicates device is on and discharging.
•
Fast Blinking Orange: Indicates device is on, discharging, and charge is below 10% charge.
•
Fast Blinking Red: Indicates an error code:
•
Low Voltage Error
1.
Regulator Low Voltage Error
2.
FPGA Power Error
3.
DRAM Power Error
4.
1.8V Power Rail Error
5.
3.3V Power Rail Error
6.
Daughterboard / TX Power Error
7.
Charger Error
8.
Charger Temperature Error
9.
Battery Low Error
10.
Fuel Gauge Temperature Error
11.
Global (Enclosure) Temperature Error
12.
The battery life of the USRP E312 in idle mode is approximately 5 1/2 hours. The battery will enable the USRP E312 to operate for approximately 2
hours 20 minutes, when transmitting and receiving on both channels (2x2 MIMO), with maximum gain settings, at 5 GHz center frequency, and 1 MS/s
sample rate. When the power button status LED is in the ?Fast Blinking Orange? mode, plug the USRP E312 into an AC power source as soon as
possible to recharge the battery.
