Alarm indication signal

Alarm indication signal

Alarm indication signal (AIS) is a signal transmitted by a system that is part of a concatenated telecommunications system to let the receiver know that some remote part of the end-to-end link has failed at a logical or physical level, even if the system it is directly connected to is still working. Other systems attached to a system transmitting AIS then relay the AIS indication onwards to other systems.

There are a number of types of AIS signals, which signal failure of different logical or physical segments of the system, including:
* Alarm indication signal path (AIS-P)
* Alarm indication signal line (AIS-L)

Middle 20th century analog carrier systems had Carrier Group Alarms by which the failure of a pilot signal was alerted to telephone exchange equipment, imposing an automated make-busy condition so the trunks carried by the failed system would not be used. The improved AIS originated with the T-carrier system, and became a standard feature of subsequent plesiochronous and synchronous circuit-based communication systems, and is also part of the ATM standards.As the use of Ethernet for long-distance data links has increased, the need for a similar end-to-end OA&M function has led to the development of a similar Ethernet alarm indication signal (EthAIS).

See also

* concatenation (telecommunications)


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Alarm Indication Signal — Dieser Artikel oder Abschnitt bedarf einer Überarbeitung. Näheres ist auf der Diskussionsseite angegeben. Hilf mit, ihn zu verbessern, und entferne anschließend diese Markierung …   Deutsch Wikipedia

  • Digital Signal 1 — (DS1, sometimes DS 1) is a T carrier signaling scheme devised by Bell Labs.[1] DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside North… …   Wikipedia

  • signal — [adj] extraordinary, outstanding arresting, arrestive, characteristic, conspicuous, distinctive, distinguished, eminent, exceptional, eye catching, famous, illustrious, individual, marked, memorable, momentous, notable, noteworthy, noticeable,… …   New thesaurus

  • Indication — (Roget s Thesaurus) < N PARAG:Indication >N GRP: N 1 Sgm: N 1 indication indication Sgm: N 1 symbolism symbolism symbolization Sgm: N 1 semiology semiology semiotics semeiology semeiotics Sgm: N 1 Zeitgeist Zeitgeist …   English dictionary for students

  • Alarm — (Roget s Thesaurus) >Indication of danger. < N PARAG:Alarm >N GRP: N 1 Sgm: N 1 alarm alarm Sgm: N 1 alarum alarum larum alarm bell tocsin alerts beat of drum sound of trumpet note of alarm hue and cry fire cros …   English dictionary for students

  • Alarm — An alarm (French: À l arme To the arms ) gives an audible or visual warning of a problem or condition.Alarms include: * burglar alarms, designed to warn of burglaries; this is often a silent alarm: the police or guards are warned without… …   Wikipedia

  • indication — I (New American Roget s College Thesaurus) Directing attention to; implication Nouns 1. indication; symbolism, symbolization; denotation, connotation, signification; specification, designation; sign, symbol; index, indicator; dial; point[er],… …   English dictionary for students

  • signal — Synonyms and related words: ALGOL, COBOL, CRT spot, DM display, Doppler signal, EDP, FORTRAN, IF signal, IM display, RF echoes, Roman candle, Teletype, Wirephoto, aid to navigation, alarm, alert, alphabetic data, alphanumeric code, amber light,… …   Moby Thesaurus

  • signal — I (New American Roget s College Thesaurus) n. sign, watchword, cue; alarm, warning, direction, order; traffic light, beacon, foghorn, wigwag; trace, vestige. See indication. adj. memorable, conspicuous, momentous. See importance. v. t. signalize …   English dictionary for students

  • signal — n 1. sign, marker, guidepost, milepost, milestone, landmark, seamark; beacon, light, flag, warning light, caution light, flare, rocket; monitor, pilot, gauge, meter, instrument; alert, warning, siren, whistle, alarm, Archaic. alarum, horn, toot,… …   A Note on the Style of the synonym finder

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”