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Power is supplied as a common-mode signal over two or more of the differential pairs of wires found in the Ethernet cables and comes from a power supply within a PoE-providing networking device, such as an Ethernet switch, or by a PoE injector, a PoE power source that can be used in combination with a non-PoE switch.
The telecommunications industry differentiates between several distinct FTTX configurations. The terms in most widespread use today are: FTTE (fiber-to-the-edge) is a networking approach used in the enterprise building (hotels, convention centers, office buildings, hospitals, senior living communities, Multi-Dwelling Units, stadiums, etc.).
ISO/IEC 11801:2002 (Annex E) attempts to internationally standardize the various shielding designations for twisted pair (TP) cables using an explicit two-part abbreviation in the form of x/xTP, where the first x indicates the shielding for the overall cable and the second x indicates the shielding for individual pairs or quads, where each x ...
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I:P – injector to producer ratio; IADC – International Association of Drilling Contractors; IAT – internal active turret; IBC – intermediate bulk container; IC – instrument cable; ICoTA – Intervention and Coiled Tubing Association; ICC – isolation confirmation (or control) certificate; ICD – inflow control device
Common rail fuel system on a Volvo truck engine. In 1916 Vickers pioneered the use of mechanical common rail systems in G-class submarine engines. For every 90° of rotation, four plunger pumps allowed a constant injection pressure of 3,000 pounds per square inch (210 bar; 21 MPa), with fuel delivery to individual cylinders being shut off by valves in the injector lines. [1]
For example, imagine a database where a Building has one or more Rooms, and these Rooms hold zero or more Computers. One might expect to query the model to list all Computers in a Building. However, if a Computer is temporarily not assigned to a Room (perhaps under repair or stored elsewhere), it won't be included in the query results.
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