A DSL system includes a multiple loop segment where K loops are bonded to
provide a multiple loop segment having up to (2K-1) communication
channels on which transmissions are vectored. The segment may be a drop
to a customer premises, an inter-pedestal link, or any other suitable
part of a larger DSL system. Generally the bonded loops are relatively
short, being 300 meters or less. Signal vectoring is used to increase the
speed and data carrying capability of the channels. In some embodiments,
an expanded frequency spectrum also can be used to increase the data
carrying capability of one or more of the channels. An impedance matching
circuit may be coupled to each end of the segment to provided efficient
transmission of data across the segment. A controller may provide control
signals used to operate the segment as a vectored system and, if desired,
frequency bandwidth control signals. The controller may monitor and/or
collect data and information from the DSL system to assist in generating
control signals. The controller can be a dynamic spectrum manager or DSM
Center that includes a computer system and/or other hardware to assist in
performing the required functions.