| 摘要 |
A digital subscriber line (DSL) modem for a service area interface, which controls the power of its downstream transmissions to minimize far-end crosstalk (FEXT), is disclosed. The disclosed modem has an interface to a low-attenuation upstream facility, such as fiber optic, and includes a digital transceiver and an analog front end that is coupled to a twisted-pair wire facility in a binder. The modem also includes a memory location for storing the feeder distance between a DSL central office and the service area interface, the service area interface also coupled to a subscriber of the CO-fed communications via twisted-pair wire. Power cutback levels are applied to the downstream transmissions from the modem according to the feeder distance, so that the FEXT on the CO-fed signal is minimized without undue data rate degradation.
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