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Dying gasp

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Message sent by a CPE to an ISP to indicate it has run out of power 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.

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

DSL

A DSL device will send a dying gasp signal 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.

See also

References

  1. Padmanand Warrier; Balaji Kumar (2000). XDSL architecture. McGraw Hill. p. 147. ISBN 9780071350068.
  2. Thomas Starr; John M. Cioffi; Peter Silverman (1999). Understanding Digital Subscriber Line Technology. Prentice Hall. p. 360. ISBN 9780137805457.
  3. Chris Hellberg; Truman Boyes; Dylan Greene (2007). Broadband Network Architectures; Designing and Deploying Triple-Play Services. Pearson Education. p. 258. ISBN 9780132704519.
  4. D. W. Faulkner; A. L. Harmer (1998). Broadband Access and Network Management: NOC '98 - Networks and Optical Communication. IOS Press. p. 112. ISBN 9789051994001.

External links


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