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

Telephony, connection of STS MUX/DMUX

connection of STS MUX/DMUX

Oscillator, how to design colpitts oscillator?

how to design colpitts oscillator?

Cpopy 16 bit data register pair , cpopy 16 bit data  Register pair E...

cpopy 16 bit data  Register pair Example  : Copy  16 bit  data 3 E 21H  in register pair BC Solution   :The  statement  is LXI B 3E 21H 16  bit data  3E 21H in reg

Determine the voltage across the capacitor, (a) Let a unit impulse of curre...

(a) Let a unit impulse of current i(t) = δ(t) be applied to a parallel combination of R = 3 and C = 1/2 F. Determine the voltage vC(t) across the capacitor. (b) Repeat (a) for

What is balanced budget, Q. What is Balanced Budget? Balanced Budget: A...

Q. What is Balanced Budget? Balanced Budget: An annual budget (like for a government) in that revenues perfectly offset expenditures, so that there is neither a deficit nor a s

Calculate the actual frequency of circuit, (a) The circuit of Figure 1 repr...

(a) The circuit of Figure 1 represents an amplifier-speaker connection. The filter is a low pass filter which is connected to the woofer. The filter is a -network. (i) Design a

Find the overall current drawn from the supply, Q. A single-phase industria...

Q. A single-phase industrial plant consists of two loads in parallel: P1 = 48kW PF1 = 0.60 lagging P2 = 24kW PF2 = 0.96 leading It is operated from a 500-V, 60-Hz source.

Explain shunt-field control process, Q. Explain Shunt-field control process...

Q. Explain Shunt-field control process? Shunt-field control, armature-resistance control offers a constant-torque drive because both flux and, to a first approximation, allowab

Illustrate flat plate collectors, What is the use of basic earth-sun angles...

What is the use of basic earth-sun angles? Show by mean of diagram. Illustrate sun as source of energy with relevant data? Illustrate flat plate collectors. Describe liquid f

Framework for indicators in electricity sector, Framework for Indicators in...

Framework for Indicators in Electricity Sector A framework has been developed and a set of core indicators for electricity Sector has been proposed. In the first example, mapp

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