Explain the working of thousand line exchanges, Computer Engineering

Assignment Help:

Explain the working of thousand line exchanges by using a combination of uniselectors and two motion selectors.

The schematic diagram for such an exchange is demonstrated in Fig. All subscribers is connected to a single rotary pre-selector switch at the exchange, and the outputs from  this switch being linked to a bank of two-motion switches termed as 'group selectors'. The outputs from the pre-selector switches of an entire group of subscribers are connected together in parallel such as group of subscribers share a single bank of group selectors. If a subscriber lifts his telephone then the cradle switch causes a circuit to be completed reverse to the telephone exchange, signaling which the subscriber wants to make a call. It is causes the pre-selector switch to step around till it find a free group selector. The pre-selector switch then stops in such position and the group selector are 'seized' through the subscriber wishing to make a call.

1166_1000 Line Exchange.png

FIG - 1000 Line Exchange

In 1000 line exchange, all subscribers have a 3 digit identification number starting from 000 to 999. By seizing the group selector, the subscriber dials his first digit and the selector switch moves up to the suitable row on the switch contact array. All final selectors have the possibility of connection to 100 lines. Therefore the 1000 lines are divided in 10 groups of 100 each, the group being specified by the first digit in the subscriber's number. Therefore the vertical motion of the group selector selects a last selector in the group related with the first digit dialed. Each single row of contacts or levels, of the group selector is associated to a bank of last selectors associated with a particular group of 100 line numbers. Containing dialed the first digit to select the suitable group, the group selector arm after that automatically rotates in the vertical direction till it finds a free last selector. In the final selector, both directions of motion are in the control of the subscriber's dial and after dialing two additional digits, connection is established, giving the called subscriber's to answer his telephone.


Related Discussions:- Explain the working of thousand line exchanges

Give solution for readers-writers problem, Give a solution for readers-writ...

Give a solution for readers-writers problem using conditional critical regions. Solution for readers-writers problem using conditional critical regions: Conditional critical

Implement the concept of true and radix minus one complement, Q. Develop a...

Q. Develop a program to implement the concept of true and radix minus one complement. Program should ask for radix and two numbers from that radix. For that two numbers program

Operation codes used in assembly instructions, Q. Operation codes used in a...

Q. Operation codes used in assembly instructions? Now let's describe various operation codes needed for this machine so that we can translate High level language instructions t

Search mechanisms in prolog, Search mechanisms in Prolog: Here we can ...

Search mechanisms in Prolog: Here we can needs this simple Prolog program to describe how Prolog searches as:president(X) :- first_name(X, georgedubya), second_name(X, bush).

Explain about olap, OLAP is called as online analytical processing which gi...

OLAP is called as online analytical processing which gives answers to queries which are multi dimensional in nature. It composes relational reporting and data mining for giving sol

Assembler, Assembler: Typically a modern assembler makes object code b...

Assembler: Typically a modern assembler makes object code by translating assembly instruction into op codes, & by resolving symbolic names for memory locations and any other e

Why pointer variable to a function as an argument, Why pointer variable som...

Why pointer variable sometimes desirable to pass a pointer to a function as an argument? Frequently, a called function needs to make changes to objects declared in the calling

Define micro operation, Define Micro operation. The operations implemen...

Define Micro operation. The operations implemented on data stored in the registers are called Micro operation. A microperation is an elementary operation performed on the infor

Mobile cameras, Mobile cameras are characteristically low-resolution Digita...

Mobile cameras are characteristically low-resolution Digital cameras integrated in mobile set. Photographs are characteristically only good enough to show on low resolution mobile

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