By James H. Green
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Additional info for Access Technologies: DSL and Cable
Other types of DSL separate voice from data with filters and do permit the use of a POTS line. High-speed modems encode information in symbols instead of a raw bit stream. By using complex coding schemes, a single symbol can be made to represent some number of consecutive bits. As we have discussed, T1/E1 uses a simple coding scheme that encodes only 1 bit per symbol. ISDN improves on that by using 2B1Q line coding. Each pair of bits represents one quaternary signal. Higher modem speeds are achieved with QAM.
CAP is closely related to QAM. The data rate is divided in two and modulated onto two orthogonal carriers phaseshifted 90˚ to one another. CAP systems use a combination of amplitude and phase states to encode the data. The two channels are combined, fed into a digital-to-analog converter, and transmitted. A simple filter separates voice and data. Hybrids and echo cancelers are not needed with CAP systems because the two directions of transmission are separate. The Digital Subscriber Line Access Technology 57 modems use adaptive equalization to overcome, to some degree, the effects of bridged tap, gauge changes, and splices.