8/10/2019 Why -48V to BTS

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Why -48 v is given to bts?

-48v is given to bts because in this voltage Noise generation is minimum.

-We can use +48 but the lightning has -ve charge due to attraction the entire

network may destroy so we use the -48 which repel the lightning that make the

network safer from great destruction...

-When interference is occur in voltages it affect only positive pulse not in negative

terminal so if we make positive common then no interference occur And we get pure

-48 volts without any interference.

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.

The first region all the electrical surges and noises are +ve in nature, when we give

-ve polarity then negative supply neutralises these noises & surges thus reducing

false triggering effect.

The second region, By using negative polarity the cable doesnt rusted or oxidized

thus remains for longer life, but cable dia get reduced in 15 to 18 month, so cable

will be change.

-To prevent the equipments from lightning strokes. Because the cloud is negatively

charged at bottom it requires a zero or a positive potential to discharge, and it

selects the ground (Zero potential) to discharge. If the Telecom Equipments are fed

with positive the cloud will choose the low resistance tallest positively charged

Antenna's to discharge, this could damage the entire setup of Telecom equipments.

So the Telecom equipments are fed with Negative supply Voltage.

Where a list:

RXOCFFC1A0 Reset, failed restart attempt

RXOCFFC1A1 Reset, power on

RXOCFFC1A10 Indoor temperature out of safe range

RXOCFFC1A12 DC voltage out of rangeRXOCFFC1A14 Local bus fault

RXOCFFC1A15 RBS database corrupted

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RXOCFFC1A16 RU database corrupted

RXOCFFC1A17 HW and IDB inconsistent

RXOCFFC1A18 Internal configuration failed

RXOCFFC1A19 Indoor temperatur above safe range

RXOCFFC1A2 Reset, switch

RXOCFFC1A20 Indoor temperatur below safe range

RXOCFFC1A3 Reset, SW fault

RXOCFFC1A4 Reset, watchdog

RXOCFFC1A5 Reset, RAM faultRXOCFFC1A6 Reset, internal function change

RXOCFFC1A7 X bus fault

RXOCFFC1A8 Timing unit VCO fault

RXOCFFC1A9 Timing bus fault

RXOCFFC1B4 L/R SWI (BTS in local mode)

RXOCFFC1B5 L/R TI (Local to remote while link lost)

RXOCFFC2A0 Reset, failed restart attempt

RXOCFFC2A1 Reset, power on

RXOCFFC2A10 DXU optional EEPROM checksum fault

RXOCFFC2A11 ALNA fault

RXOCFFC2A12 RX maxgain/mingain violated

RXOCFFC2A13 Timing unit VCO ageing

RXOCFFC2A14 CDU supervision/comunication lost

RXOCFFC2A15 VSWR/Output power supervision lost

RXOCFFC2A16 Indoor temperature out of normal conditional range

RXOCFFC2A17 Indoor humidity

RXOCFFC2A18 DC voltage out of range

RXOCFFC2A19 Power system in stand-alone mode

RXOCFFC2A2 Reset, switch

RXOCFFC2A20 External power fault

RXOCFFC2A21 Internal power capacity reduced

RXOCFFC2A22 Battery backup capacity reduced

RXOCFFC2A23 Climate capacity reduced

RXOCFFC2A24 Coolor capacity reduced

RXOCFFC2A25 Heater capacity reduced

RXOCFFC2A26 Climate sensor fault

RXOCFFC2A27 System voltage sensor fault

RXOCFFC2A28 A/D converter fault

RXOCFFC2A29 Varistor fault

RXOCFFC2A3 Reset, watchdog

RXOCFFC2A30 Local bus fault

RXOCFFC2A31 High-frequency software fault

RXOCFFC2A32 Non-volatile memory corruptedRXOCFFC2A33 RX diversity lost

RXOCFFC2A34 Output voltage fault

RXOCFFC2A35 Optional synchronisation source

RXOCFFC2A36 RU database corrupted

RXOCFFC2A37 Circuit breaker tripped

RXOCFFC2A38 Default values used

RXOCFFC2A39 RX cable disconnected

RXOCFFC2A4 Reset, SW fault

RXOCFFC2A40 Reset, DXU link lost

RXOCFFC2A41 Lost communication to TRU

RXOCFFC2A42 Lost communication to ECU

RXOCFFC2A43 Internal configuration failed

RXOCFFC2A44 Indoor temperature above normal conditional range

RXOCFFC2A45 Indoor temperature below normal conditional range

RXOCFFC2A46 IDB parameter fault

RXOCFFC2A47 Auxiliary equipment fault

RXOCFFC2A5 Reset, RAM fault

RXOCFFC2A6 Reset, internal function change

RXOCFFC2A7 RXDA A/B amplifier current fault

RXOCFFC2A8 VSWR limits exceeded

RXOCFFC2A9 Power limits exceeded

RXOCFFC2B10 MAINS FAIL (External power source fail)

RXOCFFC2B11 ALNA/TMA Fault

RXOCFFC2B12 ALNA/TMA Degraded

RXOCFFC2B13 Auxiliary Equipment Fault

RXOCFFC2B7 DIP A (PCM link A lost)

RXOCFFC2B9 RBS door (RBS cabinet door open)

RXOCFRU0 DXU

RXOCFRU1 ECU

RXOCFRU10 ACCU

RXOCFRU11 Active cooler

RXOCFRU12 ALNA A

RXOCFRU13 ALNA BRXOCFRU14 Battery

RXOCFRU15 Fan

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RXOCFRU16 Heater

RXOCFRU17 Heat exchanger external fan

RXOCFRU18 Heat exchanger internal fan

RXOCFRU19 Humidity sensor

RXOCFRU2 Micro RBS

RXOCFRU21 Temperature sensor

RXOCFRU22 CDU HLOUT HLIN cable

RXOCFRU23 CDU RX in cable

RXOCFRU24 CURXOCFRU25 DU

RXOCFRU26 FU

RXOCFRU27 FU CU PFWD cable

RXOCFRU28 FU CU PREFL cable

RXOCFRU29 CAB HLIN cable

RXOCFRU30 CDU bus

RXOCFRU31 Environment

RXOCFRU32 Local bus

RXOCFRU33 Power communication loop

RXOCFRU34 RX antenna A

RXOCFRU35 RX antenna B

RXOCFRU36 Timing bus

RXOCFRU37 TX antenna A

RXOCFRU38 RX antenna B

RXOCFRU39 X bus

RXOCFRU40 Antenna

RXOCFRU5 CDU

RXOCFRU6 BFU

RXOCFRU7 PSU

RXOCFRU8 CDU_Cos

RXOCFRU9 BDM

RXOCONFC1B8 LAPD Q CG (LAPD Queue Congestion)

RXOCONFC2B8 LAPD Q CG (LAPD Queue Congestion)

RXORXFC1A0 RXDA Amplifier Current Fault

RXORXFC1A1 ALNA/TMA Fault

RXORXFC1A10 RX Indication Fault

RXORXFC1A11 CDU Output Voltage Fault

RXORXFC1A12 TMA CM Output Voltage Fault

RXORXFC1A3 RX EEPROM Checksum Fault

RXORXFC1A4 RX Config Table Checksum Fault

RXORXFC1A47 RX Auxiliary Equipment Fault

RXORXFC1A5 RX Synthesizer A/B Unlocked

RXORXFC1A6 RX Synthesizer C UnlockedRXORXFC1A7 Astra Dixie Communication Fault

RXORXFC1A8 RX Internal Voltage Fault

RXORXFC1A9 RX Cable Disconnected

RXOTFFC1A0 Optional Synchronization Source

RXOTFFC1A1 DXU-out EEPROM Checksum Fault

RXOTFFC1B0 EXT SYNCH (No Usable Esternal Reference)

RXOTFFC1B1 PCM SYNCH (No Usable PCM-Reference)

RXOTFFC2B0 EXT SYNCH (No Usable Esternal Reference)

RXOTFFC2B1 PCM SYNCH (No Usable PCM-Reference)

RXOTRXFC1A0 Reset, failed restart attempt

RXOTRXFC1A1 Reset, power on

RXOTRXFC1A10 Tora Dannie communication fault

RXOTRXFC1A11 DSP CPU communication fault

RXOTRXFC1A12 Terrestrial traffic channel fault

RXOTRXFC1A13 RF loop test fault

RXOTRXFC1A14 RU database corrupted

RXOTRXFC1A15 X bus communication fault

RXOTRXFC1A16 Initiation fault

RXOTRXFC1A17 X-interface fault

RXOTRXFC1A18 DSP fault

RXOTRXFC1A19 Reset, DXU link lost

RXOTRXFC1A2 Reset, switch

RXOTRXFC1A20 HW and IDB inconsistent

RXOTRXFC1A21 Internal configuration failed

RXOTRXFC1A3 Reset, watchdog

RXOTRXFC1A4 Reset, SW fault

RXOTRXFC1A5 Reset, RAM fault

RXOTRXFC1A6 Reset, internal function change

RXOTRXFC1A8 Timing reception fault

RXOTRXFC1A9 Signal processing fault

RXOTRXFC2A0 RX cable disconnected

RXOTRXFC2A1 RX EEPROM checksum fault

RXOTRXFC2A10 TX internal voltage faultRXOTRXFC2A11 TX high temperature

RXOTRXFC2A12 TX output power limits exceeded

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RXOTRXFC2A13 TX saturation

RXOTRXFC2A14 Voltage supply fault

RXOTRXFC2A15 VSWR/output power supervision lost

RXOTRXFC2A16 Non-volatile memory corrupted

RXOTRXFC2A18 DSP fault

RXOTRXFC2A19 High frequency software fault

RXOTRXFC2A2 RX configuration table checksum fault

RXOTRXFC2A20 RX initiation fault

RXOTRXFC2A21 TX initiation faultRXOTRXFC2A22 CDU bus communication fault

RXOTRXFC2A23 Default values used

RXOTRXFC2A25 TX maximum power restricted

RXOTRXFC2A3 RX synthesizer unlocked

RXOTRXFC2A4 RX internal voltage fault

RXOTRXFC2A5 Astra Dixie communication fault

RXOTRXFC2A6 Astra Tracy communication fault

RXOTRXFC2A7 TX EEPROM checksum fault

RXOTRXFC2A8 TX configuration table checksum fault

RXOTRXFC2A9 TX synthesizer unlocked

RXOTRXRU0 TRU

RXOTRXRU10 CDU to TRU PFWD cable

RXOTRXRU11 CDU to TRU PREFL cable

RXOTRXRU12 CDU to TRU RXA cable

RXOTRXRU13 CDU to TRU RXB cable

RXOTSFC1B3 TRA/PCU (Remote Transcoder/PCU Com. Lost)

RXOTXFC1A0 TX Offending

RXOTXFC1B0 CU/CDU Not Usable

RXOTXFC1B1 CDU/Combiner VSWR Limits Exceeded

RXOTXFC1B10 Astra Tracy Communication Fault

RXOTXFC1B11 TX Internal Voltage Fault

RXOTXFC1B12 TX High Temperature

RXOTXFC1B13 TX Outpu Power Limits Exceeded

RXOTXFC1B14 TX Saturation

RXOTXFC1B17 TX Indication Fault

RXOTXFC1B18 CU/CDU HW Fault

RXOTXFC1B19 CU/CDU SW Load/Start Fault

RXOTXFC1B2 CDU Output Power Limits Exceeded

RXOTXFC1B20 CU/CDU Input Power Fault

RXOTXFC1B21 CU/CDU Park Fault

RXOTXFC1B22 VSWR/Output Power Supervision Lost

RXOTXFC1B23 CU/CDU Reset, Power On

RXOTXFC1B24 CU/CDU Reset, Communication FaultRXOTXFC1B25 CU/CDU Reset, Watchdog

RXOTXFC1B26 CU/CDU Fine Tuning Fault

RXOTXFC1B27 TX Max Power Restricted

RXOTXFC1B28 CDU High Temperature

RXOTXFC1B29 SCU Voltage Supply Fault

RXOTXFC1B4 TX Antenna VSWR Limits Exceeded

RXOTXFC1B47 TX Auxiliary Equipment Fault

RXOTXFC1B6 TX EEPROM Checksum Fault

RXOTXFC1B7 TX Config Table Checksum Fault

RXOTXFC1B8 TX Synthesizer A/B Unlocked

RXOTXFC1B9 TX Synthesizer C Unlocked

RXOTXFC2A1 TX Diversity Fault

RXORXFC2A1 RX Path loss on A receiver side

RXOTRXFC2A39 RX Cable disconnected