# Dry loop

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{{Short description|Unconditioned leased pair of telephone line}}
{{refimprove|date=November 2022}}

A '''dry loop''' is an unconditioned [leased pair](/source/Leased_line) of [telephone line](/source/telephone_line) from a [telephone company](/source/telephone_company).<ref>{{cite book |title=Linux programming unleashed |date=2001 |publisher=Sams |location=Indianapolis, Ind. |isbn=0672320215 |pages=32 |edition=2nd}}</ref> The pair does not provide [dial tone](/source/dial_tone) or [battery](/source/battery_(electricity)) (continuous [electric potential](/source/electric_potential)), as opposed to a '''wet pair''', a line usually without dial tone but with battery.<ref>{{cite web |title=Telephone interfacing circuits |url=https://www.epanorama.net/circuits/teleinterface.html |website=www.epanorama.net}}</ref>

A dry pair was originally used with security systems but more recently may also be used with [digital subscriber line](/source/digital_subscriber_line) (DSL) service or an [Ethernet extender](/source/Ethernet_extender) to connect two locations, as opposed to a costlier means such as a [Frame Relay](/source/Frame_Relay). The pair in many cases goes through the local [telephone exchange](/source/telephone_exchange).

''Wet pair'' naming comes from the battery used to sustain the loop, which was made from wet cells.

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-premises extension) line, '''paging circuit''', or finally '''LADS''' ('''local area data service''').

==Local availability==
In the [United States](/source/Communications_in_the_United_States), these circuits typically incur a monthly recurring charge of $3.00 per ¼ mile (approximately), plus an additional handling fee of around ($5–10).{{when|date=January 2023}}

In Canada, a CRTC ruling {{As of|2003|07|21|lc=y }} requires telcos (such as [Bell Canada](/source/Bell_Canada)) permit dry loop and some companies do provide this service. [Naked DSL](/source/Naked_DSL) is currently provided by third-party DSL (digital subscriber line) vendors in the provinces of Ontario and Quebec, but incurs an additional dry loop fee (often $5 or more monthly, depending on the distance from the exchange). There is not yet widespread adoption, as this extra fee often renders dry-loop DSL more costly than comparable [cable modem](/source/cable_modem) service in most locations. A Bell Canada "dry loop" DSL connection does supply battery, but the underlying phone line is non-functional except to call [958-ANAC](/source/automatic_number_announcement_circuit) (It may also be possible to call [9-1-1](/source/9-1-1) or the 310-BELL telco business office on a dry loop, however many regions do not support this).

==See also==
*[Current loop](/source/Current_loop)
*[Local-loop unbundling](/source/Local-loop_unbundling)
*[Naked DSL](/source/Naked_DSL)
*[Permitted attached private lines](/source/Permitted_attached_private_lines)

== References ==
{{Reflist}}

Category:Local loop

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Adapted from the Wikipedia article [Dry loop](https://en.wikipedia.org/wiki/Dry_loop) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Dry_loop?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.