TPDU
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TPDU is an acronym for Transport Protocol Data Unit. TPDU is commonly used in the banking/financial transaction processing industries. Many vendors have used the basic concept and added their own variations. In general, the TPDU is a message encapsulation format where there are several bytes of routing header added to the front of the payload message.
A TPDU header is 5 bytes in length and consists of 1 byte message type, 2 bytes destination address, 2 bytes source address. Each byte represents 2 BCD digits. A TPDU header is sometimes erroneously referred to as a TPDU.
OSI-model: A TPDU is the name for the messages that the protocols in the transport layer of the OSI-model use for communication. It adds a transport header to the APDU to make a TPDU which is then sent to Network layer. Most protocols will implement a CONNECT, SEND and DISCONNECT TPDU.
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