Explain about dial pulses, Electrical Engineering

Assignment Help:

Q. Explain about Dial Pulses?

Dial pulsing (sometimes known as rotary dial pulsing) is the method basically used to transfer digits from a telephone set to the local switch. Pulsing digits from a rotary switch began soon after invention of the automatic switching machines. Concept of dial pulsing is quite simple and is depicted in figure. Process begins when telephone set is lifted off hook, completing a path for current through the local loop. When switching machine detects off-hook condition, it responds with dial tone. After hearing the dial tone, subscriber begins the dial pulsing digits by rotating a mechanical dialing mechanism and then letting it returns to its rest position. As rotary switch returns to its rest position, it outputs a series of dial pulses corresponding to digit dialed. Whenever a digit is dialed, loop circuit alternately opens (breaks) and closes (makes) a prescribed number of times. Number of switch make/break sequences corresponds to digit dialed (which is the digit 3 produces three switch openings and three switch closers). Dial pulses take place at 10 make/break cycles per second (it implies that a period of 100 ms per pulse cycle). For illustration, digit 5 corresponds to five make/break cycles lasting a total of 500ms. Switching machine senses and counts number make/break pairs in the sequence.

1946_Explain about Dial Pulses.png


Related Discussions:- Explain about dial pulses

Ac motors, If the stator windings of an alternator were to be supplied ...

If the stator windings of an alternator were to be supplied by an AC of frequency f (as opposed to drawing an AC current from them as would be the case for an alternator) then

Basic working of star topology, Q. Basic working of Star Topology? In S...

Q. Basic working of Star Topology? In Star topology, all user nodes are connected to central node point that interconnects all individual users links and nodes. Data flows from

Define the perspective transformation, Define the application of CAM/CAD to...

Define the application of CAM/CAD to engineering design along with its benefits. a) A triangle is prepared by three position vectors A[2 4 1], B[4 6 1], C[2 6 1], get the reflec

Illustrate the concept of part families, (a) Illustrate the concept of Part...

(a) Illustrate the concept of Part Families ? (b) Explain briefly the general process to solve the problem of grouping the parts into families.

Explain the advantage of synchronous counters, Explain the Advantage of Syn...

Explain the Advantage of Synchronous Counters? The most significant advantage of synchronous counters is that there is no cumulative time delay because all flip-flops are trigg

Describe flat plate collectors, Describe flat plate collectors. Explain liq...

Describe flat plate collectors. Explain liquid flat plate collector with relevant diagram. Describe different types of absorbing surface areas with diagram. Also discuss their r

Explain ramp type dvm, SOL. Ramp Type VM: The operating principle of the r...

SOL. Ramp Type VM: The operating principle of the ramp type DVM is based on the measurement of the time it takes for a linear ramp voltage to rise from 0 V to the level of the inp

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd