\section{Hardware Building Blocks}

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\begin{slide}{}

   \subsection{Nodes}

   Assume general-purpose (programmable) computers; e.g., workstations.
   Sometimes replaced with special-purpose hardware.

   \pichere{host_arch.eps,height=3in}

   \begin{sitem}
      \item Finite memory (implies limited buffer space)
      \item Connects to network via a {\it network adaptor}
      \item Fast processor, slow memory
   \end{sitem}
\end{slide}

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\begin{slide}{}

   \subsection{Links}

   Sometimes you install your own

   \begin{center}
   \begin{tabular}{|l|l|} 
   \hline
      Category 5 twisted pair & 10-100Mbps, 100m \\
      50-ohm coax (ThinNet) & 10-100Mbps, 200m \\
      75-ohm coax (ThickNet) & 10-100Mbps, 500m \\
      Multimode fiber & 100Mbps, 2km \\
      Single-mode fiber & 100-2400Mbps, 40km\\
   \hline
   \end{tabular}
   \end{center}

   \bigskip\bigskip
   Sometimes leased from the phone company

   \begin{center}
   \begin{tabular}{|l|l|} 
   \hline
     Service to ask for & Bandwidth you get \\
     \hline
     ISDN    & 64 Kbps  \\
     T1      & 1.544 Mbps \\
     T3      & 44.736 Mbps \\
     STS-1   & 51.840 Mbps \\
     STS-3   & 155.250 Mbps \\
     STS-12  & 622.080 Mbps \\
     STS-24  & 1.244160 Gbps \\
     STS-48  & 2.488320 Gbps \\
   \hline
   \end{tabular}
   \end{center}
\end{slide}