Abstract
In recent years, there has been a growing interest in hybrid fiber-copper access solutions, as in fiber to the basement (FTTB) and fiber to the curb/cabinet (FTTC). The twisted pair segment in these architectures is in the range of a few hundred meters, thus supporting transmission over tens of MHz. This paper provides crosstalk models derived from measured data for quad cable, lengths between 75 and 590 meters, and frequencies up to MHz. The results indicate that the log-normal statistical model (with a simple parametric law for the frequency-dependent mean) fits well up to MHz for both FEXT and NEXT. This extends earlier log-normal statistical modeling and validation results for NEXT over bandwidths in the order of a few MHz. The fitted crosstalk power spectra are useful for modem design and simulation. Insertion loss, phase, and impulse response duration characteristics of the direct channels are also provided.
Highlights
Hybrid fiber-copper access solutions, such as fiber to the basement (FTTB) and fiber to the curb/cabinet (FTTC), entail twisted pair segments in the order of a few hundred meters— supporting transmission over up to 30 MHz
Very-high bit-rate digital subscriber line (VDSL) and the emerging VDSL2 draft are the pertinent high-speed transmission modalities for these lengths. This scenario is very different from the typical asymmetric digital subscriber line (ADSL) or high bit-rate digital subscriber line (HDSL) environment
For example, the shape of the far-end crosstalk (FEXT) power spectrum can be expected to be similar to the shape of the near-end crosstalk () power spectrum; while it is a priori unclear that and FEXT models [3, 4] developed and fitted to ADSL/HDSL bandwidths, will hold up over a much wider bandwidth
Summary
Hybrid fiber-copper access solutions, such as fiber to the basement (FTTB) and fiber to the curb/cabinet (FTTC), entail twisted pair segments in the order of a few hundred meters— supporting transmission over up to 30 MHz. Very-high bit-rate digital subscriber line (VDSL) and the emerging VDSL2 draft are the pertinent high-speed transmission modalities for these lengths. This paper describes the results of an extensive channel measurement campaign conducted by France Telecom R&D, and associated data analysis undertaken by the authors in order to better understand the properties of these very short copper channels. A large number of FEXT, and insertion loss (IL) channels were measured and analyzed, for lengths ranging from 75 to 590 meters and bandwidth up to 30 MHz. The main contribution is three-fold.
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