1. SUMMER TRAINING REPORT HELD AT BSNL

2. INDEX 1. COMPANY PROFILE 2. INTRODUCTION 3. ABOUT THE EXCHANGE 4. MDF >TYPES OF FAULTS >PROTECTIVE DEVICES 5. OCB 6. GSM 7. MEDIA 8. PROCEDURE FOR HANDLING COMPLAINTS

3. INTRODUCTION Today, BSNL is the No. 1 telecommunication company and the largest public sector undertaking of India and its responsibilities includes improvement of the already impeccable quality of telecom services, expansion of telecom services in all villages and instilling confidence among its customers. EXCHANGE: Equipment which effects interconnected of telephones is known as switching equipment. The switching centre, which houses the terminating and switching equipment is called telephone exchange.

7. MAIN DISTRIBUTION FRAME (M.D.F) : INTRODUCTION: - MDF means Main Distribution Frame. Local cable contact at MDF . - All types of cables out to the door contact connection at MDF .

8. THE MAIN PARTS OF THE POWER ROOM ARE: 1. BATTERIES 2. UPS (UNINTERRUPTED POWER SUPPLY) 3. CHARGING - DISCHARGING UNIT 4. INVERTER AND CONVERTER UNIT: POWER PLANT :

11. VERTICAL SIDE RACK: - On the rack, the tags are situated. One rack is having eight tags. The counting is done from up (0) to down (7). TAGS: - Each rack consists of eight tags. 1 tag = 4 core 1 core = 4 bunch 1 bunch = 2 line N.E.:- The word NE stands for the ‘NUMBER OF EQUIPMENT’. It is used for testing number and WEDGE: Wedge is used as a device for checking the ring. Wedge is placed in jack strips, which is connected to telephone for checking.

13. CONSTRUCTION OF M.D.F:- Main distribution frame is mainly divided in two parts. (1) Vertical Side or Line side. (2) LEN side or Exchange side.

14. VERTICAL SIDE: All the part from vertical side to the subscriber are generally called outdoor section.: 1. One vertical has 10 tag blocks. 2. Each tag block has 10 rows and each row has 10 tags. So each tag block has 100 tags. 3. Connection between vertical side & subscribers are provided by jelly filled cables. 4. These wires are first terminated in cabinet box, then according to requirements the group of the wires (e.g. 200 wires, 100 wires etc.) is terminated in pillar box

15. LEN SIDE: • All the parts from LEN to the exchange is called indoor section. • The connection of subscriber from exchange is terminated on this side of MDF. • In 1 tag block there are 128 tags. Each tag block is divided in 4 segments. That is 0, 1,2 & 3 and in each segments.

16. . DIFFERENT TYPES OF FAULTS:- LOOP FAULT:- IF TWO WIRES ARE JOINED TOGETHER BECAUSE OF IMPROPER CONNECTION, STORMING AIR ETC. EARTH FAULT:- IF TWO WIRES GET SCRAPE AT SOME PLACES AND IF THIS WIRE COMES IN CONTACT WITH TREE, PILLAR OR ANY METAL OBJECTS THEN THIS TYPE OF FAULT OCCURS. CABLE FAULT:- FOR OUTDOOR CONNECTIONS, JELLY FILLED WIRES ARE USED WHICH ARE AFFECTED BY NATURAL CAUSES SUCH AS RAIN, EARTHQUAKE ETC. AT SUCH TIME THIS FAULT OCCURS. DISCONNECT FAULT:- THIS TYPE OF FAULT OCCURS DUE TO THE BREAKING OF WIRES BETWEEN THE VERTICAL SIDE & LEN SIDE.

22. GSM : (SYSTEM ARCHITECHTURE)

27. > PERMANENT RING > PERMANENT DIAL TONE > PERMANENT BUSY TONE > PERMANENT RING – TRIP > SPEECH QUALITY POOR > WRONG NUMBERS > ONE WAY SPEECH > RINGER CADENCE

28. THANK YOU