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A few days later, a black notebook of otherwise similar appearance called the "HP Mini 1000" was informally revealed by a banner on the company's store, and officially announced on 29 October 2008. Unlike the 2133, this device is meant for the home market. An upgrade to the 2133, the HP Mini 2140, was announced by HP in January 2009.
In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.
Even when unmarked, it is generally easy to identify this type of system, because the B phase (circuits #3 and #4) and every third circuit afterwards will be either a three-pole breaker or a blank. Current practice is to give separate services for single-phase and three-phase loads, e.g., 120 V split-phase (lighting etc.) and 240 V to 600 V ...
Simple resistive network with three possible port arrangements: (a) Pole pairs (1, 2) and (3, 4) are ports; (b) pole pairs (1, 4) and (2, 3) are ports; (c) no pair of poles are ports. Any node of a circuit that is available for connection to an external circuit is called a pole (or terminal if it is a physical object).
A shunt-trip unit appears similar to a normal breaker and the moving actuators are ganged to a normal breaker mechanism to operate together in a similar way, but the shunt trip is a solenoid intended to be operated by an external constant-voltage signal, rather than a current, commonly the local mains voltage or DC. These are often used to cut ...
Single-wire earth return (SWER) or single-wire ground return is a single-wire transmission line which supplies single-phase electric power from an electrical grid to remote areas at lowest cost. The earth (or sometimes a body of water) is used as the return path for the current, to avoid the need for a second wire (or neutral wire ) to act as a ...
A new HP notebook similar in appearance to the Mini-Note, called the HP Mini 1000 Vivienne Tam Edition, was unveiled in October 2008, with a launch expected for December that year. [18] The small pink computer is a collaboration with fashion designer Vivienne Tam , and has a 10-inch screen, a 1.6 GHz Intel Atom processor, 1 GB of RAM, and an 80 ...
Modular switches also support additional line cards which can provide new functions to the switch that would previously have been unavailable, such as a firewall. [4] An example of a modular computer network switch is the Cisco Catalyst 6500 , which can be configured with up to 13 slots, and supports connections from RJ45 to QSFP+.