Nowadays, the broadband residential access infrastructure remains one of the major research areas for NGN (next generation network). Apart from popular ADSL (asymmetrical digital subscriber loop), HFC (hybrid fiber-coax) and APON (ATM passive optical network), academic communities and industry are increasingly showing great concern about Ethernet technique in the subscriber access network. This...

The demand for high-speed Internet access is escalating high sales of ADSL routers. In-turn this has prompted individuals to attack and exploit the vulnerabilities in these devices. To respond to these threats, methods of acquisition and analysis are needed. The configuration data provides a wealth of information into the current state of the device. Hence, this data may be used to identify and...

In this paper, we address the problem of the end-to-end management of a heterogeneous public network. In the case study, the access part of the network is based on the ADSL technology for the provisioning of high speed IP over ATM to the customer and consists of ADSL network elements and ATM access switches. The core of the network is ATM based and provides connectivity to retailers, which in t...

Channel shortening is often necessary for demodulation of multicarrier signals, complexity reduction of maximum likelihood sequence estimation (MLSE), and can be used to suppress interference in multiuser detection. The Maximum Shortening SNR (MSSNR) and Minimum Mean Squared Error (MMSE) designs for channel shortening are popular in the literature due to their ease of implementation and near-op...

An all-digital implementation of multicarrier modulation called discrete multitone (DMT) modulation has been standardised for asymmetric digital subscriber line (ADSL), ADSL2, ADSL2+ and VDSL [1][3]. ADSL modems rely on DMT modulation, which divides a broadband channel into many narrowband subchannels and modulated encoded signals onto the narrowband subchannels [4], [5]. With advanced digital ...

The issue of radio frequency interference in Digital Subscriber Line (DSL) networks is of particular concern in urban areas with many strong radio sources nearby. This paper investigates in detail the mechanisms underlying the capacity reduction due to the presence of radio frequency signals from Amplitude Modulated (AM) broadcast stations in an ADSL network. An ADSL system, channel, and radio ...

Over the last years a number of operators have been deploying satellite-based consumer internet access services to reduce the digital divide and capture the market of households not covered by ADSL, cable or wireless broadband. These operators are proposing a step change improvement in the economics of consumer service, with lower terminal costs, broadband access with monthly fees comparable to...

This letter considers frame synchronization in nonsynchronized sampling discrete multi-tone (DMT) based asymmetric digital subscriber line (ADSL)/very high speed DSL (VDSL) systems in the presence of timing error. We propose a frame synchronization method which is based on the observation that the normalized correlation between two sequences separated by the FFT length is Cauchy random variable...

This paper presents the design and implementation of Java-based tools for accurate bandwidth measurement for xDSL (Digital Subscriber Line) networks, including the ADSL (Asymmetric DSL) case with different upstream and downstream bandwidths. First, a multi-packet bandwidth measurement technique is presented, based on the integration of packet-pair and filtering techniques. Considering the impor...