Interconnecting heterogeneous devices, that is, devices with varying capabilities, has raised new challenges in the design of network protocols. This paper describes the design of the Flexible Interconnecting Protocol, or FLIP, whose goal is to interconnect heterogeneous devices. FLIP is a jlexible protocol that addresses the needs of heterogeneous networks: it incurs little overhead when run by siniple devices, while still providing a range of functions that can be pegormed by more sophisticated devices.We describe a simpliJ5ed implementation of FLIP under Linux. We also conducted a preliminary evaluation of FLIP's overhead and functionality in the context of IP (IPv4 and IPv6) and sensor network environments. FLIP incurs reasonably low overhead when providing IPv4 and IPv6 functionality (1 and 3 bytes respectively), yet it does particularly well in the case of small payloads. When compared to a sensor-specijic protocol, FLIP incurs a small overhead increase while still providing full protocol@nctionality.
Shielding twisted pair with metallic tape is a widely used resource to reduce the electromagnetic emissions and increase noise immunity of the twisted pair to those emissions. But, in addition to decrease electromagnetic emissions, shield also affects electric and geometry characteristics of the pair. Estimation of twisted pair geometry is vital to compute as much as the shield affects the electric characteristics of the pair.The goal of this paper is to develop a model of shielded twisted pair which allows to compute the shield shape as a function of twisted properties of the pair and physical characteristics of the shield tape. The model calculated in this paper is a part of a large work research; with the results of that research we can calculate the most used electric characteristics of the pair according to the physical and geometrical characteristics of it. This research was applied in an important cable manufacturing company of the automotive sector.
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