Download - Troubleshooting Industrial Ethernet & TCP/IP Networks

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Troubleshooting Industrial Ethernet & TCP/IP Networks

Technology Training that Workswww.idc-online.com/slideshare

Topics LAN and WAN OSI Reference Model Troubleshooting Methodology


Local Area Network

is a communications system is constrained within an organisation is privately owned covers about 2 to 3 km maximum will include:-

workstations, servers & peripherals a shared access medium


Wide Area Network WAN

Elements are separated by distances that require telecommunications links Publicly or privately owned Shared lines - packet & circuit switched Leased lines - dedicated connection Distance can be global - 1000s+ km Slow to medium speed (now) cf LANs High error rates (1 in 1 Mbits)

Open Systems and Communications

Specifications open to all ISO defined OSI Model (1978) 7 Layers Not a Protocol but an overall framework

Protocols can be developed for layers independently


OSI Model


OSI Model - Functions of layers

Application Network services to user

application

Presentation Converts data between

application formats

Session Control communications

sessions Map name to addresses

Transport Manage communications

between end systems

Network Inter-network routing Fragmentation of packets

Data Link Assembly and disassembly

of message frames

Physical Electrical & mechanical


OSI Message Passing

Application

Presentation

Session

Transport

Network

Data Link

Physical

Protocol ControlInformation (PCI)

User Message

DLT

DLT Post



Troubleshooting Methodology

Most problems occur in lowest layers Systematically check these first Many problems with cables and Physical layer

broken wires, connector issues and noise Data Link Layer

Ethernet interfaces, switches Network layer

IP configuration, routers and firewalls


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