number unobtainable signal

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• Call-progress tone — In telephony, call progress tones are audible tones sent from the PSTN or a PBX to calling parties to indicate the status of phone calls. Equipment such as fax machines and modems are designed to recognise dial tones and busy tones.The ITU T… …   Wikipedia

• Disconnect tone — A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. Typically, the disconnect tone is a few cycles of the reorder or busy tone (e.g. in US), or between five and fifteen seconds of… …   Wikipedia

• Nutone — may refer to: Nutone Records, a Canadian record label Nu:Tone, an English drum and bass musician NuTone, an American manufacturing company (for residential use) Number unobtainable tone (also known as NU tone), a telephony signal This… …   Wikipedia

• stage design — Aesthetic composition of a dramatic production as created by lighting, scenery, costumes, and sound. While elements such as painted screens and wheeled platforms were used in the Greek theatre of the 4th century BC, most innovations in stage… …   Universalium

• space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …   Universalium

• Economic Affairs — ▪ 2006 Introduction In 2005 rising U.S. deficits, tight monetary policies, and higher oil prices triggered by hurricane damage in the Gulf of Mexico were moderating influences on the world economy and on U.S. stock markets, but some other… …   Universalium

• HISTORICAL SURVEY: THE STATE AND ITS ANTECEDENTS (1880–2006) — Introduction It took the new Jewish nation about 70 years to emerge as the State of Israel. The immediate stimulus that initiated the modern return to Zion was the disappointment, in the last quarter of the 19th century, of the expectation that… …   Encyclopedia of Judaism

• Embedded system — Picture of the internals of an ADSL modem/router. A modern example of an embedded system. Labelled parts include a microprocessor (4), RAM (6), and flash memory (7). An embedded system is a computer system designed to do one or a few dedicated… …   Wikipedia

• Simultaneous substitution — For the US equivalent to this practice, see Syndication exclusivity. The View as it appears on ABC in Canada before and after simultaneous substitution is implemented as requested by CTV. Note the appearance of CTV s bug in the lower right corner …   Wikipedia

• Ring Ring (song) — Infobox Single Name = Ring Ring (Bara Du Slog En Signal) Artist = Björn Benny, Agnetha Anni Frid from Album = Ring Ring B side = Åh vilka tider Released = February 14, 1973 Format = 7 Single Genre = Pop Length = 3:00 Producer = Polar Writer =… …   Wikipedia

• Schools — • History and development of education as related to the church Catholic Encyclopedia. Kevin Knight. 2006. Schools     Schools     † …   Catholic encyclopedia