1. INDUSTRIAL TRAINING BHOPAL (MADHYA PRADESH)
UNDER THE GUIDANCE OF: SUBMITTED BY:
ER. H.K. PATIL MR. AMLAN BASU
SENIOR MANAGER, ITM UNIVERSITY,GWALIOR(M.P.)
COMMIUNICATION DIVISION, ROLL NO. : BETI1EC11009
BHEL, BHOPAL(M.P.) BRANCH: ECE (INTEGRATED)
TOKEN NO. : VT-460/14

2. ABSTRACT 4 weeks training From 29th May,2014 to 25th June 2016
Communication Division
Motive: Telephone exchange, Fault checking, Functions of department

3. ABOUT BHEL
Founded in 1964
7th largest power equipment manufacturer in the world
Owned and founded by the Government of India
Is a Public sector of India undertaking
B. Prasad Rao (Chairman & MD)
Revenue:  ₹ 50,156 Crores (USD 9.23 billion) ( )
Employees: 48,399 (March 2013)
Products Manufactured: Gas and Steam Turbines, Boilers, Generators, Heat Exchangers, Pumps, Switchgears, Sensors, Automation and Control Systems, Power electronics, Transmission systems, Transformers.

4. TELEPHONE EXCHANGE Telecommunications system
Used in public switched telephone networks
Consists of different electronic equipments
Main part is exchange (older system: PBX[private branch exchange, modern system: EPABX [electronic private automatic branch exchange])
Has 3 parts.

5. TELEPHONE EXCHNGE EPABX (ELECTRONIC PRIVATE AUTOMATIC BRANCH EXCHANGE)
(MAIN DISTRIBUTION FRAME)
MDF
POWER SUPPLY
(48 V DC)

6. M.D.F (Main Distribution Frame)
Signal distribution frame (connecting equipments to cables and subscriber carrier equipment)
Flexibility in assigning facilities (at lower cost & higher capacity)

7. TO DIFFERENT SUBCRIBERS
EPABX
EXCHANGE MDF
FIELD MDF
TO DIFFERENT SUBCRIBERS

8. EPABX (Electronic private automatic branch exchange)
Connect to the external or internal communication lines.
Also called auto numbers or land line numbers.
3000 numbers
IRIS IVDX coral (provided by coral telecomm. that has 4000 ports)

9. CORAL IRIS IVDX
4000 Ports divided into 8 frames and each frame with 512 ports.
Each port has a card
Cards: MCC, PRI, FLC, DCC, FTC, PBC, RPBC .

10. MCC (MAIN CONTROLLER CARD)
The first card of the frame
Has a switching part and another DSP part (ring back tone)
MCC 8 / MCC 16 / MCC 32
Dialling type: DTMF & FSK

11. PRI (Primary rate interface)
Interface between the different channels or DSP or Ring back tonnes.
30 channels per PRI (ex. 9 PRIs: 270 channels)
Pair of 2 (incoming and outgoing)
DID (direct incoming dialling) & DOD (direct outgoing dialling) : Incoming junction (via operator)

13. FLC (feature line card) 16/32: The card controls all the analog numbers. Connects the exchange to exchange MDF.
DCC (digital control card): The card controls all the digital numbers.
FTC (feature trunk card) & FCT (feature cellular trunk): Responsible for the calls made to the cellular devices/mobile which are connected to the high gain antennas.
The other cards PBC (peripheral bridge cards) & RPBC (Rack peripheral bridge cards)

14. TELEPHONE
Telecommunication device that enables 2 or more users to communicate
Invented by Alexander Graham Bell in 1876
Earlier had rotary dial but now has DTMF push button
2 types: Analog telephone & Digital telephone

15. Frequency it works on is 30Hz – 3
Frequency it works on is 30Hz – 3.5 KHz and voltage rating of 40V – 48V
2g : 900MHz MHz
3g : 1800 MHz – 2100MHz

16. FAULTS Noise or disturbance Temporary out of order Interference
Line busy
False calling
Ring Problem

17. FAULT DETECTION Various ways of fault detection
The most important is cable fault detection using MEGGER

18. TRANSMISSION MEDIA
Optical fibre (of 6 pair used earlier, now combination of 20 is used)
Earlier: Insulation coating of paper
Now: Insulation coating of PVC

19. PAIR COMBINATION OF TRANSMISSION CABLE
1-5
Blue-white
Orange-white
Green-white
Brown-white
Slate- white
10-15
Blue-black
Orange-black
Green-black
Brown-black
Slate - black
5-10
Blue-red
Orange-red
Green-red
Brown-red
Slate-red
15-20
Blue-blue
Orange-blue
Green-blue
Brown-blue
Slate-blue

20. POSTAL SECTION (DAAK) Receiving and sending
Both official and residential
Update records in file and online
Special rechargeable machine for postal stamps

21. UPDATION AND BILLING SECTION
Call records
Updating the opening and closing of numbers
Co-ordination with finance department
Co-ordination with BSNL for the record of calls going out of BHEL premises
Updating (file) of MDF chrome section manually on daily basis
Updating numbers in use and not in use.

22. CONCLUSION
The communication was made possible by the equipments and the details of the same were also done.
Learnt about the proper functioning of communication division of BHEL, Bhopal (M.P.)