In the meantime, I had been advised about the subnet address problem and
alternately had one port assigned by DHCP and the other to 192.168.10.1. The
results are the same. Given that the dongle is not a workable option, I still
have the eth0 port not even showing connectivity. The dongle at least showed
connectivity even if it can't sustain the speed. The port on the T61 is
supposed to be GigE capable, but I can't get it it even show connectivity when
configured with a fixed address.
Al W8KHP
----- Original Message -----
From: Marcus D. Leech
To: discuss-gnuradio@gnu.org
Sent: Wednesday, July 20, 2011 8:22 PM
Subject: Re: [Discuss-gnuradio] Connecting to USRP2 with Thinkpad T61 and UHD
On 07/20/2011 10:23 AM, Allen Vinegar wrote:
I have a working configuration with my desktop computer but can't seem to
get it to work with the laptop. When I connect the USRP2 to the ethernet port
(Gigabit) (configured for 192.168.10.1) the link light fails to go on. I added
a second Gigabit interface using a USB to Gigabit internet dongle at
192.168.10.3. This now shows up as eth1. When I plug the USRP2 into it the
green link light comes on but no activity. Next I take the network cable
connected to my router from the desktop computer and plug it into eth0. I see a
link and activity, eth1 shows a link but no activity. Next I reverse the two
cables, The router cable is plugged into eth1 the link light is on with
activity. The USRP2 is plugged into eth0 and there is no link at all. Does any
one have any ideas on what is going on? Thank you.
Al W8KHP
Is it possible that your T61 ethernet port isn't GigE capable?
Also, there are two problems with the USB dongle setup:
o You assigned it the same subnet address as the other ethernet interface,
so that's likely to cause routing confusion
o A USB-based GiGe dongle won't actually sustain 1GiGe rates--the maximum
it could *possibly* do is 480MBps, but
in reality it'll likely be closer to 300Mbps, which is only about 1/3rd
of what you need.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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