Dying gasp

A dying gasp is a message (or signal) sent by the customer premises equipment (CPE) to equipment managed by an internet service provider to indicate that the CPE has lost power. Also known as last gasp.

This article is about the type of telecommunications signal. For the last words of a dying person, see Dying declaration. For the sound produced by someone near death, see death rattle.

DSL

DSL device to the digital subscriber line access multiplexer (DSLAM) when a power outage occurs. A DSL interface with dying gasp must derive power for a brief period from another source so that the message can be sent without external power. The dying gasp message will end the session and a new session will be able to be made as soon as power returns and the modem retrains.

Dying Gasp is referenced in section 7.1.2.5.3 of ITU-T Recommendation G.991.2 (12/2003) as the Power Status bit.

Fiber

When an Optical Network Terminal loses power it will send a dying gasp signal to the Optical Line Terminal which will end the session.

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gollark: I live in a mostly sane country and it is quite nice to live in a mostly sane country.
gollark: Yes. Does Coltrans just know everything?
gollark: Why is potato ungood? YOU are the apioformic entity here.
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See also


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