SITE VISIT VODAFONE PREPARED BY : BHARGAV SHANKHALP SHANK HALPARA ARA
SITE DISCREPTION
SITE DISCREPTION
BTS HAS A MAIN SECTIONS : POWER SECTION
POWER PLANT
BTS MACHINE
TOWER TO WER & ANTENNA
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
GENERATOR WHICH PROVIDE POWER WHEN MAIN SUPPLY (COMES FROM GEB) IS FAILS…
BTS HAS A MAIN SECTIONS : POWER SECTION
POWER PLANT
BTS MACHINE TOWER & ANTENNA
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. “
POWER PLANT :
•
BTS HAS A MAIN SECTIONS : POWER SECTION
POWER PLANT
BTS MACHINE TOWER & ANTENNA
BTS OF AIRTEL (NOKIA)
RRI CARD POWER CARD BB2F CARD
BOIA CARD
DUPLEXER
Trx
COUPLER
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
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.
BB2F CARD :
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
Trx :
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.
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.
ALARM EXTENSION SYSTEM : IT COLLECT WORKING STATUS OF VERIOUS UNITS BTS AD EXTEND THEM TO OPERATION & MAINTENANCE (O & M) MONITARING STATIONS.
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…
(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.
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.
DUPLEXER :
BTS HAS A MAIN SECTIONS : POWER SECTION
POWER PLANT
BTS MACHINE TOWER & ANTENNA
TOWER & ANTENNA : TOWER
IS USED TO GIVE HEIGHT TO ANTENNA. HEIGHT
OF TOWER IS 40m TO 75m.
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.
GSM ANTENNA :
MICROWAVE ANTENNA :
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
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
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.
