Reti Ethernet a efficienza energetica per applicazioni industriali. Parte A: lo standard IEEE 802.3az

Nel 2010 è stato pubblicato da parte dell'Institute of Electrical and Electronics Engineers (IEEE) l'emendamento 802.3az, volto ad aumentare l'efficienza energetica delle reti Ethernet. Tale standard, chiamato Energy Efficient Ethernet (EEE), introduce una nuova modalità operativa, denominata Low Power Idle (LPI), che riduce notevolmente il consumo energetico della scheda Etherne

Just a Second -- Scheduling Thousands of Time-Triggered Streams in Large-Scale Networks

Deterministic real-time communication with bounded delay is an essential requirement for many safety-critical cyber-physical systems, and has received much attention from major standardization bodies such as IEEE and IETF. In particular, Ethernet technology has been extended by time-triggered scheduling mechanisms in standards like TTEthernet and Time-Sensitive Networking. Although the scheduling mechanisms have become part of standards, the traffic planning algorithms to create time-triggered schedules are still an open and challenging research question due to the problem's high complexity. In particular, so-called plug-and-produce scenarios require the ability to extend schedules on the fly within seconds. The need for scalable scheduling and routing algorithms is further supported by large-scale distributed real-time systems like smart energy grids with tight communication requirements. In this paper, we tackle this challenge by proposing two novel algorithms called Hierarchical Heuristic Scheduling (H2S) and Cost-Efficient Lazy Forwarding Scheduling (CELF) to calculate time-triggered schedules for TTEthernet. H2S and CELF are highly efficient and scalable, calculating schedules for more than 45,000 streams on random networks with 1,000 bridges as well as a realistic energy grid network within sub-seconds to seconds

Reti Ethernet a efficienza energetica per applicazioni industriali. Parte B: le misure in laboratorio

Nel 2010 è stato pubblicato da parte dell'Institute of Electrical and Electronics Engineers (IEEE) l'emendamento 802.3az. Tale standard, chiamato Energy Efficient Ethernet (EEE), introduce una nuova modalità operativa, denominata Low Power Idle (LPI), che riduce notevolmente il consumo energetico della scheda Ethernet. In questa tesi sono illustrate alcune misurazioni sulla scheda Ethernet Intel I210-T1 per verificare che rispetti lo standardope