Adying 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.[1] Also known as last gasp.
A DSL device will send a dying gasp signal to the digital subscriber line access multiplexer (DSLAM) when a power outage occurs.[2] 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.[3] 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.[citation needed]
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.[citation needed]
When an optical network terminal loses power it will send a dying gasp signal to the optical line terminal which will end the session.[4]
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