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List: usrp-users
Subject: Re: [USRP-users] Help diagnosing loss of USB 3.0 on B200
From: Ryan Bosley via USRP-users <usrp-users () lists ! ettus ! com>
Date: 2016-05-30 2:37:18
Message-ID: CANBLnD-Y8LWpzyvE4Hvj+EWDFZVkdTP1fjt6bP7MTwg6wykHAg () mail ! gmail ! com
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Thanks for the suggestions. It is a micro connector on one of the first
version of b200 (white board)
I'll see if I can find someone with a B200 and take a close look at the
board under a microscope next chance I get.
I was thinking the small blade contacts inside B200 connector might be
wearing... I guess worst case, a replacement USB connector wouldn't be too
hard. I'm well outside the warranty at this point.... so it's probably
cheaper/quicker to place an order to Digikey and fire up the soldering iron.
On Sun, May 29, 2016 at 9:15 PM, Ian Buckley via USRP-users <
usrp-users@lists.ettus.com> wrote:
> To add to Marcus's comment...USB3 SS being 5Gbps is super fussy about
> signal integrity, damage/wear on a scale thats not easy to see could cause
> it to fall back to USB2 rates. Is this an older board with a micro
> connector or one of the newer ones with the nice meaty full size connector?
> If you know someone esle with a B2x0 that might be your quickest sanity
> test to eliminate your USRP as the issue, the multimeter might not cut it.
>
> On Sun, May 29, 2016 at 5:42 PM, Marcus D. Leech via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
>> On 05/29/2016 08:30 PM, Ryan Bosley via USRP-users wrote:
>>
>>> Until very recently I had very little trouble getting USB 3 connectivity
>>> to my B200.
>>> Really nothing has changed.... Same computer, no upgrades to Ubuntu or
>>> GnuRadio.
>>> Then this weekend, I've started having issues where I can only connect
>>> with USB 2.
>>>
>>> I've tried several different USB 3 cables which doesn't seem to help.
>>> I've even tried different computers that seem to have worked in the past
>>> with no luck.
>>>
>>> In a couple cases where the cable had a 1/2 twist (putting a bit of
>>> extra downward pressure on the B200 side of the connector) between the
>>> computer and B200, I was able to get USB 3 to work for a little while.
>>> However, it is not repeatable.. and the USB 3 connector on the B200 board
>>> is pretty solid (no wiggle).
>>>
>>> I've ohmed out the connections in the cable (from the side of the cable
>>> that plugs into the PC to the pins on the B200 board) and all the contacts
>>> "appear" to be ok.
>>>
>>> So, I'm wondering has anyone else has experienced this issue?
>>> Does this sound like a lose USB connector? Bad Cable? Something awry
>>> with the FX3 chip?
>>>
>>> Any suggestions on next steps in diagnosis are appreciated,
>>> Ryan (N4ONS)
>>>
>>>
>> I would inspect the board for cold solder connections or cracked traces.
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users@lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>
>
> _______________________________________________
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> USRP-users@lists.ettus.com
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>
>
[Attachment #5 (text/html)]
<div dir="ltr"><div>Thanks for the suggestions. It is a micro connector on one of \
the first version of b200 (white board)<br>I'll see if I can find someone with a \
B200 and take a close look at the board under a microscope next chance I \
get.<br><br></div>I was thinking the small blade contacts inside B200 connector might \
be wearing... I guess worst case, a replacement USB connector wouldn't be too \
hard. I'm well outside the warranty at this point.... so it's probably \
cheaper/quicker to place an order to Digikey and fire up the soldering \
iron.<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May \
29, 2016 at 9:15 PM, Ian Buckley via USRP-users <span dir="ltr"><<a \
href="mailto:usrp-users@lists.ettus.com" \
target="_blank">usrp-users@lists.ettus.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">To add to Marcus's comment...USB3 SS being \
5Gbps is super fussy about signal integrity, damage/wear on a scale thats not easy to \
see could cause it to fall back to USB2 rates. Is this an older board with a micro \
connector or one of the newer ones with the nice meaty full size connector? If you \
know someone esle with a B2x0 that might be your quickest sanity test to eliminate \
your USRP as the issue, the multimeter might not cut it.</div><div \
class="gmail_extra"><br><div class="gmail_quote">On Sun, May 29, 2016 at 5:42 PM, \
Marcus D. Leech via USRP-users <span dir="ltr"><<a \
href="mailto:usrp-users@lists.ettus.com" \
target="_blank">usrp-users@lists.ettus.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div><div>On 05/29/2016 08:30 PM, Ryan Bosley via USRP-users \
wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"> Until very recently I had very little trouble getting \
USB 3 connectivity to my B200.<br> Really nothing has changed.... Same computer, no \
upgrades to Ubuntu or GnuRadio.<br> Then this weekend, I've started having issues \
where I can only connect with USB 2.<br> <br>
I've tried several different USB 3 cables which doesn't seem to help.<br>
I've even tried different computers that seem to have worked in the past with no \
luck.<br> <br>
In a couple cases where the cable had a 1/2 twist (putting a bit of extra downward \
pressure on the B200 side of the connector) between the computer and B200, I was \
able to get USB 3 to work for a little while. However, it is not repeatable.. and \
the USB 3 connector on the B200 board is pretty solid (no wiggle).<br> <br>
I've ohmed out the connections in the cable (from the side of the cable that \
plugs into the PC to the pins on the B200 board) and all the contacts \
"appear" to be ok.<br> <br>
So, I'm wondering has anyone else has experienced this issue?<br>
Does this sound like a lose USB connector? Bad Cable? Something awry with the FX3 \
chip?<br> <br>
Any suggestions on next steps in diagnosis are appreciated,<br>
Ryan (N4ONS)<br>
<br>
</blockquote>
<br></div></div>
I would inspect the board for cold solder connections or cracked traces.<br>
<br>
<br>
<br>
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</blockquote></div><br></div>
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<br></blockquote></div><br></div>
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