Abstract
The growing market for broadband access services is the driving force for Digital Subscriber Line (DSL) applications. As illustrated in Fig. 1.1, DSL allows for simultaneous transmission of digital data and the Plain-Old Telephone Service (POTS) signal on a single copper-pair. Among several DSL approaches the Asymmetric Digital Subscriber Line (ADSL) technology was standardized. Generally, ADSL can transport more than 8 Mbit/s from the Central Office (CO) to the customer (downstream) and more than 1 Mbit/s upstream. As shown in Table 1.1, several options were standardized such as ADSL+ to offer a higher bit-rate for downstream at the cost of reduced subscriber loop-length. Furthermore, line-testing features were introduced for performance monitoring requiring an analog bandwidth up to 1.1 MHz for the A/D-converter.
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Gaggl, R. (2013). A Feed-Forward Delta-Sigma Converter for ADSL. In: Delta-Sigma A/D-Converters. Springer Series in Advanced Microelectronics, vol 39. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34543-2_4
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DOI: https://doi.org/10.1007/978-3-642-34543-2_4
Publisher Name: Springer, Berlin, Heidelberg
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