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About: Emergency Stand Alone     Goto   Sponge   NotDistinct   Permalink

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Emergency Stand Alone (ESA) is a term used by the vendors of telephone equipment such as Nortel DMS-100, Lucent 5ESS or GTD-5. Typically, small towns or communities have telephone services provided from a "remote switching unit" which is controlled by the more powerful host switching complex. ESA occurs when the host/remote links are severed, thus leaving the region in “community isolation”. While in the ESA mode, the town/community is limited to only receiving or placing calls within that community/town. * v * t * e