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DS2196 bảng dữ liệu(PDF) 96 Page - Dallas Semiconductor |
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DS2196 bảng dữ liệu(HTML) 96 Page - Dallas Semiconductor |
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96 / 157 page ![]() DS2196 96 of 157 16. ERROR INSERTION FUNCTION An Error insertion function is available in each formatter of the DS2196 and is used to create errors in the payload portion of the T1 frame in the transmit path. See Figure 21-7 for location. Errors can be inserted over the entire frame or the user may select which channels are to be corrupted. Errors are created by inverting the last bit in the count sequence. For example if the error rate 1 in 16 is selected, the 16th bit is inverted. F-bits are excluded from the count and are never corrupted. Error rate changes occur on frame boundaries. Error insertion options include continuous and absolute number with both options supporting selectable insertion rates. Transmit error insertion setup guideline. 1. Enter desired error rate in the ERC register. Refer to table 16-1 for available rates. Note: If ER3:0 = 0, no errors will be generated even if the constant error insertion feature is enabled. 2A. For constant error insertion set CE = 1 (ERC.4). or 2B. For a defined number of errors: - Set CE = 0 (ERC.4) - Load NOE1 & NOE 2 with the number of errors to be inserted - Toggle WNOE (ERC.7) from 0 to 1, to begin error insertion |
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