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Published byNoemi Hollingshed Modified over 4 years ago

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Teknik Enkoding Pertemuan 08 Matakuliah: H0484/Jaringan Komputer Tahun: 2007

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Bina Nusantara Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menjelaskan teknik encoding

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Bina Nusantara Outline Materi Polar Bipolar Unipolar

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Bina Nusantara Digital to Digital Encoding

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Bina Nusantara Terminologi Unipolar – All signal elements have same sign Polar – One logic state represented by positive voltage the other by negative voltage Data rate – Rate of data transmission in bits per second Duration or length of a bit – Time taken for transmitter to emit the bit

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Bina Nusantara Terminologi Modulation rate – Rate at which the signal level changes – Measured in baud = signal elements per second Mark and Space – Binary 1 and Binary 0 respectively

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Bina Nusantara Digital to Digital Encoding

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Bina Nusantara Polar Encoding

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Bina Nusantara Bipolar Encoding

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Bina Nusantara Modulation Rate

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Bina Nusantara Unipolar Encoding - NRZL

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Bina Nusantara Nonreturn to Zero Inverted Polar, Non Return To Zero Inverted Non return to zero, inverted on ones Constant voltage pulse for duration of bit Data encoded as presence or absence of signal transition at beginning of bit time Transition (low to high or high to low) denotes a binary 1 No transition denotes binary 0 An example of differential encoding

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Bina Nusantara NRZ-L and NRZ-I

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Bina Nusantara RZ Encoding

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Bina Nusantara Biphase Manchester – Transition in middle of each bit period – Transition serves as clock and data – Low to high represents one – High to low represents zero – Used by IEEE 802.3 Differential Manchester – Mid bit transition is clocking only – Transition at start of a bit period represents zero – No transition at start of a bit period represents one – Used by IEEE 802.5

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Bina Nusantara Manchester and Diff. Manchester

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Bina Nusantara Multilevel Binary Use more than two levels Bipolar-AMI – zero represented by no line signal – one represented by positive or negative pulse – one pulses alternate in polarity – No loss of sync if a long string of ones (zeros still a problem) – No net dc component – Lower bandwidth – Easy error detection

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Bina Nusantara Bipolar AMI Encoding

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Bina Nusantara Perbandingan skema enkoding Error detection – Can be built in to signal encoding Signal interference and noise immunity – Some codes are better than others Cost and complexity – Higher signal rate (& thus data rate) lead to higher costs – Some codes require signal rate greater than data rate

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