Spectral Compatibility of ADSL and VDSL, Part 2: The Impact of ADSL on VDSL Performance
نویسندگان
چکیده
This contribution examines the effect of ADSL on VDSL when both reside in a single binder group. The potential loss in VDSL bit rate due to the presence of ADSL is qualified using channel capacity arguments. Of particular interest is the impact of the ADSL PSD beyond 1.104 MHz on VDSL performance, as high-level ADSL energy in this region can substantially impair achievable VDSL bit rates. The contribution shows that upstream VDSL channels are affected severely by ADSL NEXT, and downstream VDSL channels are degraded by ADSL FEXT. It is concluded that ADSL energy beyond 1.104 MHz substantially degrades VDSL performance in both the upstream and downstream directions. This contribution was presented as contribution 981t27r0 at the January 1998 ETSI TM6 meeting in Madrid, Spain. Project: VDSL, Spectral compatibility Title: Spectral Compatibility of ADSL and VDSL, Part 2: The Impact of ADSL on VDSL Performance Source:
منابع مشابه
Spectral Compatibility - a Prerequisite for Maximizing the Potential of Twisted-Pair Access Networks
The improvements of Digital Subscriber Line (DSL) technology enable telephone companies to optimize the utilization of their twisted-pair access networks in a flexible way, closely relating bandwidth demand and system costs. However, for the definition of VDSL systems as the next generation of DSL spectral compatibility with other DSL systems and with amateur radio systems has to be considered....
متن کاملQoS considerations for DMT-based ADSL and VDSL systems
Thanks to their high bandwidth ability, Asymmetric Digital Subscriber Lines (ADSL) and Very high speed DSL (VDSL) am access technologies that permit the transmission of several applications simultaneously on telephonic subscriber lines. Considering that these applications may require a different Quality of Service (QoS), and particularly different Bit Error Rates (BER), for transmission, this p...
متن کاملZipper: a duplex method for VDSL based on DMT
In this paper, we present a new duplex scheme, called Zipper, for discrete multitone (DMT)-based very high bit-rate digital subscriber line (VDSL) systems on copper wires. This scheme divides the available bandwidth by assigning different subcarriers for the upstream and downstream directions. It has high flexibility to divide the capacity between the up and downstream, as well as good coexiste...
متن کاملStandards project : T 1 E 1 . 4 : VDSL Title : Pulse Shaping with Zipper – Spectral Compatibility and Asynchrony Source : Telia Research AB Contact :
We have investigated what the effects of adding pulse shaping and windowing to a ZipperVDSL system would be. By adding short, pulse-shaped wings to the DMT symbol and accepting the, say, 3 % efficiency loss, the spectral sidelobes of the DMT-symbol are reduced. This provides several attractive features including the following: • The pulse shaping in the transmitter reduces the out of band power...
متن کاملDeciding on the right timing of VDSL roll-outs:A real options approach
Incumbents worldwide are faced with increased competition from various sides such as cable operators and other licensed operators (OLOs). Cable operators in Europe and North America have for a while offered broadband Internet service bundled with TV and telephony. The incumbents in most European countries offer ADSL services to the residential market. However, ADSL does, as opposed to VDSL, not...
متن کامل