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

The following Channel Subclass values for bus function are available for the ARINC 629 protocol.

Bus Function

Constant	Description
MXF_SCLASS_BM_CHANNEL	Bus Monitor
MXF_SCLASS_RT_CHANNEL	Remote Terminal

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 RT periodic frames transmission.
MXF_SCLASS_TXPERIODIC_UPDATEMSG_SRV	This subclass is used for RT periodic messages update transmission.