ADSL(Asymmetric Digital Subscriber Line) transmission technology meets internet access requirement quite well and offers telephone companies a technology for connecting virtually all internet users at megabit rates.The ANSI (American National Standara Institute) proposes discrete multitone (DMT) modulation with DFT (discrete Fourier tranasform) bases [l] as the carriers for the ADSL system. Rec...

We investigate statistical properties of the traffic especially for ADSL broadband access platforms, which have been widely deployed in recent years. Measurement traces of aggregated traffic are evaluated on multiple time scales and show an unexpected smooth profile with less relevance of long range correlation than experienced for traffic from Ethernet LANs. A reason for the different characte...

Because of prevalent threats to SoHo based ADSL Routers, many more devices are compromised. Whilst an end-user may be at fault for not applying the appropriate security mechanisms to counter these threats, vendors should equally share the blame. This paper reveals that the lack of security related content and poor overall design could impact on end-users’ interpretation and willingness to imple...

Snails are widely assumed to be slow animals. Yet the literature on sluggish speed is surprisingly limited, and only few have actually bothered to measure and record it formally. Further, reported gastropod speeds vary widely with species and circumstance, ranging from 0.000023 to 0.0028 meters per second ([1] and [2], respectively). With that in mind, it is not surprising that the use of snail...

A Discrete Wavelet Multitone (DWMT) transceiver is proposed for the Asymmetrical Digital Subscriber Line (ADSL) channel, which promises greater subchannel spectral containment, as compared to the Fourier transform based conventional Discrete Multitone (DMT) system. Wavelet packet transform applied in DWMT system is robust against narrowband interference and impulse noise. It is also spectrally ...

The purpose of this project has been to analyse the requirements of the discrete multitone (DMT) transceiver part of an asymmetric digital subscriber line (ADSL) modem, and to suggest a design of a processor capable of providing the functionalities required by such a modem. The ADSL system was analysed and critical parts were pinpointed. These parts include Fourier transforms (DFT) and signal d...

Crosstalk from adjacent telephone subscriber loops is a primary impairment for digital subscriber line (DSL) service. This paper proposes a novel solution to identify various crosstalk sources in the current ADSL system. The algorithm takes the base power spectrum density (PSD) as a prior for each type of crosstalk, and compute a MSE solution based on the overall noise PSD. However, in a practi...