Indeed in all USRPs other than the E310 and B205c the 1PPS semantic is that 
it’s a trigger for clock reset. It plays no role in ongoing clock steering. 

Sent from my iPhone

> On Aug 10, 2021, at 10:26 PM, [email protected] wrote:
> 
> 
> Hi all,
>  
> I am trying to reset multiple USRPs’ time to 0.000s using a shared 1PPS (1Hz 
> clock signal). As far as I know, the UHD API function is simply to wait for 
> the PPS rising edge and latch the 0.000s value to all USRPs: 
> usrp->set_time_next_pps(uhd::time_spec_t(0.0)).
>  
> My question is that whether I can use any other rate pulses, for instance 
> 2PPS (2Hz clock signal). It seems to me the API function only cares about the 
> first rising edge of the pulse to set the time of all USRPs. And the PPS 
> signal won’t be used anymore as long as I do not reset the USRP time again. 
> Is my understanding correct? Please comment if any. Thank you in advance!
>  
>  
> Jack
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