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

Register addressing mode - computer architecture , Register Addressing mode...

Register Addressing mode - computer architecture: Register Addressing: Register addressing mode is same to direct addressing. Only difference in between is that the addre

Write a program that will solve a puzzle, You will write a program that wil...

You will write a program that will solve a version of the common newspaper puzzle \word search." In the puzzle you are given a grid lled with characters and a list of words to nd

The javascript validation not run on the asp.net, Why The JavaScript Valida...

Why The JavaScript Validation Not Run on the Asp.Net? The Asp.Net Button Is post backed on the server & not yet Submit & when it goes to the server its states is lost so if we

Basic operational concepts of a computer, Basic Operational Concepts of a C...

Basic Operational Concepts of a Computer: Most of computer operations are executed in the ALU (arithmetic and logic unit) of a processor. For an example: to add 2 numb

Define hit ratio, Define Hit ratio. The performance of cache memory is ...

Define Hit ratio. The performance of cache memory is frequently measured in terms of quantity called hit ratio. Hit-Find a word in cache. Miss-Word is not found in cache.

While using ftp what is wildcard expansion in file names, While using FTP w...

While using FTP what is wildcard expansion in file names? To make this easy for users to identify a set of file names, FTP permits a remote computer system to perform usual fil

Features of hyper-threading, The salient features of hyper threading are: ...

The salient features of hyper threading are: i)  Improved support for multi-threaded code, permitting multiple threads to run concurrently. ii) Response time and improved rea

Describe clusters in cellular systems, Question: a) With the help of a...

Question: a) With the help of a diagram, describe clusters in cellular systems. b) Describe the role of the following components in the GSM architecture Radio Sub-Sy

How does the internet work, Every computer connected to Internet has a uniq...

Every computer connected to Internet has a unique address. Let's just say your IP address is 1.2.3.4 and you want to send a message to computer with IP address 5.6.7.8. Message you

Two ethernet switches sw1 and sw2 , Six machines H1, H2, ..., H6 are linked...

Six machines H1, H2, ..., H6 are linked by two Ethernet switches SW1 and SW2 as given below. Both switches have four ports drawn. The port numbers are as indicated. Suppose the two

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