Access technologies : DSL and cable by James H. Green

By James H. Green

Show description

Read or Download Access technologies : DSL and cable PDF

Similar professional books

Counterfeit Integrated Circuits: Detection and Avoidance

This well timed and exhaustive learn deals a much-needed exam of the scope and results of the digital counterfeit exchange. The authors describe numerous shortcomings and vulnerabilities within the digital part provide chain, which may end up in counterfeit built-in circuits (ICs).

RNA turnover in eukaryotes: analysis of specialized and quality control RNA decay pathways

Particular complexes of protein and RNA perform many crucial organic services, together with RNA processing, RNA turnover, RNA folding, in addition to the interpretation of genetic info from mRNA into protein sequences. Messenger RNA (mRNA) decay is now rising as a massive keep an eye on aspect and an incredible contributor to gene expression.

Nurses! Test yourself in anatomy and physiology

"Many Anatomy and body structure (A&P) textbooks were written, so much of them are constrained by way of the absence of an important financial institution of self try out fabric. This e-book fills that area through offering the scholar engaged in lively studying possibilities to evaluate their studying in the entire center parts of A&P. The explanatory suggestions fabric following solutions to the try questions is superb.

Additional info for Access technologies : DSL and cable

Example text

The telephone wire in households is not a reliable termination, because wire quality varies greatly, unterminated wire runs are common, and telephone sets being unplugged or going off hook cause sharp impedance changes. Also, the telephone sets themselves are of varying quality, and, since they are connected in parallel across the line, the quantity of sets on the line affects the impedance. The splitter isolates the line from these variations. lite, an ADSL variation, to eliminate the need for a splitter.

A simple splitter separates voice from the data signal. The modems detect which channels may be impaired and spread the data to unimpaired channels. The upstream direction can use bins 6 to 38, which is about 25 to 163 kHz. 1 MHz) are used downstream. This method of modulation is inherently rate-adaptive because it uses all the available channels and ignores those that have poor transmission quality. For example, if an AM broadcast station is interfering with a band of frequencies, these bins are skipped.

Lite, an ADSL variation, to eliminate the need for a splitter. The objective was to enable subscribers to install the service without the need for a technician visit. 413. lite uses 96 upstream bins, which limits the throughput to about 400 kHz. 5 Mbps, depending on the length of the loop to the central office. ATM is used as the transport medium. lite is designed to retrain itself rapidly in the face of sudden impedance changes, as when a phone is lifted off-hook. 60 Access Technologies: DSL and Cable DSLAM The DSLAM separates voice-frequency signals from data at the CO end.

Download PDF sample

Rated 4.80 of 5 – based on 17 votes