Having a cable bundle consisting of 2 or more VDSL2 profiles will exhibit intermittent sync, port status errors and poor performance. The 30a profile will run on 30 Mhz while the 17a profile will run on 17Mhz. The 30a profile can “bleed” over to the 17a profile. Many chipset manufactures such as Broadcom have stepped away from VDSL2 30a due to this very reason.
Our recommendation is to force all subscriber interfaces to sync at 17a if you have modems that do not support 30a. You shouldn’t have an issue if all ports are synced on the same VDSL2 profile.