# Bbn 80211b usrp2\_version problem

**URL:** <https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602>\
**Category:** GNU Radio\
**Created:** [October 2, 2009, 11:20pm UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602 "2009-10-02T23:20:35Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![chenchen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/c77e96/32.png) [@chenchen](https://www.ruby-forum.com/u/chenchen)\
**Post date:** [October 2, 2009, 11:20pm UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602/1 "2009-10-02T23:20:35Z")

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Hi, everyone,

I just got two set of USRP2 and want to test it using the bbn 802\_11b  
usrp2\_version. I use the example scripts: bbn\_80211b\_rx.py and  
bbn\_80211b\_tx.py.

I use the default setting: on one machine: ./bbn\_80211b\_rx.py and on  
another  
machine: ./bbn\_80211b\_tx.py

The tx script work correctly. The console print the packets it send. But  
for  
the rx, it can not received any packet, just print out the “S” letter?

Does anyone meet such problem? Thank you very much.

Best,

Chen

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<div class="post-metadata">

**Author:** ![chenchen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/c77e96/32.png) [@chenchen](https://www.ruby-forum.com/u/chenchen)\
**Post date:** [October 3, 2009, 5:26am UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602/2 "2009-10-03T05:26:23Z")

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I think that is a buffer overrun. In otherwords, your computer cannot  
process the data fast enough.

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<div class="post-metadata">

**Author:** ![chenchen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/c77e96/32.png) [@chenchen](https://www.ruby-forum.com/u/chenchen)\
**Post date:** [October 3, 2009, 6:10am UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602/3 "2009-10-03T06:10:53Z")

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Yes. This might help.

“At a decimation rate of 4 you are generating 25 MS/s. If those samples  
are  
complex shorts, that works out to 100 MB/s. If those samples are  
complex  
floats, that is 200 MB/s. In the former case, you really need a RAID  
array  
of at least two fast drives to keep up. In the latter, you’re going to  
need  
to do something more exotic.”

This was in a previous post.

- Miklos

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<div class="post-metadata">

**Author:** ![chenchen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/c77e96/32.png) [@chenchen](https://www.ruby-forum.com/u/chenchen)\
**Post date:** [April 18, 2013, 5:24am UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602/4 "2013-04-18T05:24:47Z")

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Hi：  
I’ve been doing the same things recently. But I wonder if there is  
a  
bbn\_80211 usrp2 version? I know this object from its official  
website:[https://www.cgran.org/wiki/BBN80211](https://www.cgran.org/wiki/BBN80211). And I don’t see anything  
about  
usrp1 version or usrp2 version.  
So confused about this, looking forward to your answer! Thank u so  
much!  
Still ,what ubuntu version and gnuradio version do you use? I 've  
spent too much time on the software environment thing.  
Again,thank u so much!

–  
View this message in context:  
[http://gnuradio.4.n7.nabble.com/bbn-80211b-usrp2-version-problem-tp27147p40872.html](http://gnuradio.4.n7.nabble.com/bbn-80211b-usrp2-version-problem-tp27147p40872.html)  
Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).

---

<div class="post-metadata">

**Author:** ![chenchen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/c77e96/32.png) [@chenchen](https://www.ruby-forum.com/u/chenchen)\
**Post date:** [April 18, 2013, 5:26am UTC](https://www.ruby-forum.com/t/bbn-80211b-usrp2-version-problem/176602/5 "2013-04-18T05:26:32Z")

</div>

Hi：  
I’ve been doing the same things recently. But I wonder if there is  
a  
bbn\_80211 usrp2 version? I know this object from its official  
website:[https://www.cgran.org/wiki/BBN80211](https://www.cgran.org/wiki/BBN80211). And I don’t see anything  
about  
usrp1 version or usrp2 version.  
So confused about this, looking forward to your answer! Thank u so  
much!  
Still ,what ubuntu version and gnuradio version do you use? I 've  
spent too much time on the software environment thing.  
Again,thank u so much!

–  
View this message in context:  
[http://gnuradio.4.n7.nabble.com/bbn-80211b-usrp2-version-problem-tp27147p40873.html](http://gnuradio.4.n7.nabble.com/bbn-80211b-usrp2-version-problem-tp27147p40873.html)  
Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).