Leith Campbell

A Layered Approach To Network Management Control

Public telecommunications networks have many supporting operations systems to provide network management functions and operational support. These systems must be coordinated to provide a highly reliable network service and to make best use of network resources. With increasing automation of network control, these systems must evolve to provide total network support. One organizing principle for this evolution is the definition of control layers at which individual control functions are exercised. We describe a proposal for layered control, with particular emphasis on the role of network traffic management. Layering will be a significant study item for the next extensions to CCITTs Telecommunications Management Network (TMN) recommendations.

Fairness under sustained overload in a DQDB subnetwork with eraser nodes

Fairness criteria are proposed for the apportionment of throughput among the different stations for a DQDB (distributed-queue dual-bus) subnetwork involving eraser nodes under sustained overload. These criteria are based on maximizing the minimum throughput available to any station. Idealistic values of capacity apportionment for each active station are analytically computed by a recursive procedure. These idealistic values provide a quantitative standard against which the fairness of proposed eraser node protocols may be assessed. A numerical example is used to provide a detailed demonstration of the method for capacity apportionment.<<ETX>>

A layered approach to network management control

Public telecommunications networks have many supporting operations systems to provide network management functions and operational support. These systems must be coordinated to provide a highly reliable network service and to make best use of network resources. With increasing automation of network control, these systems must evolve to provide total network support. One organizing principle for this evolution is the definition of control layers at which individual control functions are exercised. We describe a proposal for layered control, with particular emphasis on the role of network traffic management. Layering will be a significant study item for the next extensions to CCITTs Telecommunications Management Network (TMN) recommendations.

Should my toaster be polled? Towards an energy-efficient Internet of Things

In the future Internet of Things, many common household devices will have communications interfaces added. We investigate energy-efficient design options for such communications interfaces in the Internet of Things through the example of a simple stock control application that may be commercially implemented. We have measured the power consumption of several popular wireless interfaces - 433 MHz module (RF433), Bluetooth, Wi-Fi and ZigBee - and we show how an energy-efficient communications paradigm can be designed in each case. This is a contribution to design guidelines for energy-efficient communication in the Internet of Things as it expands to encompass all consumer devices.