[time-nuts] Seeking info on Ericsson NCD 901 56/1 devices

[John Miller]

Hey all,
Does anyone know anything about these "Ericsson NCD 901 56/1 GPS 03 01" devices? They are all over ebay and are fairly cheap. 

https://www.ebay.com/itm/185337146688

https://www.ebay.com/itm/294113323964

https://www.ebay.com/itm/194342806640

They have one SMA connector and two RJ45, probably RS485? I haven't been able to unearth any documentation on them at all. A few pictures of boxes suggests they were made in 2016-2017 in Poland. 

Any insights?

Thanks!
John
KC1QLN