Arris TM902 modem can't lock to DS frequency: it constantly scan all DS frequencies, although prints "Got energy" on the correct frequencies (330, 338, 346 MHz..) but continues scanning cycles, include Annex B frequencies. I tried to set 'startup_ds_frequency 338', but this doesn't help. Also, what cause these error messages in Event log:
SYNC Timing Synchronization failure - Failed to acquire FEC framing;
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;
You don't mention the type of CMTS you have, but the likely cause of this is the aforementioned channels are CMTS misconfiguration, the DS channels are in a no shut status and in the appropriate fiber-node (Service Group) configuration, but are not included in the Mac Domain (Docsis-mac) configuration, resulting in channels that have signal being put out but no MAC layer signaling that the modem can use to lock on the channel.
Another possibility is that the channel is set to "no modulation" instead of the appropriate Qam64 or Qam256 modulation, this will behave similarly.
Casa CMTS, not a new.
Most likely there is no Primary channel and, accordingly, DOCSIS time synchronization.