Patent ID: 9374132
Filing Date: 2016-06-21
CPC Classification: H04B,H04L,H04M

Claim Text:
1. A Digital Subscriber Line (DSL) transmitter for measuring crosstalk among lines of a DSL cable, the DSL transmitter comprising: a controller module configured to generate data signals for transmission on the DSL cable, the DSL cable including a first DSL line and a legacy DSL line; and a crosstalk module configured to pass the data signals to the DSL cable during a data mode, and to pass crosstalk signals to the DSL cable during a first test mode or a second test mode, wherein, during the first test mode, the crosstalk signals include a first test signal designated for transmission on the first DSL line and the sync symbol designated for transmission on a plurality of additional DSL lines, wherein, during the second test mode, the crosstalk signals include a legacy test signal designated for transmission on the legacy DSL line and the sync symbol designated for transmission on the plurality of additional DSL lines, wherein the legacy test signal is different from the first test signal and is constructed using the first test signal, wherein the first test signal is an O-P-Vector-1 signal, wherein the crosstalk module includes a legacy crosstalk module configured to reduce at least one of a frequency spectrum or a power spectrum density of a corresponding one of the data signals designated for the legacy DSL line, and wherein the legacy crosstalk module is further configured to superpose the O-P-Vector-1 signal on the reduced one of the data signals to generate the legacy test signal.