Find farthest distance from exchange where subscriber locate, Computer Engineering

Assignment Help:

An exchange uses a -40 V battery to drive subscriber lines. A resistance of 250 ohms is placed in series with the battery to protect it from short circuits. The subscribers are required to use a standard telephone set which offers a dc resistance of 50 ohms. The microphone requires 23mA for proper functioning given DC resistance of 133 ohms/km, find the farthest distance from the exchange at which the subscriber can be located.

Let R be the line loop resistance, by using the relation

I = V/R

The value of R can be determined as

23 x 10 = 40/ (250+50+R)

R = 1439

For 26 AWG wire R =133.89

Loop length= 1439/133.

Hence, the farthest distance at that the subscriber can be located is

10.74/2 = 5.37 km


Related Discussions:- Find farthest distance from exchange where subscriber locate

Explain topology method used in lan technology in detail, Explain topology ...

Explain topology method used in LAN technology in detail. LAN Topologies: Network topology is a physical schematic that shows interconnection of the various users. There are

Convert ascii code to its bcd equivalent, Convert ASCII code to its BCD equ...

Convert ASCII code to its BCD equivalent. This can be achieved by simply replacing bits in upper four bits of byte by four zeros. For illustration the ASCII '1' is 32h = 0010B. By

Explain rby and cmyk colour printing, Q. Explain RBY and CMYK colour Printi...

Q. Explain RBY and CMYK colour Printing? For good printing printers don't use RBY in place of that they use CMYK (Cyan instead of Blue, Magenta instead of Red, Yellow and a sep

How a direct inward dialling is utilized, Direct inward dialling is used as...

Direct inward dialling is used as a feature in? Direct inward dialling is utilized as a feature in EPABX.

Show the developments that happened in third generation, Q. Show the develo...

Q. Show the developments that happened in third generation? The main developments that happened in third generation can be summarized as below: Application of IC circuit

what is a persistent cookie in php, A persistent cookie is a cookie which ...

A persistent cookie is a cookie which is keeps in a cookie file permanently on the browser's computer. By default, cookies are formed as temporary cookies which keep only in the br

What is data hazard in pipelining, What is data hazard in pipelining? What ...

What is data hazard in pipelining? What are the solutions? A data hazard is a situation in which  the pipeline is stalled due to the data to be operated on are delayed for some

Manipulate the presentation and attributes interactive list, How can you m...

How can you manipulate the presentation and attributes of interactive lists? ---Scrolling by Interactive Lists. ---Setting the Cursor from within the Program. ---Changing

What do you mean by embedded system, It is a mixture of hardware and softwa...

It is a mixture of hardware and software to perform needed task

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