100 line exchange with two-motion line finders, Electrical Engineering

In this design, there are 24 line finders. If any of the 100 subscribers has to get access to any of 24 two-motion selectors, it is necessary that every line finder is capable of reaching any of the 100 subscribers. In other words, every line finder should have 100 outlets. For this purpose, two motion selectors have to be used as line finders. Configuration is displayed in figure. Corresponding outlets of the line finders are commoned. In the same way, outlets of the numerical selectors are also commoned.

When start condition is received, line finder is caused to hunt vertically until wipers reach a marked level. Vertical hunting is then stopped and horizontal hunt commences to find a particular marked contact in that level. It may be noted that in extreme case, line finder may have to take 20-steps -10 vertical and 10 horizontal -before a line is found. Line finders are made to step automatically, using interrupter contact mechanism. When line finder locates the subscriber line, start condition is removed, allotter switch steps on to the next free line finder in readiness for further calls and numerical selector sends out the dial tone to subscriber in readiness to receive dialling pulses. Thereafter establishment of the connection proceeds in usual manner.

Apparently, Design 3 is by far the best for a 100-line exchange. If we had used Uni-selectors as line finders, it would have been essential to divide subscriber's line into small groups of, say 24 each. Such designs involving groupings, functionefficiently only under certain specific traffic conditions and usually result in higher blocking probabilities.

274_100 Line exchange with two-motion line finders.png

Posted Date: 8/23/2013 3:48:43 AM | Location : United States







Related Discussions:- 100 line exchange with two-motion line finders, Assignment Help, Ask Question on 100 line exchange with two-motion line finders, Get Answer, Expert's Help, 100 line exchange with two-motion line finders Discussions

Write discussion on 100 line exchange with two-motion line finders
Your posts are moderated
Related Questions
Calculate total resistance among terminal A and B for the circuit below.

Write an m-file "myfourier.m" which takes two images, computes FFT, phase and amplitude and swaps the amplitudes between two images. function myfourier im1=imread('cameraman.pn

Q.   What are the different types and uses of delay line in CRO? OR Why is a delay line used in the vertical section of the oscilloscope? Sol. All electronic circui

Q. A rotating electric machine with uniform air gap has a cylindrical rotor winding with inductance L 2 =1 H and a stator winding with inductance L 1 =3H. Themutual inductance va

A single-phase source delivers 100 kW to a load operating at 0.8 lagging power factor. In order to improve the system's efficiency, power factor improvement (correction) is achieve

Can I find out the salution of electrods Transmission medium light sound uncoupling magnet for high dc cycle.

Q. Consider the op-amp circuit shown in Figure and obtain expressions for the open-loop voltage gain at (a) low and (b) high frequencies. Also determine relations for the 3-dB poin

What is the use of basic earth-sun angles? Show by mean of diagram. Illustrate sun as source of energy with relevant data? Illustrate flat plate collectors. Describe liquid f

In the magnetic circuit shown in Figure (a) the coil of 500 turns carries a current of 4 A. The air-gap lengths are g 1 = g 2 = 0.25 cm and g 3 = 0.4 cm. The cross-sectional are

Two identical three-phase, 33-kV, wye connected, synchronous generators operating in parallel share equally a total load of 12 MW at 0.8 lagging power factor. The synchronous react