Tele Remote Switch
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projectsofme
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#1
02-10-2010, 09:52 AM



.doc   Tele Remote Switch.doc (Size: 1.92 MB / Downloads: 116)
Tele Remote Switch


INTRODUCTION
Controlling devices using switches are common. From a few decades controlling devices using remote control switching like in fared remote control switch wireless remote control switches light activated switches are becoming popular. But these technologies have their own limitation. Laser beams are harmful to mankind.

Some technologies like IR remote control are used for short distance applications. In such case if we have system, which does not require any radiations or which is not harmful, long remote control switch yes here is the solution. Here I am introducing such a system, which does not require any radiations, any laser beam which has no limitation of range, I mean it can be used from any distance from meters to thousand kilometers using a simple telephone line or mobile phone.

Here I am using a telephone as a media, which serves main part of this system, by using home phone as a local phone and another phone, either landing or mobile phone as a remote phone here is a tele remote circuit, which enables switching ON and OFF’ of appliances from any distance overcoming the limited range of infrared and radio remote controls.

Dual-tone multi-frequency signaling (DTMF)
(Dial Pulse or DP in the U.S.) or loop disconnect (LD) signaling to dial numbers. It functions by rapidly disconnecting and re-connecting the calling party's telephone line, similar to flicking a light switch on and off. The repeated interruptions of the line, as the dial spins, sounds like a series of clicks. The exchange equipment interprets these dial pulses to determine the dialed number. Loop disconnect range was restricted by telegraphic distortion and other technical problems, and placing calls over longer distances required either operator assistance (operators used an earlier kind of multi- Prior to the development of DTMF, automated telephone systems employed pulse dialingfrequency dial) or the provision of subscriber trunk dialing equipment. Multi-frequency signaling is a group of signaling methods, that use a mixture of two pure tone (pure sine wave) sounds. Various MF signaling protocols were devised by the Bell System and CCITT. The earliest of these were for in-band signaling between switching centers, where long-distance telephone operators used a 16-digit keypad to input the next portion of the destination telephone number in order to contact the next downstream long-distance telephone operator. This semi-automated signaling and switching proved successful in both speed and cost effectiveness. Based on this prior success with using MF by specialists to establish long-distance telephone calls, Dual-tone multi-frequency (DTMF) signaling was developed for the consumer to signal their own telephone-call's destination telephone number instead of talking to a telephone operator.
Due to DTMF over analog telephone lines in the voice-frequency band between telephone handsets and other communications-terminating devices and the switching center, the previously semi automated system that needed human intervention from a telephone operator, who then dialed a sequence of MF digits that were then routed and switched via automation. AT & Ts Compatibility Bulletin No. 105, AT&T described the product as "a method for pushbutton signaling from customer stations using the voice transmission path." In order to prevent using a consumer telephone to interfere with the MF-based routing and switching between telephone switching centers, DTMF's frequencies differ from all of the pre-existing MF signaling protocols between switching centers: MF/R1, R2, CCS4, CCS5, and others that were later replaced by SS7 digital signaling. DTMF, as used in push-button telephone tone dialing, was known throughout the Bell System by the trademark Touch-Tone. This term was first used by AT&T in commerce on July 5, 1960 and then was introduced to the public on November 18, 1963, when the first push-button telephone was made available to the public. It was AT&T's registered trademark from September 4, 1962 to March 13, 1984,[2] and is standardized by ITU-T Recommendation Q.23. It is also known in the UK as MF4.

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seminar surveyer
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#2
02-10-2010, 11:44 AM

REMOTE SWITCHING:-

To switch ON / OFF a computer through
-Parallel Port Programming
-Bluetooth
-Internet


Attached Files
.ppt   REMOTE SWITCHING.ppt (Size: 612.5 KB / Downloads: 81)
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