Patent ID: 8605754

Claim:
A method of messaging in a railroad communications system comprising: generating a message with at an application layer implemented in a message processing system, the message associated with a message handling code; passing the message and the message handling codes to a transport layer implemented within the message processing system; fragmenting the message into a least one fragment at the transport layer; passing the fragmented message and message handling codes to a network layer implemented within the message processing system; selectively segmenting the fragmented message at the network layer as indicated by the message handling code; passing the selectively segmented message and the message handling code to a link layer implemented within the message processing system; forming a packet from the selectively segmented at the link layer, the packets including packet type information and data parts; passing the packet to a physical layer implemented within the message processing system; adding a preamble to the packet at the physical layer; and transmitting the preamble and packet with a radio forming a part of the message processing system.