diff --git a/ex10/kn10.pdf b/ex10/kn10.pdf index 567b8eb..ece7dd0 100644 --- a/ex10/kn10.pdf +++ b/ex10/kn10.pdf Binary files differ diff --git a/ex10/kn10.tex b/ex10/kn10.tex index ec4a2b8..7a11970 100644 --- a/ex10/kn10.tex +++ b/ex10/kn10.tex @@ -1,4 +1,4 @@ -\documentclass[a4paper,12pt]{scrartcl} + \documentclass[a4paper,12pt]{scrartcl} \usepackage[ngerman]{babel} \usepackage{graphicx} %BIlder einbinden \usepackage{amsmath} %erweiterte Mathe-Zeichen @@ -82,6 +82,8 @@ \end{corr}} \newcommand{\enot}[2]{#1 \cdot 10^{#2}} +\newcommand{\kHz}{\mathit{kHz}} +\newcommand{\mHz}{\mathit{mHz}} \begin{document} %\header{BlattNr}{Tutor}{Abgabedatum}{Vorlesungsname}{Namen}{Semester}{Anzahl Aufgaben} @@ -106,15 +108,15 @@ \end{enumerate} \Aufgabe{Broadband Internet Access}{3+3+3+3+3+3+3+3+3+3} \begin{enumerate} - \item bla - \item bla - \item bla - \item bla - \item bla - \item bla - \item bla - \item bla - \item bla - \item bla + \item An \textit{ADSL modem} modulates and demodulates the data using DMT and creates downstream and upstream channels. + \item A \textit{DSL access multiplier} does the same at the ISP side. + \item The typical range is $12000ft = 3657.6m$. + \item The router assigns the IP address from the \textit{BRAS} to the customer using the \textit{PPP} protocol. + \item ADSL uses $26 - 108 \kHz$ for upstream and $138 - 1104 \kHz$ for downstream.\\ Cable uses $5 - 42 \mHz$ for upstream, $54 - 450 \mHz$ for video and $550 - 750 \mHz$ for downstream. + \item The data from separate coaxial cables are multiplexed on a single shared medium. + \item Capacity sharing is realized with \textit{frequency division multiplexing} and with \textit{statistical time division multiplexing}. + \item No, the cable modem receives all encrypted data broadcasted by the CMTS. The CM however only extract the data from the cable which is addressed to itself. + \item Multiple CM fight for a minislot, CMTS assigns these minislots to the competing CMs. The CMs uses the assigned minislot for data transmission to the CMTS. + \item The cable modem on the customer premise is configured and controlled by the CMTS using DOCSIS and layer 1 and 2 protocols. \end{enumerate} \end{document}