1.3.3.2.1 Sending Data
If the sender makes a request to send a message that has a data size of no more than 1590 bytes, then a single PDU is sent that contains the message and a header with the Cmd field set to indicate that the PDU type is Data.
If the sender makes a request to send a message that has a data size of more than 1590 bytes, then the DVC manager fragments the message into blocks and can send multiple PDUs. The first PDU contains the first fragment of message data and a header with the Cmd field set to indicate that the PDU type is Data First and the Length field set to the total length of the message the sender is sending. Subsequent PDUs of type Data are sent until the entire message is transmitted.
The receiver does not acknowledge receipt of the data.