1.3.3.2.2 Receiving Data
If a message has been fragmented, the first data PDU received will be of type Data First. If the message has not been fragmented, the first and only PDU for this message will be of type Data.
When a DVC manager receives a Data First PDU, it saves the message data and continues receiving Data PDUs until all the data is received. The DVC manager then reassembles the data and passes the data to the receiver associated with this channel.
When a DVC manager receives a Data PDU that has not been preceded by a Data First PDU, it passes the message data directly to the receiver without any additional processing.
The DVC manager does not acknowledge receipt of the data.