Subclass helps filtering the channels on bus function (BC, BM or User), direction (RX or TX) and services (Acquisition, Sampling, Periodic transmit, etc.).

The following Channel Subclass values for bus function are available for the ASCB protocol.

Bus Function

Constant	Description
MXF_SCLASS_BM_CHANNEL	Bus Monitor
MXF_SCLASS_BC_CHANNEL	Bus Controller
MXF_SCLASS_RT_CHANNEL	User

Reception

To get the receive channel handle, the following subclasses can be used:

Constant	Description
MXF_SCLASS_RX_CHANNEL	Generic receive channel
MXF_SCLASS_RXACQ_SRV	This subclass is used for the BM acquisition service.
MXF_SCLASS_RXSAMPLING_SRV	This subclass is used for the BM sampling service.

Transmission

To get the transmit channel handle, the following subclasses can be used:

Constant	Description
MXF_SCLASS_TX_CHANNEL	Generic transmission channel
MXF_SCLASS_TXPERIODIC_MJRFRAME_SRV	This subclass is used for BC periodic frames transmission.
MXF_SCLASS_TXPERIODIC_UPDATEMSG_SRV	This subclass is used for BC periodic messages update and User periodic messages update transmission.