An alarm circuit (also dry pair or dry loop) is an unconditioned leased pair of telephone wire from a telco. The pair does not have a dial-tone or "battery" (continuous electric potential), as opposed to a "wet pair" (a line usually with no dial tone but with battery). A dry pair is normally used with a security systems, but more recently may also be used with DSL equipment or an ethernet extender to connect two locations, as opposed to a costlier means such as frame relay. The pair in many cases goes through the local central office. Many carriers market dry loops to independent DSL providers, as a BANA or basic analog loop. A telephone line (or just line) is a single-user circuit on a telephone communications system. ... TATA Engineering and Locomotive Company A telephone company (or telco) provides telecommunications services such as telephony and data communications. ... A dial tone is a telephony signal used to indicate that the telephone exchange is working and ready to accept a call. ... Electric potential is the potential energy per unit of charge associated with a static (time-invariant) electric field, also called the electrostatic potential, typically measured in volts. ... In the context of computer networking, frame relay (also found written as frame-relay) consists of an efficient data transmission technique used to send digital information quickly and cheaply in a relay of frames to one or many destinations from one or many end-points. ... In the field of telecommunications, a central office or telephone exchange houses equipment that is commonly known as simply a switch, which is a piece of equipment that connects phone calls. ...
Pricing
These circuits usually average an MRC of $3.00 per 1/4 mile, plus an additional handling fee($5-10) in the United States.
See also
4-20 mA
4-20 ma is an analog electrical transmission standard for industrial instrumentation. ...
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