DCN communication protocols
Communication protocols used in the data communication network (DCN) between the
nodes include:
•
Ethernet (on the 10BASE-T) LAPD (on the DCC channels)
•
OSI network protocol (DCN wide)
The OSI network protocol (OSI-DCN) is used for routing management data between
nodes in the DCN.
ISO-OSI network protocol
The network protocol used between nodes is the ISO-OSI network protocol (ISO/IEC
8648). According to this protocol a node in the network can behave as an end system
(ES) or as an intermediate system (IS), sometimes called a router.
End systems (ES)
Nodes behaving as
end systems (ES) perform no forwarding of data packets. They
communicate with each other on an end-to-end basis via intermediate systems.
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