Alan Stern wrote:
On Fri, 11 Nov 2005, Aras Vaichas wrote:
Hi,
my test department tells me that they need to perform immunity tests on the
hardware and therefore I will need to collect statistics on the USB data being
transferred.
... SNIP ...
*(h) For production testing, we would want to send a fixed amount of data, and
check the raw and net error rates.
Send the data where? Do you have a fixed testing device in mind?
The embedded board we are building has a 1x USB device port and 2x USB host
ports. I use a USB A-to-B cable to use it to test itself.
Can you please add a 'raw and net bit error count' monitoring output. This
will allow monitoring of the errors on a second by second basis
I don't understand the difference between "raw" and "net" errors. And
like I said, bit error counts are not available, only packet errors. And
not all of those.
I think they meant raw = "bit errors", net = "data did not arrive at all"
(within some timeout period). Bit errors would be reported "somewhere" and
other errors would be handle by my test application at the highest level.
The test department want to be able to zap the USB cable/plugs/sockets with a
high voltage surge and then be able to see how the "system" copes with
electrical discharges in the form of error statistics. These statistics then
form the test results for the ESD immunity documentation. Something like that.
It's not always clear which category an event should fall into. If a data
transfer is refused and delayed because the peripheral device isn't ready,
should that count as an error, a error that was retried, or a success?
Too true. I prefer to report that the data was either a) sent, b) not sent
within a certain time. Much easier to perform from a shell script.
Thank you for the thorough answers. It has helped greatly.
regards,
Aras Vaichas
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