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

Factors involved in the voltage build up of shunt generator, Q.   List and ...

Q.   List and explain the factors involved in the voltage build up of shunt generator. Ans. following factors are involved in voltage build up of shunt generation

., Ask quA 380-V, 15-hp, 50-Hz, four-pole, Y-connected wound-rotor inductio...

Ask quA 380-V, 15-hp, 50-Hz, four-pole, Y-connected wound-rotor induction motor has the following impedances in ohms per phase referred to the stator circuit: R1= 0.453? R2= 0.24

Voltage breakdown Diode, Help me, i need some answer regarding Voltage brea...

Help me, i need some answer regarding Voltage breakdown. What formula do I use?

What is centralized spc, Q. What is centralized SPC? In centralized con...

Q. What is centralized SPC? In centralized control, all control equipment is replaced by a single processor which should be quite powerful. It should be capable of processing 1

Explain medium length lines, Explain Medium length lines? Medium length...

Explain Medium length lines? Medium length lines cover lines in the range of 50 to 150 miles (80 to 240 km). Due to the increased length of the line, the shunt capacitance of t

Digital logic circuits, . In successive-approximation A/D converter, offset...

. In successive-approximation A/D converter, offset voltage equal to 1/2LSB is added to theD/A converter’s output. This is done to

Energy conservation, Energy Conservation Our country has a vast poten...

Energy Conservation Our country has a vast potential of energy saving. It is estimated in which measures for energy conservation and improving energy efficiency have the pote

Bjt, what is compensation of bjt

what is compensation of bjt

Switched mode power supply , Switched Mode Power Supply  (SMPS) Switch...

Switched Mode Power Supply  (SMPS) Switching mode power  supply converts an unregulated DC voltage  to a regulated DC  output  voltage . SMPS  stands  for switched mode  power

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