Crosstalk originating from multiple high-speed data services in the same telephone bundle is a limiting factor for the maximum bit rate, the loop length and the number of data services that a bundle can support. (The Pennsylvania State University)

All current crosstalk mitigation techniques require precise knowledge of the crosstalk coupling functions between the twisted pair wires carrying DSL service within a cable binder. (Rice Scholarship)

Optical bidirectional transmission systems, such as subscriber systems, where two signals are carried over a single fibre are subject to optical crosstalk. This crosstalk causes an unwanted increase of the bit error rate at the receivers in both channels. (Institute of Physics and IOP Publishing)