Azis Wisnu Widhi Nugraha, Azis Wisnu
Jurusan Teknik Elektro, Universitas Jenderal Soedirman Purwokerto Jl. MayJend. Sungkono Km. 5, Blater, Kalimahan, Purbalingga, 53371, Indonesia

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PENGARUH CODEC TERHADAP UNJUK KERJA VOIP PADA JARINGAN LOKAL UNSOED Widhi Nugraha, Azis Wisnu; Setiawan, Iwan; Setiawan, David
TRANSMISI Vol 17, No 4 Oktober (2015): TRANSMISI
Publisher : Jurusan Teknik Elektro Fakultas Teknik – Universitas Diponegoro

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Abstract

Universitas Jenderal Soedirman (UNSOED) memiliki jaringan lokal yang dapat diimplementasikan untuk sistem telekomunikasi berbasis VoIP. Dalam pengimplentasian VoIP, codec yang digunakan sangat berpengaruh terhadap kualitas suara yang dihasilkan. Untuk mengetahui pengaruh codec terhadap unjuk kerja VoIP pada jaringan lokal UNSOED maka perlu dilakukan penelitian terhadap parameter-parameter QoS yaitu delay, jitter, packet loss, MOS (Mean Opinion Score) dan bandwitdh. Pengujian ini dilakukan terhadap lima codec yang berbeda yaitu u-Law, a-Law, iLBC, GSM, dan speex. Dari hasil pengujian untuk kelima codec tersebut memiliki nilai yang berbeda-beda dan termasuk dalam kategori baik jika dibandingkan dengan nilai standar.   Kata kunci: VoIP, unjuk kerja VoIP, codec VoIP
Analisis Pengaruh Down Tilt Antena Untuk Mengurangi Kegagalanhandover Pada Jaringan Seluler GSM PT. Indosat, Tbk. Purwokerto Dewantara, Wahyu; Widhi Nugraha, Azis Wisnu; Purnomo, Widhiatmoko Hery
Dinamika Rekayasa Vol 6, No 2 (2010): Dinamika Rekayasa - Agustus 2010
Publisher : Jenderal Soedirman University

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Abstract

Handover is a process to guarantee the MS (Mobile Station) communication connection while moving for one cell to another cell. There are 10,89%-12,04% handover failure occurred between BTS Cilongok sector 1 and BTS Karanglewas sector 3 of PT. Indosat, Tbk,Purwokerto, whereas, thestandard is 2%-3%. Based on KPI (Key Performance Indicator) data most of handover failure is caused by long overlapping coverage (1,2851 km) as could be seen in BSC Controlled Inc. HO Fail at the amount of 9,69%-10,24%. Long overlapping coverage also reduce Rx Level signal quality to-94 dBm (threshold-90 dBm), and Rx Qual is 2,26 (it is still good enough if comparing to the threshold 5). Down tilt antenna method is used to overcome the overlapping coverage. Calculation result of down tilt antenna points out that the precise down tilt antenna to be applied in BTS Cilongok sector 1 is 3º and BTS Karanglewas sector 3 is 2,5º with number of overlapping coverage 78,2 m (appropriate to reference of PT. Indosat, Tbk Purwokerto�100 m). After down tilting antenna indicates that there is a reduction of handover failure because of overlapping coverage reduce to 0,01%- 0,02%, and total handover failure reduce to 0,62%- 1,39% . Meanwhile there is a raising in signal quality,it is Rx Level become-75 dBm and thebetter size of Rx Qual is 1.