Crosstalk measurements in DSL rings

Due to the inverse relation between cable length and transmission bit rate, many current DSL deployments do not truly benefit from the wide spectrum of VDSL2. In this paper, we propose a new DSL network technology, called DSL Rings (DSLRs), to overcome the challenge of long cable runs in DSL networks. Utilizing MIMO techniques from the central office to the pedestal and a ring network between the pedestal and the houses, DSLR achieves aggregate transmission rates up to 225 Mbits/s. Measurements on Cat3 cables are conducted to characterize crosstalk interference that is unique to this new architecture. The achievable symbol bit rates are then calculated using these measurements. The results demonstrate the effectiveness of the proposed architecture in providing VDSL2 technology over fiber to the exchange (FTTEx) deployments.