Re: [Discuss-gnuradio] MAC layer development and USRP2

[Jeff Brower]

Veljko-

> I tried with a stop-and-wait ARQ and two USRP2s with XCVR2450s, but
> the delay was too long and inconsistent. I can't remember the exact
> figures, but definitely up to milliseconds.

Do you mean two USRP2s back-to-back?  Or both connected to motherboard ports?

-Jeff

> 2010/4/6 George Nychis <address@hidden>:
>>
>>
>> On Tue, Apr 6, 2010 at 10:07 AM, Charles Irick <address@hidden> wrote:
>>>
>>> Thanks for the reply George. I'm still looking for a little more
>>> information on this topic.
>>>
>>> - What is PMT
>>
>> http://gnuradio.org/redmine/wiki/1/TypePMT
>>
>>>
>>> - Why was m-block removed
>>
>> http://osdir.com/ml/discuss-gnuradio-gnu/2010-01/msg00066.html
>>
>>>
>>> - Has anyone measured latency with the USRP2 and GigE
>>
>> I'm not sure.
>>
>>>
>>> - Is GigE alone not capable of handling MAC turnaround times or is
>>> software to blame for this
>>
>> I think the latency is on hundreds of microseconds, which is greater than,
>> say, an 802.11 ACK turnaround time (24us).
>>
>>>
>>> - Is the scheduler the main issue in the way it handles i/o between blocks
>>
>>  There are some details of this in the second link I gave.
>>
>> - George
>>
>>
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