5. Probable interference affected link Total 54 SDH links across the country suspected to be affected by external interference & unusual outage Scenario in 2009 8 Sylhet 4 Bogra 9 Khulna 18 Chittagong 5 Barisal 10 Dhaka No of link Region
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8. Case study : PTAGR1-BSBOA2 Interference affect: Location : Barisal Frequency : 7 GHz (U3) TX : 7498 MHz, RX : 7743 MHz Horizontal link: Vertical link: Average SES/Site/Week: RX : N/A (no interference) TX OFF RX : -35/-36 dBm TX ON BSBOA2 PTAGR1 RX : -52/-53 dBm (huge interference) TX OFF RX : -35/-36 dBm TX ON PTAGR1 BSBOA2 RX : N/A (no interference) TX OFF RX : -35/-36 dBm TX ON BSBOA2 PTAGR1 RX : -62/-68 dBm (huge interference) TX OFF RX : -35/-36 dBm TX ON PTAGR1 BSBOA2
9. Case study cont.. TGKCB1-TGCLP1 Location : Thakurgaon, Rajshahi Frequency : 8 GHz TX : 7955 MHz, RX : 8266 MHz Normal RX level: 31 dBm Fade margin: 38 dBm Interference affect: Average SES/Site/Week: RX : -53/-54 dBm (huge interference) TX OFF RX : -31/-32 dBm TX ON TGCLP1 TGKCB1 RX : N/A (no interference) TX OFF RX : -31/-32 dBm TX ON TGKCB1 TGCLP1