dying gasp
{{Short description|Message sent by a CPE to an ISP to indicate it has run out of power}}
{{about|the type of telecommunications signal|the last words of a dying person|Dying declaration|the sound produced by someone near death|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.{{cite book |url=https://books.google.com/books?id=7AofAQAAIAAJ |page=147 |title=XDSL architecture |author1=Padmanand Warrier |author2=Balaji Kumar |year=2000 |isbn=9780071350068 |publisher=McGraw Hill}} 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.{{cite book |url=https://books.google.com/books?id=gQ5TAAAAMAAJ |page=360 |title=Understanding Digital Subscriber Line Technology |author1=Thomas Starr |author2=John M. Cioffi |author3=Peter Silverman |year=1999 |isbn=9780137805457 |publisher=Prentice Hall}} 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.{{cite book |url=https://books.google.com/books?id=M3V-YveAYYwC&pg=PT258 |page=258 |title=Broadband Network Architectures; Designing and Deploying Triple-Play Services |author=Chris Hellberg |author2=Truman Boyes |author3=Dylan Greene |year=2007 |isbn=9780132704519 |publisher=Pearson Education}} 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.{{cn|date=July 2022}}
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.{{cn|date=July 2022}}
==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.{{cite book |url=https://books.google.com/books?id=dLdovRLxm4oC&pg=PA112 |page=112 |title=Broadband Access and Network Management: NOC '98 - Networks and Optical Communication |author1=D. W. Faulkner |author2=A. L. Harmer |publisher=IOS Press |year=1998|isbn=9789051994001 }}
See also
References
{{reflist}}
External links
- [http://www.itu.int/rec/T-REC-G.991.2/en ITU-T Recommendation G.991.2: Single-pair high-speed digital subscriber line (SHDSL) transceivers]
Category:Digital subscriber line
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