Explain standard set of procedure to complete a call process, Computer Engineering

Assignment Help:

Explain a standard set of procedure for completing a local telephone call or call processing.

Completing a local telephone call among two subscribers connected to the similar telephone switch is accomplished by a standard set of procedure which includes the 10 steps listed next.

1. Calling station goes off hook.

2. After detecting a dc current flow at the loop, the switching machine returns an audible dial tone to the calling station, acknowledging as the caller has access to the switching machine.

3. The caller dials the destination telephone number by using one of the two ways: Mechanical dial pulsing or, more probably, electronic double-tone multi frequency (Touch-Tone) signals.

4. Whenever the switching machine senses the first dialled number, this removes the dial tone from the loop.

5. The switch interprets the telephone number and after that locates the loop for the destination telephone number.

6. Before ringing the destination telephone, the switching machine tests the destination loop for dc current to notice if this is idle (on hook) or in utilize (off hook). Simultaneously, the switching machine locates a signal path by the switch among the two local loops.

7. (a) When the destination telephone is off hook then the switching machine sends a station busy signal back to the calling station.

(b) When the destination telephone is on hook so the switching machine sends a ringing signal to the destination telephone on the local loop and similar time sends a ring back signal to the calling station to provide the caller any assurance that something is occurrence.

8. If the destination answers the telephone, this completes the loop, causing dc current to flow.

 9. The switch knows the dc current as the station answering the telephone. Now, the switch removes the ringing and ring-back signals and finishes the path by the switch, permitting the calling and called parties to start conversation.

10. If either end goes on hook, the switching machine senses an open circuit on which loop and after that drops the connections by the switch.


Related Discussions:- Explain standard set of procedure to complete a call process

Explain SR latch using nor gates, Q. Explain SR Latch using NOR gates? ...

Q. Explain SR Latch using NOR gates? Let's inspect the latch more closely.   i. Suppose initially 1 is applied to S leaving R to 0 at this instance. The instant S=1 output o

Define modem, Define Modem. A modem changes digital signals into audio ...

Define Modem. A modem changes digital signals into audio tones to be transmitted over telephone lines and also changes audio tones from the lines in digitals signals for machin

Distinguish between how ntfs and fat store time, Problem (a) Distingu...

Problem (a) Distinguish between how NTFS and FAT store time. Describe your answer. (b) Unix epoch starts as from January 1, 1970, 00:00:00 GMT. Provide that Unix stores

Define constraints, Define Constraints Constraints can be defined as P...

Define Constraints Constraints can be defined as Preconditions (input values) and Post Conditions (output values). Preconditions on functions are constraints which input value

Major characteristics of a computer family, Q. Major characteristics of a c...

Q. Major characteristics of a computer family? Let us summarise the major characteristics of a computer family. These are as below: Figure: Characteristics of computer

Structured analysis and design approach, Q. Structured Analysis and Design ...

Q. Structured Analysis and Design Approach? The objective of structured system analysis and design is to reduce maintenance time as well as effort. Modeling is the act of drawi

Transfer data among computers on the internet, Tool that is used to transfe...

Tool that is used to transfer data/files among computers on the Internet TCP (Transfer control protocol)

State about the three-dimensional digitizers, State about the Three-dimensi...

State about the Three-dimensional digitizers Three-dimensional digitizers use sonic or electromagnetic transmissions to record positions. One electromagnet transmission method

Host computer-array processing, Host Computer:  An array processor may be a...

Host Computer:  An array processor may be attached to a host computer by the control unit. The reason of the host computer is to broadcast a sequence of vector instructions by CU t

How many types of memory in computer architecture, Computer have many type ...

Computer have many type of memory like primary memory , Auxiliary memory ,  Cache memory , buffer memory ,virtual memory , The work of all memory heterogeneously primary memory

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