All the UCCM receivers have a EXT option...  but most refer to it as LINK.   
Heather sets it to GPS on startup.  I believe LINK/EXT selects an external 
PPS/PP2S provided by the base station.  I think  they normally operate it in 
GPS mode and switch to EXT if the GPS goes down.

------------------

> I'm still intrigued though by the very existence of that EXT/GPS software 
> switch as a configuration option for the GPSDO itself, and wondering just 
> what EXT might actually imply in this instance. 

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