# Bug with USRP2/SBX and UHD when launching the acquisition **URL:** \ **Category:** GNU Radio\ **Created:** [August 5, 2011, 4:35pm UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359 "2011-08-05T16:35:06Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Post date:** [August 5, 2011, 4:35pm UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359/1 "2011-08-05T16:35:06Z")
Hello all, I have a problem with my USRP2 (with a SBX board) : Most of times when I launch the acquisition, no data are received. For example with uhd\_fft.py : $ uhd\_fft.py linux; GNU C++ version 4.5.2; Boost\_104200; UHD\_003.002.001-fc349d3 – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes and the FFT Plotter appear but is empty. I have to try up to five times to make it work. Anyone having the same problem ? Or do you know what may it be ? If it can help, I am using a Gigabit Switch and Ubuntu 11.04 – Emmanuel ---
**Author:** ![SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7bcc69/32.png) [@SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/u/SSEmmanuel_CaillSSS)\ **Post date:** [August 5, 2011, 5:51pm UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359/2 "2011-08-05T17:51:11Z")
On 08/05/2011 07:33 AM, Emmanuel Caill wrote: > – Current recv frame size: 1472 bytes > – Current send frame size: 1472 bytes > > and the FFT Plotter appear but is empty. > > I have to try up to five times to make it work. > > Anyone having the same problem ? Or do you know what may it be ? 1. If there were no samples, you would see a timeout error printed to the terminal. 2. If the samples were all zero, press autoscale, you should see a horizontal blue line. Which one do you see? ---
**Author:** ![SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7bcc69/32.png) [@SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/u/SSEmmanuel_CaillSSS)\ **Post date:** [August 5, 2011, 6:51pm UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359/3 "2011-08-05T18:51:06Z")
On 05/08/2011 10:33 AM, Emmanuel Caill wrote: > – Current recv frame size: 1472 bytes > – Current send frame size: 1472 bytes > > and the FFT Plotter appear but is empty. Also, what do you get with uhd\_usrp\_probe --args “addr=192.168.10.2” (or whatever you’ve set the IP addr of the USRP2 to). ---
**Author:** ![SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7bcc69/32.png) [@SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/u/SSEmmanuel_CaillSSS)\ **Post date:** [August 8, 2011, 9:40am UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359/4 "2011-08-08T09:40:32Z")
2011/8/5 Marcus D. Leech [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > > linux; GNU C++ version 4.5.2; Boost\_104200; UHD\_003.002.001-fc349d3 There are no samples (autoscale don’t do anything) and there are no timeout errors. I perfectly ping the device (with 0% packet loss). I don’t understand why sometimes it works and at other times it doesn’t (without changing any option). $ uhd\_usrp\_probe linux; GNU C++ version 4.5.2; Boost\_104200; UHD\_003.002.001-fc349d3 – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes * * * / | Device: USRP2 / N-Series Device | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | / | | Mboard: USRP2-REV4 | | rev: 1024 | | mac-addr: 00:50:c2:85:3a:a4 | | ip-addr: 10.66.160.164 | | gpsdo: none | | serial: 2724 | | | | Time sources: none, external, _external_, mimo | | Clock sources: internal, external, mimo | | Sensors: mimo\_locked, ref\_locked | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX DSP: 0 | | | Freq range: -50.000 to 50.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX DSP: 1 | | | Freq range: -50.000 to 50.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX Dboard: A | | | ID: SBX (0x0054) | | | Serial: E7R10Y0XS | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Subdev: 0 | | | | Name: SBX (0x0054) | | | | Antennas: TX/RX, RX2 | | | | Sensors: lo\_locked | | | | Freq range: 68.750 to 4400.000 Mhz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Connection Type: IQ | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Codec: A | | | | Name: ltc2284 | | | | Gain Elements: None | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | TX DSP: 0 | | | Freq range: -250.000 to 250.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | TX Dboard: A | | | ID: SBX (0x0055) | | | Serial: E7R10Y0XS | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | TX Subdev: 0 | | | | Name: SBX (0x0055) | | | | Antennas: TX/RX | | | | Sensors: lo\_locked | | | | Freq range: 68.750 to 4400.000 Mhz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Connection Type: QI | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | TX Codec: A | | | | Name: ad9777 | | | | Gain Elements: None (I had the same problem when I used the 192.168.10.2 IP) ---
**Author:** ![SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7bcc69/32.png) [@SSEmmanuel\_CaillSSS](https://www.ruby-forum.com/u/SSEmmanuel_CaillSSS)\ **Post date:** [August 8, 2011, 11:06am UTC](https://www.ruby-forum.com/t/bug-with-usrp2-sbx-and-uhd-when-launching-the-acquisition/210359/5 "2011-08-08T11:06:41Z")
2011/8/8 Emmanuel Caillé [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > > > $ uhd\_fft.py > > > addr of the USRP2 to). > > > linux; GNU C++ version 4.5.2; Boost\_104200; UHD\_003.002.001-fc349d3 > > > | | rev: 1024 > > > | | | RX DSP: 0 > > > | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ > > > | | | / > > > | | | ID: SBX (0x0055) > > > | | | | Uses LO offset: No > > > | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ > > > | | | / > > > | | | | TX Codec: A > > > | | | | Name: ad9777 > > > | | | | Gain Elements: None > > (I had the same problem when I used the 192.168.10.2 IP) I fixed my problem : I replaced my Gigabit Switch with a crossed cable and know everything work fine. Thanks for your advices. – Emmanuel