What are the supplementary services, Electrical Engineering

Assignment Help:

Q. What are the supplementary services?

new services are called supplementary services and some of the prominent ones are as below:

Category 1:

  • Abbreviateddialling
  • Recorded number calls or no dialling calls
  • Call back when free.

Category 2:

  • Call forwarding
  • Operator answer.

Category 3:

  • Calling number record
  • Call waiting
  • Consultation hold
  • Conference calls.

Category 4:

  • Automatic alarm
  • STD barring
  • Malicious call tracing

A subscriber issues commands to an exchange to deactivate or activate a service, record or clear data in subscriber line data area or solicit an acknowledgement from exchange. As an instance, a user can disable or enable STD facility on his line by using a command. A command may have or may not have data associated with it. Number of digits in the data, when present, can vary depending upon the command. Consequently, subscriber commands are designed to be of variable length necessitating use of an end-of-command symbol.


Related Discussions:- What are the supplementary services

CMA instruction of 8051., if contents of accumulator are all one''s then re...

if contents of accumulator are all one''s then result would be zero so Z flag should be affected and same if all zero''s.....but here it is written that no flags is affected...

Purpose of control word written to control register in 8255, What is the pu...

What is the purpose of control word written to control register in 8255? The control words written to control register state an I/O function for every I.O port. The bit D7 of t

Audio Amplifier, Hi, i''ve been given this task: You are required to desig...

Hi, i''ve been given this task: You are required to design a multi-stage audio amplifier with the following specification: Voltage gain 250 Input resistance 200 kOhm Output resi

Define two popular parallel protocol used in embedded system, a. Compare th...

a. Compare the serial protocols, parallel protocols and wireless protocols in terms of formats, speed, performance and security issues. b. Briefly define two popular parallel pr

Define some huntington postulates - boolean algebra, Define some Huntington...

Define some Huntington postulates - Boolean Algebra? Postulates 1. Commutative Law (a) A + B = B + A (b) A B = B A 2. Distributive Law (a) A (B + C) = A B + A

Explain and draw hysteresis loop for soft magnetic material, Draw the hyste...

Draw the hysteresis loop for a soft magnetic material and compare it with the hysteresis loop of hard magnetic material. Give two examples of each. Soft and hard magnetic mate

Explain temperature dependency in conductors, Explain temperature dependenc...

Explain temperature dependence of electrical conductivity and resistivity in conductors. When the temperature is increased, there is a greater thermal motion in atoms that redu

Define lines parameters, Define Lines Parameters In power system analys...

Define Lines Parameters In power system analysis, the parameters of interest when modelling power lines are:  inductance, capacitance, series resistance and leakage resistance.

Construction and working of analog type storage oscilloscope, Q.   Describe...

Q.   Describe in detail the construction and working of analog type storage oscilloscope. Explain the principle of secondary emission. Analog Storage Oscilloscopes: Storage o

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