Cadmium is a common impurity in zinc ores, and it is most often isolated during the production of zinc. Some zinc ores concentrates from sulfidic zinc ores contain up to 1.4% of cadmium. In the 1970s, the output of cadmium was 6.5 pounds per ton of zinc.admium and its congeners are not always considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states. The average concentration of cadmium in Earth's crust is between 0.1 and 0.5 parts per million (ppm).
A subnetwork, or subnet, is a logical, visible subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. Computers that belong to a subnet are addressed with a common, identical, most-significant bit-group in their IP address.
Definition - What does Attached Resource Computer Network (ARCNET) mean? Attached Resource Computer Network (ARCnet) is a type of LAN protocol that provides network services to 255 nodes at data rates of up to 2.5 Mbps. ARCnet is similar to token ring and Ethernet network services. ARCnet was fast, reliable and cheap, and it allowed different transmission systems to be merged and implemented on same network. ARCnet was the first simple networking based solution that provided for all kinds of transmission regardless of the transmission medium or the type of computer. ARCnet was also the first widely available networking system for microcomputers.