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Re: [Discuss-gnuradio] Timestamps, data rates
From: |
Juha Vierinen |
Subject: |
Re: [Discuss-gnuradio] Timestamps, data rates |
Date: |
Thu, 16 Apr 2009 21:05:50 +0000 |
>> Similar issues exist on the transmit side.
Ok.
> Actually they are quite different. When we assert flow control, we flow
> control _everything_ upstream between the USRP2 and the host. Unless
> you want your network to die, die, die, don't put a switch between
> the USRP2 and the host if you are transmitting, and for sure, don't
> plug anything else into the switch.
Mental note to self: unplug USRP from campus-wide LAN first thing
tomorrow. I just checked and I could find_usrps my USRP2 from home,
and I'm on a 100 Mbit hub, 1 km away from work, on the same _large_
LAN.
I guess I'll then go for a PCI Express card with many independent
ethernet interfaces. I just would've been so practical to just plug
USRP2s into a switch.
How about overflows. What is the probability that a USRP2 will drop
samples guring 24 h of 10 MHz receiving when connected directly to a
computer? I guess there is no mechanism that guarantees that the data
is delivered, but there has to be a mechanism that guarantees that you
know if samples have been lost?
> For all the gory details on this, see a good reference on Gigabit
> ethernet flow control. I found Rich Seifert's, "Gigabit Ethernet:
> Technology and Applications for High-Speed LANS" useful. You could
> also read the GigE ethernet spec.
I'll try to look this up. but I think I'm mentally about six-seven
layers above or below this stuff in the OSI model ;)
juha
- [Discuss-gnuradio] Timestamps, data rates, Douglas Geiger, 2009/04/14
- Re: [Discuss-gnuradio] Timestamps, data rates, Eric Blossom, 2009/04/15
- Re: [Discuss-gnuradio] Timestamps, data rates, Juha Vierinen, 2009/04/16
- Re: [Discuss-gnuradio] Timestamps, data rates, Johnathan Corgan, 2009/04/16
- Re: [Discuss-gnuradio] Timestamps, data rates, Eric Blossom, 2009/04/16
- Re: [Discuss-gnuradio] Timestamps, data rates,
Juha Vierinen <=
- Re: [Discuss-gnuradio] Timestamps, data rates, Eric Blossom, 2009/04/16
- RE: [Discuss-gnuradio] Timestamps, data rates, Ben Buley, 2009/04/16
- Re: [Discuss-gnuradio] Timestamps, data rates, Eric Blossom, 2009/04/16