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Two other formulas for C per and L per have been used in the literature, with the arccosh replaced by ln(2D/dÀ1) or ln(2D/d). Both are valid approximations if D/d ) 1, but that is not true for UTP. The former would be exact if the current were uniformly distributed: either throughout the wire at low frequencies or around the surface at high frequencies. 2) are about 20% higher than those given by ln(2D/dÀ1). The ln(2D/d) form is used mainly because of its simplicity; the resulting values are about 7% higher than the exact ones.

Therefore, if the subscriber loop is to be used only for access to the STN, there is no need for a bandwidth greater than 4 kHz. At low frequencies UTP acts like a distributed RC circuit, and its response droops across the 4-kHz voice band (by as much as 12 dB on long loops). That droop reduced the capacity of early telegraphy systems and degraded the voice quality, so Heaviside7 proposed that lumped inductors be added in series at regular intervals along the loop. A common con®guration in the United States is 88-mH coils inserted every 6000 ft; a 26-AWG loop so loaded would be designated 26H88.

Note that there is only a single size for the interleave buffer for all VPI/VCIs that use that path. The buffer depth is chosen to be commensurate with the maximum impulse noise burst expected. It may be on the order of 40 or 50 ms per ADSL link. Therefore, there needs to be a new mechanism to specify the latency path to VPI/VCI mapping for SVCs. 5 for information on ADSL Forum documents. , odd VPI/VCI for fast path; even for interleave path) has yet to be determined by the ADSL or ATM Forums. Once the latency path mapping has been determined, a new ATM layer function must assign each cell to be transmitted to the designated latency path.

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A simplified guide to using the MCS51 on-chip UART


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