half-duplex repeater
21Physical layer — PHY redirects here. For the drug referred to as Phy, see Methadone. The OSI model 7 Application layer 6 Presentation layer 5 Session layer 4 Transport layer 3 …
22Storm spotter — A storm spotter is a specific type of weather spotter who actively maintains a visual watch of the development and progression of specific weather events while actively relaying important information to the local weather agency in a timely manner …
23Watch — For other uses, see Watch (disambiguation). Early wrist watch by Waltham, worn by soldiers in World War I (Deutsches Uhrenmuseum, Inv. 47 3352) A watch is a small timepiece, typically worn either on the wrist or attached on a chain and carried in …
24AS-Interface — (Actuator Sensor Interface, AS i) is the simplest of the industrial networking protocols used in PLC, DCS and PC based automation systems. It is designed for connecting simple field I/O devices (e.g. binary (ON/OFF) devices such as actuators and… …
25telegraph — telegrapher /teuh leg reuh feuhr/; esp. Brit., telegraphist, n. /tel i graf , grahf /, n. 1. an apparatus, system, or process for transmitting messages or signals to a distant place, esp. by means of an electric device consisting essentially of a …
26steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …
27GSM — For other uses, see GSM (disambiguation). The GSM logo is used to identify compatible handsets and equipment GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard set developed by the European… …
28Television broadcasting in Australia — began on the 16 September 1956 in black and white at TCN 9 in Sydney, and has since expanded to include a broad range of public, commercial, community, subscription, narrowcast and amateur stations across the country.Colour television was… …
29American Photonics — American Photonics, Inc. was a very early developer of LAN technologies based first in Brewster, NY, moving later to Brookfield Center, CT [ [http://www.brookfield.org/ Town of Brookfield, Connecticut 06804 ] ] . American Photonics, Inc., also… …
30Universal Serial Bus — Infobox Computer Hardware Bus name = USB fullname = Universal Serial Bus caption = Original USB Logo invent date = January 1996 width = 1 numdev = 127 per host controller speed = 12 or 480 Mbit/s (1.5 to 60 MByte/s) style = s hotplug = Yes… …
