Re: [Discuss-gnuradio] [ USRP configuration with/without MIMO in unshared Ethernet mode ]

[Josh Blum]

> 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.

-josh