J
jack A socket containing a number of spring-loaded contacts which mate with the corresponding contacts of a plug inserted in the jack. The contacts within the jack can be arranged to make or break particular circuits when the plug is inserted as shown in the graphical symbols in Figure J.1. Plugs and jacks are extensively used in telephone switchboards and in broadcasting to permit rapid connections to be made to equipment or circuits.
Figure J.1 (a) A three-pole plug and jack connecting two wires and earth and (b) a break-jack. At (b) the contact between a and b and between c and d is broken when the plug is inserted
jamming Deliberate ...
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