SRI SAI ADITYA INST OF SCI & TECH

MINI PROJECT SEMINAR Presented by B.SANKAR NAVEEN

1. BRIEF VIEW OF VSP

2. INTRODUCTION TO COMMUNICATION

3. PCM & TDM

4. EXCHANGE

5. AC & DC POWER SUPPLY

6. SWITCHING EQUIPMENT

7. MAC CONSOLES

8. MAIN DISTRIBUTION FRAME

9. FEATURES PROVIDED BY EXCHANGE

10.CONCLUSION

TDM-PCM BASED 3000 LINES ELECTRONIC EXCHANGE

VIZAG STEEL PLANT IN BRIEF

• VSP has become a ISO-9002 certified company produces 3 million tons liquid steel & 2.66 million tons of salable steel per annum.

• Entire steel plant is divided into various zones they are

Coke ovens: Takes raw coal as input and produces coke. Blast Furnace: Output is liquid iron.

Steel Melt Shop: Oxygen lancing is takes place. Rolling Mills: Final shape to the products.

• For every block communication is takes place through exchanges.

• Exchanges for plant and sectors.

COMMUNICATION

Communication is the transfer of meaningful information from transmitter to receiver.

BLOCK DIAGRAM OF A COMMUNICATION SYSTEM

The term communication system refers to the sending, receiving and processing of Information by electronic means.

• A Modem communication system is concerned with sorting, processing and storing of information before its transmission.

• The invention of telephone in 1876 has marked revolution in world’s telecommunica- tion system.

• Modem switching system is effected automatically as on the Strowger, Crossbar and electronic system of interconnection.

• Electromechanical switching system will afford a high degree of versatility through the program stored in the memory.

• Digital rather than analog. Speech signals will be multiplexed by pulse methods with channels interleaved in time instead of frequency.

• Satellite communication, Global internet, and other value added services are providing by this telecommunication.

PRINCIPLES OF TDM & PCM

• Time division multiplexing is a technique used for transmitting several analog message signals over a single channel.

• Pulse code modulation is a method to digitally represent sampled analog signals

EXCHANGE

In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls.

Manual switching system is operator controlled and Connection will be takes place by the order of the caller subscriber.

Automatic exchanges automatically senses an off hook (tip) telephone condition, provides dial tone to that phone.

THE 3000 LINES TOWNSHIP TELEPHONE EXCHANGE

• HIPATH 4000 Exchange is IP enabled fully ISDN exchange with hot swappable, and of stored program controlled using PCM & TDM.

• The design of the exchange is based on Universal Port architecture to enable Interchanging of peripheral cards like line cards and trunk cards in slots.

• ISDN: Integrated Services Digital Network (ISDN) is a set of communications standards for simultaneous digital transmission of voice, video, data.

• Feature of ISDN is that it integrates speech and data on the same lines, adding features that were not available in the classic telephone system.

• There are two kinds of access interfaces to ISDN defined as Basic Rate Interface (BRI), Primary Rate Interface (PRI).

• The entry level interface to ISDN is the Basic(s) Rate Interface (BRI), a 128 kbit/s service delivered over a pair of standard telephone copper wires.

• The other ISDN access available is the Primary Rate Interface (PRI), which is carried over an E1 (2048 kbit/s) in most parts of the world.

Technical specifications of exchange are: • Exchange type & capacity:

• Input supply:

• Network switching:

• Loop resistance:

• IVRS:

• Alarm indications:

TELECOM NETWORK IN TOWNSHIP

TOWNSHIP EXCHANGE

PLANT EXCHANGE

BSNL EXCHANGE

120 PRI + 60 LD TIE

Connected to plant exchange through 120 of PRI and 60 LD trunk lines.

BLOCK DIAGRAM OF 3000 L HIPATH-4000 EXCHANGE AND ITS EQUIPMENTS

440 V OLTS 3 PHASE INCOMING POWER

SUPPLY

CUBICLE

DC SWITCHING

CUBICLE

SWITCH MODE RECTIFIER-UNIT-1

SWITCH MODE RECTIFIER-UNIT-2

VRLA -BATTERY BANK -I

VRLA -BATTERY BANK -2

SWITCH

MAIN DISTRIBUTION FRAME

ADMIN &MAINTENANCE-

CONSOLE

1.AC INCOMER CIRCUIT

• 440V ac 3ph supply from MRS and TPP direct.

2. DC Power supply Equipment

• Converts to 48v dc power. •2 no of switch mode rectifier units

•1 no of 600 amps Manual DC switching Cubicle unit

•1 no of Manual Switching cubicle

•2 no of VRLA Battery Banks

3.SWITCHING EQUIPMENT

• Switching equipment is housed in 4 cabinets that are divided into CONTROL UNIT& PERIPHERAL UNIT

• CALL PROCESSING: Total call processing is divided into two parts a) signaling b) speech transfer(slc)• Different types of cards using: SLMA 24, RGE, SIUX, DPC-5, HDD/MOD

HDD/MOD

4.MAC CONSOLES

For MAN MACHINE INTERFACE: Interaction is of command prompt type and not a graphical user interface(GUI) based.

For CALL BILLING: All the out going calls or organizations can be recorded into a PC with the help of this system. provides call billing extension

For IVRS: By dialing different codes different functions will be takes place.

SLMAC: it interfaces between the system and analog devices converts analog – digital and digital - analog

5.MAIN DISTRIBUTION FRAME EQUIPMENT

• All the subscriber lines and junction lines from exchange are terminated on one side and field cables on other side.

• it provides protection to exchange by employing PTC and GD tubes.

• The Exchange side of MDF consists of six columns of 100 pair module blocks and The line side consists of 12 columns of 100 pair module blocks each.

• AUTOMATIC LINE TESTING EQUIPMENT: MDF is provided with ALTE. It is a PC based system through which the testing of the subscriber is done.

• In township exchange KRONE-MDF is being used which is provided with IPM s so as to protect exchange equipment from high currents and voltages.

FEATURES PROVIDED BY THE EXCHANGE

Three party conferences;

Auto call back on Busy/No answer:

Wake up service Facility:

Call pick up:

Do not Disturb:

Call Forward:

Call Transfer:

and Interactive voice response system:

CONCLUSION

Communication creates new era in the technology while in this communication exchange brings a great change in communication.

Role play of exchange in communication system is the major one and the vast Development of electronics keeps applications provided by exchanges will Increases.