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I think the Big Ben (by Appogee I think it is) has DARS reference out along with just about anything else you can think of. I believe they can also be locked to GPS satellite clock also which means you could have 2 Big Bens in two locations without a cable link as long as you can receive the GPS signal.

I used DARS to link two iDR10 racks earlier in the year on the advice of the factory, no issues what so ever.