CSE3213_06_LineBlockCodingW2012_Part_3

CSE3213_06_LineBlockCodingW2012_Part_3 - 11(4 Differential...

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Unformatted text preview: 11 (4) Differential Manchester – inversion in the middle of bit interval is used for synchronization – presence or absence of additional transition at the beginning of next bit interval identifies the bit 0 = transition , 1 = no transition perfect synchronization fine for long runs of 1s, but wastes band- width for long runs of 0-s used by IEEE 802.5 (Token Ring) Line Coding: Polar (cont.) 12 Line Coding: Bipolar Bipolar Line Coding – uses two non-zero and zero voltage level for representation of two data levels 0 = zero level ; 1 = alternating pos and neg level if 1 st ‘bit 1’ is represented by positive amplitude, 2 nd will be represented by negative amplitude, 3 rd by positive, etc . less bandwidth required than with Manchester coding (for any sequence of bits) loss of synchronization is possible for long runs of 0-s e.g. Bipolar-AMI. 13 Spectrum of Line Codes – can be divided into four broad categories – assume 1s & 0s independent and...
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CSE3213_06_LineBlockCodingW2012_Part_3 - 11(4 Differential...

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