Dear David,

I use a switch to connect two linux systems (one runs OpenBTS and another one runs GNU Radio). I want to make the GNU Radio run a TDM scheme with the same frame clock as OpenBTS. I mean the GNU Radio can know when the timeslot 0 of OpenBTS is in every frame.

              Internet------ switch/
                                             GNU Radio----USRP

I think the TDM scheme needs to get the frame clock information from the transceiver of OpenBTS to keep updating the frame clock of GNU Radio to sync two systems.   The transceiver generates the clock messages, so I think I have to give GNU Radio the clock message.
Do you think it is possible? Do you have any suggestions how to implement this concept based on the OpenBTS? I really appreciate your time and help.