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
editA 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
editWhen 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
editReferences
edit- ^ Padmanand Warrier; Balaji Kumar (2000). XDSL architecture. McGraw Hill. p. 147. ISBN 9780071350068.
- ^ Thomas Starr; John M. Cioffi; Peter Silverman (1999). Understanding Digital Subscriber Line Technology. Prentice Hall. p. 360. ISBN 9780137805457.
- ^ Chris Hellberg; Truman Boyes; Dylan Greene (2007). Broadband Network Architectures; Designing and Deploying Triple-Play Services. Pearson Education. p. 258. ISBN 9780132704519.
- ^ 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
edit
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