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Service-specific data transmission over ADSL communications systems

: Hutzelmann, H.; Klinski, R.; Leischner, S.; Knorr, R.

Speidel, J. ; Informationstechnische Gesellschaft -ITG-:
Neue Kommunikationsanwendungen in modernen Netzen : Vorträge der ITG-Fachtagung am 28. Februar und 1. März 2002 in Duisburg, mit CD-ROM
Berlin: VDE Verlag, 2002 (ITG-Fachbericht 171)
ISBN: 3-8007-2680-7
Fachtagung Neue Kommunikationsanwendungen in Modernen Netzen <2002, Duisburg>
Fraunhofer ESK ()
service-specific data transmission; ADSL; asymmetrical digital subscriber line; quality of service; data link; DMT; discrete multi-tone modulation; signal-to-noise vector; SNR equation; ADSL reference diagram; bit loading spectra; ISDN; HDSL protocol

The paper proposes use of lower quality-of-service data links, which are not usable for ADSL (asymmetrical digital subscriber line) services, and refers to DMT (discrete multi-tone) modulation, and describes how QoS is defined by means of a signal-to-noise vector. It presents SNR equations, and shows an ADSL reference diagram. The paper plots bit loading spectra under noise conditions, proposes ADSL data rate increases from 64 kbit/s to 280 kbit/s, confirmed by experiments, using ISDN and HDSL protocols in a 590-pair cable.