Describe CCIT hierarchical structure, Electrical Engineering

Assignment Help:

Q. Describe CCITT  hierarchical  structure  of  switching  and  routing  using  block schematic. 

Ans:

Hierarchical network are capable of handling heavy traffic where required and at the same instance use minimal number of trunk groups. A 5-level switching hierarchy is recommended by CCITT as displayed in Figure. In a strictly hierarchical network, traffic from subscriber A to subscriber B and vice-versa flows through highest level of hierarchy, as follows. Quaternary centres in Figure. A traffic route via the highest level of hierarchy is called the final route. Though if there is a high traffic intensity between any pair of exchanges, direct trunk groups may be established between them as displayed by dashed lines in Figure. These direct routes are termed as high usage routes. Wherever high usage routes exist, traffic is primarily routed through them. Overflow traffic, if any, is routed along hierarchical path. No overflow is permitted from the final route. In Figurethe first choice routing for traffic between subscribers  A  and  B  is  via  high  usage  route  across  the  primary  centres.  Second and third choice route and final route are also indicated in Figure. A hierarchical system of routing results in simplified switch design. Three methods are generally used for deciding on the route for a particular connection:

 1.  Right-through routing.

2.  Own-exchange routing.

3.  Computer-controlled routing.

1246_Describe CCITT hierarchical structure.png


Related Discussions:- Describe CCIT hierarchical structure

Cmp compare instruction , CMP Compare Instruction This instruction is ...

CMP Compare Instruction This instruction is used to compare the contents  of register  or memory  with accumulator the contents of the operand remain  unaffected. There are tw

Obtain voltage sing the laplace transform method, Obtain v(t) in the circui...

Obtain v(t) in the circuit of Figure by using the Laplace transform method.

Microprocessor, distingish between maximum and minimum modes of operations ...

distingish between maximum and minimum modes of operations of 8086 with timing diagrames

Determine the current and voltage for n-channel jfet, Q. An n-channel JFET ...

Q. An n-channel JFET with A = 300 V, P = 2 V, and I DSS = 10 mA is to be operated in the active mode. Determine i D when v DS = 10 V and v GS =-0.5V.

Discuss important properties and uses of ceramics, Discuss important proper...

Discuss important properties and uses of Ceramics. Ceramics - These are materials made by high temperature firing treatment of natural clay and specific inorganic matters. The

What is positive clipper, Q. What is positive clipper? Give 2 types of its ...

Q. What is positive clipper? Give 2 types of its applications ? In the series positive clipper, when the input voltage is positive, the diode does not conduct and acts an open

Variations of drain current - drain voltage, Q. Consider the common-source ...

Q. Consider the common-source JFET circuit shown in Figure with ?xed bias. Sketch the sinusoidal variations of drain current, drain voltage, and gate voltage superimposed on the di

Explain the different instruction formats, Explain the different instructio...

Explain the different instruction formats with examples The instruction set is grouped into the following formats One byte instruction MOV C,A Two byte instruction

Explain the term- electronic mail, Explain the term- Electronic Mail (email...

Explain the term- Electronic Mail (email) Another form of communication is through email. This has the below advantages over video conferencing: -  There are no language pro

State the functions of a fuse, State the functions of a fuse. Fuse is ...

State the functions of a fuse. Fuse is a protective device that made of a thin wire or strip. This strip or wire is placed with the circuit this has to protect, therefore the

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