Pim test vms1 jan, 2012 compatibility mode

Passive Intermodulation (PIM) is a nonlinear response of two or more signals of different frequencies mixing together in a passive device, e.g. antenna, cable, connector and splitter. In the pass, PIM was of little concern to passive device designers. But now, due to frequency planning of the modern communication network, the usage of higher power transmitters , and more sensitive receivers in base stations, PIM has become a very serious and challenging problem for mobile operators, equipment vendors and component manufactures. In a PIM with sufficient magnitude generated from a transmitter falls within an adjacent receiver channel, it caused a serious interference to the base station receiver and will largely degrade the network quality of service. The problem must be overcomed in order to improve network performance for mobile operators and maintain high quality for subscribers

PIM TEST REPORT with VSM MOBIFONE CENTER Created by Tuoi Ngo Hanoi capital , Vietnam – Jan, 2012 CONTENT I II III IV V Why need PIA – Passive Intermodulation Analyzer? PIA product introduction Site list for test Summarization and Test Results Further recommendations, considerations Passive Intermodulation (PIM) is a nonlinear response of two or more signals of different frequencies mixing together in a passive device, e.g antenna, cable, connector and splitter In the pass, PIM was of little concern to passive device designers But now, due to frequency planning of the modern communication network, the usage of higher power transmitters , and more sensitive receivers in base stations, PIM has become a very serious and challenging problem for mobile operators, equipment vendors and component manufactures In a PIM with sufficient magnitude generated from a transmitter falls within an adjacent receiver channel, it caused a serious interference to the base station receiver and will largely degrade the network quality of service The problem must be overcomed in order to improve network performance for mobile operators and maintain high quality for subscribers Besides macro network configurations, there are causes from the physical interface onsite for poor KPI today, and passive intermodulation (PIM) test are used as a key indicator for site audit • Antenna, feeder system aging over the time, performance degradation caused by product materials & environment • Low quality feeder, passive, antenna system deployed without qualification test • Poor Workmanship during installation without proper testing procedure • Lack of preventive testing instruments & troubleshooting ` II PIA product introduction Passive Intermodulation Anlyzer PIA Data Sheet II PIA product introduction II PIA product introduction SITE INFORMATION Site Name Inspection Onsite Date Site type Ha Dinh Jan 6, 2012 New site Nguyen Trai Jan 6, 2012 Co site Jan 9, 2012 Co site Chua Ha IV Summarization and Test Results PIM TEST_ VMS1_ Jan, 2012 1.Summarization Site Audit Record No Site Name Actual Onsite Onsite Antenna Date information Ha Dinh 900/1800 Dual band antenna (Agison-PN 2127010548 10) 6-Jan Site type New Site Cell PIM test before Audit Cell A Pass Nguyen Trai Chua Ha 1800 Single band 9-Jan antenna (N/A PN) Co Site None PIM after Audit Passed Cell B Pass None - Cell C Pass None - Cell A 900/1800 Dual band 6-Jan antenna (Kathrien -PN 1011856/1) Problems found during Deal with the problem Audit Cell B 01 Failed and 01 Low PIM result Pass Failed Low PIM result Cell C Pass None Cell A Pass None Co Site Bad workmanship, antenna is aging and need to be considered for replacement Antenna is aging and need to be considered for replacement The PIM result is still passed, however it's not really good, ( expecting the result is less than - 110 dBm for good performance) The PIM result is still passed, however it's not really good, ( expecting the result is less than - 110 dBm for good performance) Cell B 01 Failed and 01 Low PIM result Pass Bad workmanship , tightened connector Cell C 01 Failed and 01 Low PIM result Pass Bad workmanship , tightened connector Remark PIM result is not really good, less than 110 dBm is better PIM result Passed Bad workmanship, antenna is aging, 01 Failed and 01 need to have plan Pass for fixing and antenna repalcement Antenna is againg , Passed need to have plan for replacement Passed PIM result is not really good, less than 110 dBm is better PIM result Bad workmanship, and some cells PIM result themselves are not really good , ( less than -110 dBm is Passed considered as 01 Failed and 01 good result) Pass Passed IV Summarization and Test Results Test Results Site name: Ha Dinh Antenna information: site with antenna systems  2G:  900/1800 Dual band antenna (Kathrein 741322) Antenna port PIM threshold value (dBm) PIM actual test value (dBm@MHz) Remark Cell A-Dual band antenna port A ≤ -90 -97.8@1730.0 Pass Cell A-Dual band antenna port B ≤ -90 -92.4.9@1730.0 Pass Cell B-Dual band antenna port A ≤ -90 -92.3@1730.0 Pass Cell B-Dual band antenna port B ≤ -90 -98.9@1730.0 Pass Cell C-Dual band antenna port A ≤ -90 -95.2@1730.0 Pass Cell C-Dual band antenna port B ≤ -90 -114.3@1730.0 Pass  3G: N/A IV Summarization and Test Results Test Results Site name: Ha Dinh – Cell A Dual band antenna port A TEST RESULT Dual band antenna port B IV Summarization and Test Results Test Results Site name: Ha Dinh – Cell B Dual band antenna port A TEST RESULT Dua band antenna port B IV Summarization and Test Results Test Results Site name: Ha Dinh – Cell C Dual band antenna port A TEST RESULT Dual band antenna port B IV Summarization and Test Results Test Results Site name: Nguyen Trai Antenna information: site with antenna systems  2G:  900/1800 Dual band antenna (Kathrein 1011856/1)  3G: N/A Cell A-TX1 feeder itself is shorter than others and not fixed by cable tight shaking up in the air and due to antenna age which caused to bad PIM result -33.4 dBm Antenna port PIM threshold value (dBm) PIM actual test value (dBm@MHz) Remark Cell A-Single band antenna port A ≤ -90 -33.4@1730.0 Failed Cell A-Single band antenna port B ≤ -90 95.5@1737.0 Pass Cell A-Single band antenna port A ≤ -90 Cell B-Single band antenna port B ≤ -90 -78.8@1732.0 Failed Cell B-Single band antenna port A ≤ -90 -90.1@1748.0 Pass Cell C-Single band antenna port B ≤ -90 -90.2@1760.0 Pass -82.5@1782.0 Failed Loose connections between surge arresters and 7/8 inch indoor connectors IV Summarization and Test Results Test Results Site name: Nguyen Trai – Cell A Dual band antenna port A TEST RESULT Dual band antenna port B IV Summarization and Test Results Test Results Site name: Nguyen Trai – Cell B Dual band antenna port A TEST RESULT Dua band antenna port B IV Summarization and Test Results Test Results Site name: Nguyen Trai – Cell C Dual band antenna port A TEST RESULT Dua band antenna port B IV Summarization and Test Results Test Results Site name: Chua Ha Antenna information: site with antenna system Antenna port PIM threshold value (dBm) PIM actual test value (dBm@MHz) Remark Cell A-Single band antenna port A ≤ -90 -93.7@1766.0 Passed Cell B-Single band antenna port B ≤ -90 -90.1@1768.0 Passed  2G:  1800 Single band antenna: N/A PN and serial number Cell B-Single band antenna port A ≤ -90 -93.2@1774.0 Cell B-Single band antenna port B ≤ -90 -95.6@1730.0 Cell C-Single band antenna port A ≤ -90 -90.7@1760.0 Cell C-Single band antenna port B ≤ -90 -83.0@1733.0 At the beginning, PIM resulted had been not passed with result 84.2@1770.0 But after tightening connector, the result was getting better and passed the threshold finally Passed Passed Loose connection indoor with PIM result:77.1@1734.0.And after tightening connector, the result was getting better however it wasn’t still not good enough to pass threshold -90dBm, need to check other elements in order improving PIM result itself Bad workmanship -Loose connectors tightening cause to bad PIM result , fixed OK IV Summarization and Test Results Test Results Site name: Chua Ha – Cell A Single band antenna port A TEST RESULT Single band antenna port B IV Summarization and Test Results Test Results Site name: Chua Ha– Cell B1 Single band antenna port A before connector tightening TEST RESULT Single band antenna port A after connector tightening IV Summarization and Test Results Test Results Site name: Chua Ha– Cell B2 TEST RESULT Single band antenna port B IV Summarization and Test Results Test Results Site name: Chua Ha – Cell C1 TEST RESULT Single band antenna port B IV Summarization and Test Results Test Results Site name: Chua Ha – Cell C1 Single band antenna port B before connector tightening TEST RESULT Single band antenna port B after connector tightening V Further recommendations, considerations After inspecting some MobiFone sites in Hanoi capital, we have conclusions as below: Advantages: - Inspected sites are high configuration with almost high traffic at every hour in day - All BTSs with full capacity of hardware are working normal in good condition of maintenance Disadvantages: During the time doing test PIM value – Passive Intermodulation with some random sites we found some cells with high PIM interference caused to bad high drop rate, bad call quality (specially uplink), bad coverage (power loss) And finally we found out the reasons ( please refer the previous slide for details for each specific case) •Some cells even are passed PIM interference threshold – 90 dBm, however we are expecting PIM results should be less than -110 dBm as good one for excellent network performance  •Some Antenna, Feeder System aging over the time, performance degradation caused by product materials & environment • Poor workmanship : Loose contacts and rotating joints, cross cell,… etc The cells with problems such as poor workmanship, aging products …caused to high interference (specially for ICMB 3~5 level) which have been much improved performance after doing site audit THANK YOU www rosenbergerap.com www netop-technology.com