Dying 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.

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.^[1] 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.^[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]}

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.^[4]

See also

• Passive optical network

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

• ITU-T Recommendation G.991.2: Single-pair high-speed digital subscriber line (SHDSL) transceivers