For BSNL Internal Circulation only E2-E3 Consumer Mobility Maintenance Issues of BTS
For BSNL Internal Circulation only
E2-E3
Consumer Mobility
Maintenance Issues of BTS
For BSNL Internal Circulation only
WELCOME
• This is a presentation for the E2-E3 Consumer
Mobility Module for the Topic: Maintenance
Issues of BTS
• Eligibility: Those who have got the Upgradation
from E2 to E3.
• This presentation is last updated on 15-3-2011.
• You can also visit the Digital library of BSNL to
see this topic.
For BSNL Internal Circulation only
AGENDA
To know the methods BTS maintenance
Important process under each method
For BSNL Internal Circulation only
BTS MAINTENANCE
To ensure the health of BTS in various generic
aspects deserving quick attention
Electricity power,
Engine Alternator,
Transmission link availability
Antenna alignment.
Equipment Hardware maintenance
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Preventive maintenance ( Once in Six Months)
Corrective maintenance.
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Preventive Maintenance
Aviation lamp -
Performance of sensor and lamp is to be
checked
Action:- Mask the sensor from sunlight and
check for glow of lamp. Glowing shows the good
condition. Remove the mask and thus expose
the sensor to sunlight. Glowing of lamp should
cease. Test results may be recorded in the
logbook. If the performance is not satisfactory,
replace the lamp/sensor which is faulty.
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Earth - Lightning spike earth, Tower earths DG
& Equipment earth to be checked. With Megger
take the value. Value should be less than 1 ohm
for each earth.
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Antennae & Tower: To be verified as andwhen any faults/defects (like high VSWR)reported or once in a year which ever is earlier.
Visual check of bolts/nuts and sample check oftheir tightness,
Greasing on foundation bolts to be done.
Check the Antenna connectors and theirtightness.
Check for tightness of antenna fixtures, u clampsetc..
For BSNL Internal Circulation only
Check for ingress of water (condition of weatherproofing in waveguide) etc
Check the orientation of antenna of each sectorand compare with the old records.
Check for the down tilt of antennae which alsomay be compared with old records .
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Power Supply
1. AC Power Supply
2. DC power Supply
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Check of Battery
Measure for Out put
(53.5+0.5V)
Measure for individual
cell output After 1 hr
discharge.
Tools required – screw driver / spanner sets
Testing Instrument required – Digital Multi
meter
Battery
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BTS Checking Procedure
Filter Fans Performance of eqpt
Check of clogging
due to
accumulation of
due to dust etc..
Cleaning of filter is
to be done.
Check
to
proper
working
of fan
units.
Check for VSWR &
Power for each DRX
in each sector
(VSWR for 900 MHZ
& 1800 MHZ cables
must be less than 1.3
Tools required – Spanner set, screw driver bit set
Testing instruments required – Power meter, Site
Master / BTS Tester
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2. Corrective Maintenance
Whenever any fault is reported from or duringperiodic visits/inspections, the correctivemaintenance is done for the BTS site inaccordance with alarm. After any majormodification in the BTS site like change inantenna settings, site configuration, power etc.,drive test and optimization of the site is done inaccordance with the Operating Procedure.
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Problems in the Network
Low network availability
Low network stability
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CAUSES OF BTS FAILURE
Coverage problem
Hand over problem
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REASON FOR BTS FAILURE
Power Failure and Low battery back up.
Non functioning of DG at the time of Powerfailure.
Transmission media failure.
Delay in restoration
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RF Issues
Overloaded BTS
Interference problem
Load balancing with adjacent BTS bytilting/lowering down/raising up BTS antennasshould be carried out whenever required
Fault/damage in Feeder cable (causes VSWRfault) , IF cable (mini link) requires change ofthese .
For BSNL Internal Circulation only
Procedure for handing equipment
faults.1. It the fault is of IDU/ODU, replaces the faultyunit with spare, subject to spare availability.
2. The fault unit is handed over the AMC holderfor repair.
3. It spare is not available, the fault isregistered at OMC-R (web site)
4. OMC-R, in turn, intimates the concernedvendor / AMC holder for rectification.
5. Monitors the corrective action taken by thevendor / AMC holder and acts accordingly.
For BSNL Internal Circulation only