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Token Ring (IEEE 802.5)
Category: Computer Networks
Author: Chris Wells
Published: October 9, 2022

Token Ring was developed by IBM in the 1970s and is described in the IEEE 802.5 specification. It is no longer widely used in LANs. ... read more ...


Token Bus (IEEE 802.4)
Category: Computer Networks
Author: Chris Wells
Published: October 9, 2022

Token Bus is described in the IEEE 802.4 specification, and is a Local Area Network (LAN) in which the stations on the bus or tree ... read more ...


ARCNet
Category: Computer Networks
Author: Chris Wells
Published: October 9, 2022

ARCnet is a LAN protocol similar to Ethernet or Token Ring. It was the first widely available networking system for microcomputers, and became popular in ... read more ...


AppleTalk
Category: Computer Networks
Author: Chris Wells
Published: October 8, 2022

AppleTalk is a protocol suite developed by Apple Computer in the early 1980s to allow multiple users to share resources such as files and printers, ... read more ...


Use Case Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 2, 2022

The use case diagram (the word "use" is pronounced as a noun in this context, and not as a verb) is one of the UML'S ... read more ...


Profile Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 2, 2022

A profile allows UML to be extended for use with a particular programming platform (such as Microsoft's .NET framework or the Java Enterprise Edition platform), ... read more ...


Deployment Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 2, 2022

A deployment diagram can be used to model the physical architecture and (in the case of networks or distributed systems) the topology of the software ... read more ...


Component Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 2, 2022

A component is a modular part of a computer software system. It represents a group of related classes and other elements that work together within ... read more ...


Composite Structure Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 1, 2022

Class diagrams can provide us with a lot of generic information about the relationships that exist between classes that work together within complex structures. For ... read more ...


Package Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: October 1, 2022

Let's suppose we have been tasked with modeling a college management system for a large municipal college. As well as its various faculties, the college ... read more ...


Object Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: September 30, 2022

Object diagrams and class diagrams look very similar, because an object is an instantiation (i.e. a specific instance) of a class. Both class diagrams and ... read more ...


Class Diagrams
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: September 30, 2022

A class diagram describes the structure of a system (or part of a system) in terms of the classes that exist within the system and ... read more ...


What is UML?
Category: The Unified Modelling Language (UML)
Author: Chris Wells
Published: September 30, 2022

The Unified Modeling Language (UML) is a graphically based specification language for modeling software-intensive systems that has, since the late 1990s, become a de facto ... read more ...


Control Network Reliability Issues
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

Data communications networks usually exist within an environment that is designed to accommodate people, with consequently little variation in temperature or humidity. Industrial control systems ... read more ...


ControlNet
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

ControlNet is a real-time, open communications protocol used in industrial automation applications, and like DeviceNet is an implementation of CIP. The ControlNet specification was maintained ... read more ...


DeviceNet
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

DeviceNet is an open communications protocol used in industrial automation to interconnect I/O and control devices. DeviceNet was originally developed by Allen Bradley (now owned ... read more ...


Common Industrial Protocol
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

In the past, automation fieldbus protocols have tended to be application-specific, making them very efficient at what they do but limiting the roles for which ... read more ...


Controller Area Network (CAN)
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

Controller Area Network (CAN) started life in 1983 at Robert Bosch GmbH as a serial data bus standard for the interconnection of microcontrollers in vehicles. ... read more ...


Control Network Models
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

Traditional industrial networking technologies such as Profibus and Modbus use a source-destination model of networking in which data is sent separately to each device on ... read more ...


MODBUS
Category: Industrial Control Networks
Author: Chris Wells
Published: September 30, 2022

MODBUS is an open, de-facto application layer communications protocol used for the supervision and control of automation equipment. MODBUS was originally developed in the late ... read more ...