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University of Southern California, Foundation of Cross-Connection Control and Hydraulic Research (USC-FCCCHR) Manual of Cross-Connection Control - 10th Edition. International Association of Plumbing and Mechanical Officials (IAPMO) Backflow Prevention Reference Manual - 3rd Edition
A digital cross-connect system (DCS or DXC) is a piece of circuit-switched network equipment, used in telecommunications networks, that allows lower-level TDM bit streams, such as DS0 bit streams, to be rearranged and interconnected among higher-level TDM signals, such as DS1 bit streams.
This is an example of a direct cross-connection, with undesirable material being pushed into the system. Back pressure can force an undesirable contaminant to enter potable water piping. Sources of back pressure may be boilers, heat exchanging equipment, power washing equipment, fire sprinklers, or pumps in the water distribution system.
The switch is operated manually with metal pins that create a connection between the horizontally and vertically arranged bars. [1] In electronics and telecommunications, a crossbar switch (cross-point switch, matrix switch) is a collection of switches arranged in a matrix configuration. A crossbar switch has multiple input and output lines ...
A dual check backflow preventer is similar to a double check valve in operation. It has two independent spring-loaded check valves. However, dual check valves usually do not include shutoff valves, may or may not be equipped with test cocks or ports, and is generally less reliable than a double check valve.
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Piping or tubing is usually inserted into fittings to make connections. Connectors are assigned a gender, abbreviated M or F. An example of this is a " 3 ⁄ 4 -inch female adapter NPT ", which would have a corresponding male connection of the same size and thread standard (in this case also NPT).