A Professional's Guide to Data Communication in a TCP/IP by E. Bryan Carne

By E. Bryan Carne

A reference consultant to the codes, protocols, networks, signs and gear that give the chance to speak utilizing TCP/IP.

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Extra resources for A Professional's Guide to Data Communication in a TCP/IP World (Artech House Telecommunications Library)

Example text

Notes requests for options. • Passes APDU to port designated for this application. 3 Internet Layer The Internet layer supports a connectionless procedure called Internet Protocol (IP). The output of the layer is a packet called an IP datagram. When sending, the Internet layer: • Accepts the TPDU from the network interface layer. • Provides information on the version of IP in use and the lengths of the Internet header (IH) and IP datagram. • Adds a quality of service level, if required. • Fragments the datagram, if necessary.

To achieve this, each must provide the other with its initial sequence number (ISN). • Must determine the size of the buffer memory the other will provide for the receipt of their PDUs so that they do not send too much data at a time (and lose it). • Must negotiate the maximum size of the segments they exchange so that communication will be as intense as possible. • May negotiate options to satisfy specialized objectives. 1 OPEN Function Calls To create a connection, the sending application issues an active OPEN function call that opens a message queue (port) from the application to the transport layer.

In descending the protocol stack, each layer adds overhead data that manage the communication process. The extended data stream is converted to a sequence of signals that exits from the physical layer of one stack and crosses to the physical layer of the other stack on transmission facilities. There, the signals are converted back to a logical data stream that ascends the protocol stack towards the application layer of the receiving host. At each layer, the data sent by the peer layer in Stack 1 are removed and acted upon.

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