here i explore some imfomation for cell site (BTS) for the students who has intrested in Mobile communication.

1. SITE VISIT
VODAFONE
PREPARED BY :
BHARGAV SHANKHALPARA

2. SITE
DISCREPTION

3. BTS HAS A MAIN SECTIONS :
 POWER SECTION
 POWER PLANT
 BTS MACHINE
 TOWER & ANTENNA

4. POWER SECTION :
FIRST REQUIREMENT OF ANY BTS SITE IS POWER
SUPPLY …
POWER SUPPLY IS GET FROM THREE WAYS :
(1) GEB LINE
(2) GENERATOR
(3) BATTERYS

5. GENERATOR
WHICH PROVIDE POWER WHEN MAIN SUPPLY
(COMES FROM GEB) IS FAILS…

6. BTS HAS A MAIN SECTIONS :
 POWER SECTION
 POWER PLANT
 BTS MACHINE
 TOWER & ANTENNA

7. POWER PLANT :

POWER PLANT IS USED IN BTS TO
OBTAIN -48V DC FROM 440V AC SUPPLY.
 IN BTS -48V IS USED RESION BEHIND IT IS THAT
“Because 2 terminal comes out from the battery and through
red wire we ground the +ive terminal so that possibility of noise
interference will get zero....noise occur only in the +ive
terminal.....thats why we use -ive voltage. “

8. POWER PLANT :
•

9. BTS HAS A MAIN SECTIONS :
 POWER SECTION
 POWER PLANT
 BTS MACHINE
 TOWER & ANTENNA

10. BTS OF AIRTEL
(NOKIA)

11. RRI CARD
POWER CARD
BB2F CARD
BOIA CARD
DUPLEXER
Trx
COUPLER

12. BTS DIVIDE IN FOLLOWING UNITS:
(1) POWER CARDS
(2) BB2F
(3) Trx
(4) BOIA CARD
(5) ALARM EXTENSION SYSTEM
(6) RRI CARD
(7) COUPLER
(8) DUPLEXER

13. POWER CARDS :
 FIRST REGULATED -48 VOLT IS COMES FROM
POWER PLANT AND IT GIVE FIRST TO POWER
CARD ….
 IT DISTRIBUTE SUPPLY TO ALL EQUIPMENT OF
BTS.

14. BB2F CARD :

15. BB2F :
 FUNCTION OF BB2F IN NOKIA BTS IS DIGITAL SIGNAL
PROCESSING AND ALSO FREQUNCY HOPPING .
 ONE BB2F CAN OPERATE 2 Trx.
 THERE ARE TWO CONDITION OF BB2F
WHICH IS DETECTED BY LEDS….
(1) GREEN - OK
(2) RED- FAULTY

16. Trx :

17. Trx :
 Trx IS A EQUIPMENT WHICH HANDLE CALLS OF USER.
 ONE Trx CAN HANDLE 8 CALLS PER SECOND.
 WE CAN USE MAXIMUM 12 Trx ON ONE BTS.
 IT IS DEPEND ON BB2F CARD WHICH MAXIMUM VALUE IS 6.

18. BOIA CARD :
 BOIA CARD IS USED FOR SOFTWARE PROGRAMMING .
 BOIA CARD IS LIKE BRAIN OF BTS.
 THERE ARE SERIAL PORT IN IT FOR CONNECT IT TO LAPTOP.

19. ALARM EXTENSION SYSTEM :
 IT COLLECT WORKING STATUS OF VERIOUS UNITS BTS AD
EXTEND THEM TO OPERATION & MAINTENANCE (O & M)
MONITARING STATIONS.

20. RRI CARD :
 RRI CARD IS USED FOR
CONNECTION OF ODU (OUTDOOR
UNIT).
 THIS ANTENNA IS USED FOR
MICROWAVE LINK WHICH CONNECT
ONE BTS TO OTHER BTS…

21. (MULTI COUPLER) :
 WHEN WE USE MORE THAN TWO
TRx THEN IT IS REQUIRE TO
COUPLER AND THEN IT CONNECT
WITH DUPLEXER.
 ONE COMBINER IS USED TO HANDLE
TWO Trx.

22. DUPLEXER :  DUPLEXER IS A DEVICE WHICH IS
USED IN BTS TO USE SAME
ANTENNA FOR TRANSMISSION AS
WELL AS RECEIVER.
 SO ANTENNA HAS TWO CABLE ONE
FOR Tx & Rx WHICH CONNECT WITH
DUPLEXER.

23. DUPLEXER :

24. BTS HAS A MAIN SECTIONS :
 POWER SECTION
 POWER PLANT
 BTS MACHINE
 TOWER & ANTENNA

25. TOWER &
ANTENNA :
TOWER IS USED
TO GIVE HEIGHT
TO ANTENNA.
HEIGHT OF
TOWER IS 40m TO
75m.

26. ANTENNA :
 THERE TWO ANTENNA IS USED IN BTS.
 ONE FOR TRANSMISSION & RECEPTION OF
USER’S SIGNALS WHICH IS CALLED GSM ANTENNA.
 SECOND ANTENNA IS MICROWAVE ANTENNA WHICH IS
USED TO GET & FORWARD LINK FROM OTHER BTS.
 SECOND ANTENNA IS ALSO CALLED AS DRUM ANTENNA.

27. GSM ANTENNA :

28. MICROWAVE ANTENNA :

29. CALL PROCESS IN UPLINK :
1. Uplink Path GSM antenna.
2.Dual Variable Gain Duplex Filter unit.
3. Combiner (Multicoupler).
4. TRx(transceiver).
5. BB2F Card for DSP.
6. Transmission unit.
7. To BSC through Microwave Antenna

30.  CALL PROCESS IN DOWNLINK :
1. Downlink Path From BSC through Microwave
Antenna
2. Transmission unit
3. BB2F Card for DSP.
4. TRX (Transceiver).
5. Combiner (Multicoupler).
6. Duplexer.
7. GSM antenna, which passes the signal through
the Air interface to the MS

31.  SITE VISIT : TATA
• Problem : Rajkot MSC was not getting
connectivity from Junagadh.
• Solution :
Then by ping address of all the BTS in
Junagadh connectivity is checked, we found
the faulty BTS then it was found that GLI card
of that BTS was damaged which was replaced
afterwards.

32. THANK YOU