BROADBAND ACCESS METHODS High-speed access is becoming increasingly popular for connecting to the Internet and to corporate networks. The term “high-speed” is generally taken to mean transfer speeds above the 56Kbps of analog modems, or the 64 to 128Kbps speeds of ISDN. There are a number of technologies that provide transfer rates from 256Kbps to 1.544Mbps and beyond. Some offer asymmetrical u...

Crosstalk canceller plays a key role in achieving high bit rates in wire line multicarrier Asymmetric Digital Subscriber Line (ADSL) systems. Adjacent systems within a cable binder that transmit or receive data in the same frequency range can create crosstalk interference. In an ongoing effort to study and improve the performance of ADSL Central office and CPE modems, the effect of Near-end cro...

This paper presents some measurements supporting the spectral compatibililty of a T1.413 FDD PSD mask compliant non-stationary service with a DMT service that is using bit swapping. EtherLoop technology modems use a Spectrum Manager function to monitor the line between bursts, and upon detecting significant coupling with an ADSL type service, switch to a safe mode of operation [1]. This safe mo...

With the advancement in Internet Technology, human life style is rapidly changing with increasing demand for useful home networking products and their optimal solutions.Availabilty of some crucial factors like consumer electronics, VoIP, multi-user internet gaming, video services etc is major benefit because these factors are contributing at large scale to the increasing need of home networking...

In the present paper we shall present our methodology to manage the Operational Knowledge (OK). The OK could be defined as a set of procedures or norms used by telecommunication operators to construct a genuine strategy tailored to the peculiarities of a given situation. Therefore, we have defined an Operational Knowledge Management Framework (OKMF) which has been developed taking into account ...

Broadcast digital subscriber lines (BDSL) can provide a cost-effective architecture to deploy digital broadcast services in the near future by utilizing the in-place unshielded twisted-pairs. In the BDSL system, all broadcasting channels can share the same transmitter to reduce the cost. Because all twisted-pairs transmit the same BDSL signal in the downstream direction, both nearand far-end cr...

Characterizing peer-to-peer overlays is crucial for understanding their impact on service provider networks and assessing their performance. Most popular file exchange applications use distributed hash tables (DHTs) as a framework for managing information. Their fully decentralized nature makes monitoring and users tracking challenging. In this work, we analyze KAD, a widely deployed DHT system...

In asymmetric digital subscriber lines (ADSL), the available bandwidth is divided in subcarriers or tones which are assigned to the upstream and/or downstream transmission direction. To allow efficient bidirectional communication over one twisted pair, echo cancellation is required to separate upstream and downstream channels. In addition, intersymbol interference and intercarrier interference ...

The discrete multitone (DMT) modulation/demodulation scheme is the standard transmission technique in the application of asymmetric digital subscriber lines (ADSL) and very-high-speed digital subscriber lines (VDSL). Although the DMT can achieve higher data rate compared with other modulation/demodulation schemes, its computational complexity is too high for costefficient implementations. For e...