In some CATV setup's, the de-scrambling of services are performed by the customer owned devices (TV, settop box etc. with CAM/smartcard) and not by the headend.

This requires scrambled services - including EMM's and ECM's -  to be passed through the headend.

Please make sure the "CAT tables" are enabled, if the de-scrambling is done by the customer devices.

When enabled, the output QAM / MUX will have the CAT table braodcasted: