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

Explain the power chart, Explain the Power Chart The phasor diagram sho...

Explain the Power Chart The phasor diagram shown in Figure with the x and y axes added, as shown. This diagram may be converted to a 'power chart' by multiplying each phasor in

Representation of magnetic fields, The direction of the magnetic field line...

The direction of the magnetic field lines is given by 'Maxwell's Right-Hand corkscrew rule'  The thumb of the right hand indicates the direction of current flow in the wire and

The central processing unit - stepper motor , The Central Processing Unit ...

The Central Processing Unit The  central processing  unit  is the brain of whole PLC.  The CPU  consist of a microprocessor memory  chip  and other  integrated circuits to con

Describe about digital communication systems, Q. Describe about digital com...

Q. Describe about digital communication systems fl A digital signal can be deflned as having any one of a finite number of discrete amplitudes at any given time. The signal coul

Global positioning system, Global Positioning System: For power utilit...

Global Positioning System: For power utilities, the basic objective of using Global Positioning System (GPS) and GIS should be to: enhance the efficiency of transmissio

Merits and demerits of voltage divider bias, Merits and Demerits of Voltage...

Merits and Demerits of Voltage divider bias: Merits: 1. Not like the above circuits, only one dc supply is essential. 2. Operating point is approximately independent o

Describe about reduction clause, Q. Describe about Reduction Clause? Re...

Q. Describe about Reduction Clause? Reduction clause specifies an operator as well as one or more list items. For every list item a private copy is created on every thread and

Determine the circuit of three transistors dynamic ram cell, a. Determine t...

a. Determine the circuit of three transistors dynamic RAM cell and define briefly read and write functions. b. Write short note on factors influencing choice of layer for wiring

Pdc, disadvantages of shunt&series clippers

disadvantages of shunt&series clippers

Determine the load voltage and the armature current, Q. Two shunt generator...

Q. Two shunt generators operate in parallel to supply a total load current of 3000 A. Each machine has an armature resistance of 0.05and a field resistance of 100. If the generat

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