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#REDIRECT [[Modified AMI code#B8ZS]] |
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'''B8ZS''' is an abbreviation for <b>bipolar with eight-zero substitution</b> . A [[T-carrier]] [[line code]] in which bipolar violations are deliberately inserted if [[user]] [[data]] contains a [[string]] of 8 or more consecutive zeros. |
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[[Category:Line codes]] |
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{{Redirect category shell| |
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<table border="1" width="50%" cellspacing="0" cellpadding="0"> |
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{{R to anchor}} |
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<tr> |
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{{R from merge}} |
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<td colspan="8">Original signal:</td> |
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}} |
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</tr> |
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<tr> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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</tr> |
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<tr> |
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<td colspan="8">B8ZS encoded signal (V=bipolar violation)</td> |
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</tr> |
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<tr> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">0</td> |
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<td align="center">V</td> |
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<td align="center">1</td> |
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<td align="center">0</td> |
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<td align="center">V</td> |
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<td align="center">1</td> |
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</tr> |
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</table> |
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B8ZS is used to ensure a sufficient number of transitions to maintain [[system]] [[synchronization]] when the user [[data stream]] contains an insufficient number of "ones" to do so. |
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B8ZS is used in the North American hierarchy at the T1 rate. When European E1 was developed much later than T1, it was then common knowledge that forcing 'ones' into a DS0 would corrupt data. E1 uses another method called High Density Bipolar Three ([[HDB3]]) code. |
Latest revision as of 11:11, 11 August 2022
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