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CD22103A bảng dữ liệu(PDF) 6 Page - Intersil Corporation |
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CD22103A bảng dữ liệu(HTML) 6 Page - Intersil Corporation |
6 / 7 page 73 Definition of HDB3 Code Used in CD22103A HDB3 Transcoder (As Per CCITRT G703 Annex Recommendations) and Error Detection Coding Of A Binary Signal Into An HDB3 Signal Is Done According To The Following Rules: 1. HDB3 signal is pseudoternary; the three states are denoted B+, B-, and 0. 2. Spaces (zeros) in the binary NRZ signal are coded as spaces in the HDB3 signal. For strings of four spaces, however, special rules apply (See Item 4 below). 3. Marks (ones) in the binary signal are coded alternately as B+ and B- in the HDB3 signal (alternate mark inversion). Violations of the rule of alternate mark inversion are intro- duced when coding strings of four spaces (See Item 4 below). 4. Strings of four spaces in the binary signal are coded according to the followinq rules: A. The first space of a string is coded as a space if the polar- ity of the preceding mark of the HDB3 signal has a polarity opposite to the preceding violation and is not a violation by itself; it is coded as a mark, i.e., not a violation (i.e., B+ or B-), if the preceding mark of the HDB3 signal has the same polarity as that of the preceding violation or is by itself a violation. This rule ensures that successive violations are of alter- nate polarity so that no DC component is introduced. B. The second and third spaces of a string are always coded as spaces. C. The last space of a string of four is always coded as a mark, the polarity of which is such that it violates the rule of alternate mark inversion. Such violations are denoted V+ or V- according to their polarity. FIGURE 5. CRX RECONSTRUCTION REQUIREMENTS FIGURE 6. RECEIVER ALARM-INHIBIT-SIGNALS TIMING WAVEFORMS FIGURE 7. RECEIVER ERROR-SIGNALS TIMING WAVEFORMS CKR CRX 50% 50% tP tD τ τ CRX NRZ - OUT DATA RAIS AIS CRX +HDB3 IN -HDB3 IN ERR CD22103A |
Số phần tương tự - CD22103A |
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Mô tả tương tự - CD22103A |
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