*Thanks Josh. Now I've got a clear idea on how the MIMO acts in different Ethernet configurations**. *
> > > Message: 1 > Date: Thu, 11 Oct 2012 11:34:39 -0700 > From: Josh Blum <[email protected]> > To: [email protected] > Subject: Re: [Discuss-gnuradio] [ USRP configuration with/without MIMO > in unshared Ethernet mode ] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252 > > > > received/transmitted via its own Ethernet interface and the master?s > > basedband data within the GRC design is received/transmitted via its own > > Ethernet interface? So, this means that the MIMO cable is only used for > > sending the clock and time signals from the Master to the Slave ?* > > Thats correct. When each USRP has its own ethernet link, the MIMO cable > is only used for clock and time signals. > > > > > * * > > > > *Next, I retained the MIMO cable, set the Master USRP?s clock source to > > external and have a 10MHz source connected to the Reference input. The > > slave USRP?s clock source and time source remained as MIMO mode. So my > > question is would the Slave USRP received the 10MHz Reference via the > MIMO > > cable ? * > > > > Yes. The slave device will still get 10MHz over the MIMO cable. This is > regardless of how the master gets his reference. > > > * * > > > > *My second question is: > > In a 4X4 USRP setup, how can we synchronize all the 4 USRPs without a > MIMO > > connection (between 2 USRPs within a pair), using a 10MHz reference split > > to each of the USRP and a PPS source? > > Yes, you can split 10MHz and PPS signal to all 4 units. > > -- Ashish
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