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[Discuss-gnuradio] Recommendations for USB 2.0 add-on PCI Cards

From: John Stralka
Subject: [Discuss-gnuradio] Recommendations for USB 2.0 add-on PCI Cards
Date: Thu, 21 Jun 2007 18:07:33 -0700 (PDT)

I'm running GNU Radio on a Dell Precision 530MT workstation under Ubuntu.  
Unfortunately, the system only has USB 1.0 ports.  I installed an 6-port USB 
2.0 add-on PCI card, but I only get a maximum transfer rate of 16 Mbps when I 
run "benchmark_usb.py" from "gnuradio-examples/python/usrp".  I also ran 
"test_usrp_standard_tx" and "test_usrp_standard_rx" from "usrp/host/apps".  The 
transmit part worked fine, but I got a lot of over-runs on receive.  My add-on 
card is based on the NEC chipset, which I gather is not capable of achieving a 
maximum rate of 32 Mbps with the USRP.  Are there other cards and/or chipsets 
that achieve 32 Mbps?  It's hard to come across a card that isn't based on the 
NEC chipset.  Matt Ettus mentioned that the Zonet PCMCIA card based on the VIA 
chipset works good.  Is there one in the PCI form-factor that works as well?  
Any suggestions are appreciated.  Thank you.

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