How to send some random data in between two packets/frames?

Dear All,

I need to send some high impedance/IDLE symbols (eg 101010...) between the two packets/frames for long time. So is it possible in UVM to send some random data (not through packets in the form of bytes)? If yes, how do I do it? Can this be done through some constraint variables, set in a config db object? Its urgent, so any guidance, regarding the process, will be appreciated. 

Thanks