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 system, 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 for basic analog loop or in some locales PANA for plain analog loop, OPX (off-premise extension) line, paging circuit, or finally LADS (local area data service).
Pricing
In the United States, these circuits typically incur a monthly recurring charge (MRC) of $3.00 per 1/4 mile, plus an additional handling fee ($5-10).
See also
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