maintenance network
TRANSCRIPT
Network Maintenance
SIMS
Understanding Cell site Infrastructure
A cell site is a cellular telephone site where antennas and electronic communications equipment are placed, usually on a radio mast, tower or other high place, to create a cell (or adjacent cells) in a cellular network. The elevated structure typically supports antennas, and one or more sets of transmitter/receivers transceivers, digital signal processors.A cell site is sometimes called a "cell tower", even if the cell site antennas are mounted on a building rather than a tower. In GSM networks, the technically correct term is Base Transceiver Station (BTS), and colloquial British English synonyms are "mobile phone mast" or "base station". The term "base station site" might better reflect the increasing co-location of multiple mobile operators, and therefore multiple base stations, at a single site. Depending on an operator's technology, even a site hosting just a single mobile operator may house multiple base stations, each to serve a different air interface technology (CDMA2000 or GSM, for example).Telecom InfrastructureBasically a cell site consists of electronic (active) and non-electronic infrastructure.
•Electronic infrastructure includes base tower station, microwave radio equipment, switches, antennas, transceivers for signal processing and transmission.•Non-electronic infrastructure includes tower, shelter, air-conditioning equipment, diesel electric generator, battery, electrical supply, technical premises and easements & pylons that account for nearly 60 percent of network rollout costs
Module1 Intro to SIMS
2
3
4
Routine Maintenance
Generator Maintenance
Fault Resolution & Other Terms
1 Intro to SIMS
Site Integrated Maintenance
SIMS – Site integrated Maintenance Services
Passive-
Routine and Non Routine
Active- Link
Maintenance
SIMS
Intro to SIMsPassive Maintenance comprises of:
• Routine Maintenance
• Non Routine Maintenance
Intro to SIMsRoutine Maintenance comprises of the following task:
DC Power maintenanceDiesel Delivery and ManagementSecurity Services Mechanical Maintenance which include Fence, Shelter and AC maintenanceTower member maintenanceJanitorial Cleaning
Above are undertaken monthly expect tower and mechanical maintenance which are quarterly
Non routine maintenance takes charge of sudden fault repairs(Minor/Major) such as complete/partial overhauling(Knocked Engine), fan belt replacement, PHCN Infrastructures and other services not captured in the SOW. Necessary approval must be sought before implementation.
2 Routine Maintenance
Routine MaintenanceRoutine Maintenance includes activities that need to be carried out on a regular basis on intervals as defined in the MTN Contract. The regular maintenances are contractual obligations aiming at prolonging the life expectancy of the MTN equipments/assets through preventive actions and early detections of problematic issues.
Well planned and systematic execution of Routine Maintenance has also direct impact on the quality of deliverables. They allow reduction and better management of unexpected events. Thereby, reduces the strain and stress imposed on the team and avoid the fire fighting scenario.
TERMS
MTTR - Mean Time To Resolve( 2hrs)MTBF - Mean Time Before Breakdown
NB MTBF> MTTR = Zero down time
Routine MaintenanceSLA FOR MTN ROUTINE MAINTENANCE
MAIN DELIVERABLES TASK WKLY
Every 2 WKS Mthly 1/4ly Yrly 250 Hrs 1000 Hrs 2400Hrs
Tower
Tower X X Foundation X X Obstruction Lighting X X Earthing System X X Locking Devices X Vertical Alignment X
Mechanical
Fence X Equipment Housing X Air Conditioning Unit X
Site SecurityAssessment X Recommendation X
DC MaintenanceRectifier X Battery X UPS X
Utility
PHCN Connection X PHCN Status & Quality X PHCN Related Problem X
Generator
Generator Running X X X ATS X AVR X Diesel Level Verification X
JanitorFumigation X General site cleaning X
3 Generator Maintenance & Other Services
Generator MaintenanceGenerators are serviced depending on the Run Hour, brand, capacity and model as stated below:
ASSUMPTION
S
SITE WITH PHCN SITE WITHOUT PHCNGEN TYPE : 1000RH GEN TYPE : 250RH GEN TYPE : 1000RH GEN TYPE : 250RH
MONTHLY
SERVICING FREQ
in DAYS
MATERIALS
MONTHLY
SERVICING FREQ
MATERIALS
Oil Filter
Fuel Filter
Engine Oil
MONTHLY SERVICING FREQ
Oil Filter - 1pc/Serv
Fuel Filter
Engine Oil
Oil Filter
Fuel Filter
Engine Oil
MONTHLY SERVICING FREQ
Oil Filter - 1pc/Serv
Fuel Filter
Engine Oil - 8ltrs/Serv = 25ltrs
BEST CASE : PHCN AVAILABILTY - 12hrs. GEN - 12hrs
83
1 1 55ltrs
21 1 1
8 ltrs
42
1 1 55ltrs 10.416667 3 3 25
ltrs
AVE CASE : PHCN AVAILABILTY - 6hrs. GEN - 18hrs
56
14 2 2
WORST CASE : PHCN AVAILABILTY - 3hrs. GEN - 21hrs
48
12 3 3
HYBRID : AVAILABILTY - 8hrs. GEN - 16hrs
63
16 2 2
Other ServicesDiesel Delivery – This is a function of generator age, load and site capacity as volume and consumption are dependent on above variables
15kva BTS site without PHCN – 1850 ltrs27kva Backbone site without PHCN – 2400ltrs15kva BTS site with PHCN – 1100ltrs
After every diesel delivery , it is important to record the generator RH as this helps to determine generator daily consumption.
Timely and accurate diesel delivery help reduce DOWNTIME to the minimal as this(Diesel) represent the hub of MS.
4 Fault Resolution & Other Terms
Fault ResolutionAll fault are expected to be cleared within the allowable time limit – 2hrs, failure reduces SMC’s availability(98%) measured in percentage. Else penalty of 113,500/ hour starts counting.
Mobile gen must be deployed to rescue site during major fault that cannot be resolved within 2hrs to avoid penalty charges.
Ref must provided by MTN NMC before site access
Battery back must be in top gear to avoid unnecessary down time
All alarm system must be wired and functional
All opened ticket must be closed via necessary feedback from field engr. to MTN NMC/NOC.
Other TermsMean time between failures (MTBF) : is the predicted elapsed time between inherent failures of a system during operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system. Mean Time To Repair (MTTR) : is the time needed to repair a failed hardware module.Availability: Availability of the module is the percentage of time when system is operational. Availability of a hardware/software module can be obtained by the formula given below. A = MTBF/ MTBF+ MTTR
Failures : Total period an equipment was unable to achieved its main objectives.Remedy : Place where fault log are stored/ Kept for future reference