My system setup is as follows:

   - 2 x USRP x310 with CBX-120 daughterboard
   - 2 x Ubuntu 18.04 workstation
   - 2 x Taoglas 45.8113 antenna
   - 2 x  Internal Reference Clock (Master Clock set at 184.32 MHz)
   - 2 x Internal Time source
   - 2 x Connected via 1 Gig-E interfaces
   - 2 x Using UHD 4.1

The devices have been in two setups: stacked and a few inches apart.

I am attempting to deploy a 5G network using the openairinterface (OAI)
software system. Both devices synchronize initially, then they fail. With
openairinterface, I am using frequency offset compensation at the UE. Its a
useful parameter when running over the air and/or without an external
clock/time source (
https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/RUNMODEM.md
)

Is there a way to synchronize the reference clock/timing of both USRP x310s
over the air? In the future, I will be attempting to connect a third USRP
x310. My setup will include one base station and two user devices.

V/r

LoyCurtis Smith
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