Determine briefly subscriber loop system, Electrical Engineering

Assignment Help:

Q. Determine briefly subscriber loop system.  Give some technical specification for subscriber lines.

Ans:

Subscriber Loop System:Each subscriber in a telephone network is connected generally to the nearest switching office by a dedicated pair of wires. Subscriber loop refers to this pair of wires. It is un-widely to run physically independent pairs from each subscriber premises tothe exchange. It is far easier to lay cables comprising a number of pairs of wires for different geographical locations and run individual pairs as needed by subscriber premises.

1299_Determine briefly subscriber loop system.png

Commonly four levels of cabling are used as displayed in figure. At the subscriber end, drop wires are taken to a distribution point. Drop wires are the individual pairs which run into the subscriber premises. At distribution point, drop wires are connected to wire pairs in distribution cables. Many distribution cables from nearby geographical locations are terminated on a feeder point where they are linked to branch feeder cables which, in turn, are linked to main feeder cable. Main feeder cables carry a larger number of wire pairs, usually 100-2000, than distribution cables which carry normally10-500 pairs. Feeder cables are terminated on a main distribution frame (MDF) at the exchange. Subscriber cable pairs emanating from exchange are also terminated on the MDF.

Exchange  pairs  and  subscriber pairs are interconnected at the MDF by jumpers. MDF thus provides a flexible interconnection mechanism which is very useful in reallocating cable pairs and subscriber numbers. Technical specifications for subscriber lines include:

1.  Diameter of wire

2.  D.C. resistance per Km

3.  Attenuation per K


Related Discussions:- Determine briefly subscriber loop system

Economic analysis of hydropower, find the net value of power if an average ...

find the net value of power if an average value of energy is assumed to be $0.05/KWh, the capacity value is $30/kw-yr ...

Concept of flux density, We can illustrate the direction and strength of a ...

We can illustrate the direction and strength of a magnetic field by means of drawing 'flux lines'. These have arrows to show the direction of the magnetic field at any point and th

Determine the current gain, A JFET for which V A = 80 V, V P = 4 V, and I...

A JFET for which V A = 80 V, V P = 4 V, and I DSS = 10 mA has a quiescent drain current of 3 mA when used as a common-source amplifier for which R D = R SS = 1k and R L = 3k

Binary multiplication, Binary Multiplication Multiplication can be seen a...

Binary Multiplication Multiplication can be seen as multiple additions. For  example  if we  have to multiple 4 and 8 we can  8, 4  time to get the  solution. Actually this  conc

What are the different types of distributing frames, Q. What are the differ...

Q. What are the different types of distributing frames used in exchanges? Ans: Different distribution  frames  used  in  exchange  are  displayed in  figure.  Each subscribe

Determine transformer turns ratio, A flyback converter is to be designed so...

A flyback converter is to be designed so that it operates in continuous "current" (flux) mode with a duty cycle of D = 0.45 when input voltage V s = 48 V, output voltage V o = 30

Fibre optics, 1. A very narrow laser beam in air is shone into a sphere of ...

1. A very narrow laser beam in air is shone into a sphere of solid glass that has a uniform refractive index n>1 and radius ? . The beam makes an angle a in air with the normal to

Write a short note dispersion shifted dispersion flat fiber, Write a short ...

Write a short note on dispersion shifted and dispersion flatted fibers? The dispersion features of a fiber is display below: The overall dispersion is the sum of materi

Managing a Professional Engineering Project, Design a solar powered electri...

Design a solar powered electric vehicle charging station in a liquid gas station

Write notes on clamping, Q. Write notes on clamping ? When a signal dr...

Q. Write notes on clamping ? When a signal drives an open-ended capacitor the average voltage level on the output terminal of the capacitor is determined by the initial charge

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