vinh – i am not familiar with RBS3XXX series (we use RBS 200 and 2000’s in a single 1800 freq. band)However i do know that local mode means that you will have to get a field engineer to take a look. They could need replacing. Also for CF faults a remote site reset to re-sync normally fixes (RXBLI:mo=RXOTG-xx,subord,force; followed by ; and then RXBLE:mo=RXOTG-xx,subord; followed by ; and then CTRL D) – hope this helps.