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Binh.

LDP/guide/docbook/Linux-Networking/Media-Types.xml

@@ -16,6 +16,7 @@ maximum distance at which they can be used.
 
 <varlistentry><term>Unshielded Twisted Pair (UTP)</term>
 <listitem><para>
+
 <para>
 UTP is the most common type of network cable in use today. UTP consits of
 one or more pairs of insulated copper wires. The wires are twisted together
@@ -47,16 +48,17 @@ the bandwidth they support are summarized below.
 <para>
 <screen>	
 Category	Maximum Data and Transfer Rate	Description
-3		10 Mbps				Least expensive network cable, commonly used
+3		10 Mbps				Least expensive network cable
 4		16 Mbps				Medium quality; rarely used
-5		100 Mbps			Highest quality
-
+5		100 Mbps			Highest quality; highly prevelant
 > Start Binh
 5		1000Mbps		        Highest Quality
 > End Binh
 </screen>
 </para>
 
+</para></listitem></varlistentry>
+
 <varlistentry><term>Shielded Twisted Pair (STP)</term>
 <listitem><para>
 <para>
@@ -74,6 +76,8 @@ bandwidth, potentially as high as 500 Mbps.
 
 </para></listitem></varlistentry>
 
+</varlistentry>
+
 <varlistentry><term>Coaxial</term>
 <listitem><para>
 				
@@ -111,7 +115,9 @@ RG-62		93 ohms		ARCnet
 </screen>
 </para>
 
-Fiber Optic</term>
+</para></listitem></varlistentry>
+
+<varlistentry><term>Fiber Optic</term>
 <listitem><para>
 <para>
 A fiber optic cable consists of a thin glass or clear plastic fiber encased
@@ -125,8 +131,11 @@ cable is much more expensive than multimode cable. The advantages of fiber are
 high bandwidth (up to 2 Gbps (gigabits per second) and extremely low attenuation.
 Fiber cable can reach distances ranging from severak miles for multimode cable
 to hundreds of miles for single-mode cable.
+</para>
+</para></listitem></varlistentry>
 
-Infrared</term>
+<varlistentry><term>Infrared</term>
+<listitem><para>
 
 <para>
 Wireless infrared networking systems are modulated beams of infrared light to
@@ -137,19 +146,26 @@ vulnerable to obstructions (such as weather conditions) and bright light, and
 suseceptible to eavesdropping. There are two types of infrared networks:
 </para>
 
+<para>
 - Point-to-point networks use a focused beam, usually generated by a laser.
 They are less vulnerable to dispersion and can theorectically be used for long
 distance networking, although the need for precise alignment between receiever
 and transmitter and the vulneraibility to obstructions often makes it
 impractical. Bandwidth can be as high as 16 Mbps.
+</para>
 
+<para>
 - Broadcast networks use a less focused beam that disperses rapidly. These
 systems can transmit to multiple workstations ar once, but are much more
 vulnerable to dispersion, limiting their useful distance and bandwidth.
 Bandwidth is usually no more than 1 Mbps.
+</para>
 
-Radio
+</para></listitem></varlistentry>
 
+<varlistentry><term>Radio</term>
+<listitem><para>
+			
 <para>
 The most common type of wireless networks use radio waves. Tdaio-based networks
 have a reasonably high bandwidth, but are very sensitve to EMI and eavesdropping.
@@ -157,20 +173,25 @@ Also, many radio frequencies are regulated by the FCC and are unavailable for us
 without a license. There are three types of radio links:
 </para>
 
+<para>
 - Low power single frequency
 
 This type of system is best suited for small ares, such as within a building. It
 uses a lower-power transmitter on a single radio frequency. The available range is
 approximately 30 meters. This is the lowest-cost method of radio networking.
 Bandwidth may be as high as 10 Mbps.
+</para>
 
+<para>
 - High power single frequency
 
 This system is also uses a single frequency, but at a higher power. This allows
 for a much greater range, often covering an entire metropolitan area. Bandwidth is
 typically 10 Mbps. The greater range makes this type of network the most vulnerable
 to eavesdropping.
+</para>
 
+<para>
 - Spread-spectrum
 
 These systems use multiple frequencies, primarily to avoid eavesdropping. This
@@ -179,8 +200,12 @@ several different frequencies, while frequency hopping transmission change
 frequencies at scheduled intervals known to both ends. Both of these are
 significantly less vulnerable less vulnerable to EMI and snooping than other
 radio networks.
+</para>
 
-Microwave
+</para></listitem></varlistentry>
+
+<varlistentry><term>Microwave</term>
+<listitem><para>
 
 <para>
 Another type of wireless network communications uses microwaves, which are
@@ -189,19 +214,23 @@ vulnerable to interference and snooping, and can provide greater bandwidth.
 Two common types of microwave networks are in use:
 </para>
 
+<para>
 - Terrestial
 
 This method provides for line-of-sight communication, usually across a short
 distance. Bandwidth can be as high as 10 Mbps. Microwaves are still vulnerable
 to interference and eavesropping, although not as much as conventional radio
 waves.
+</para>
 
+<para>
 - Satellite
 
 This method relays microwave transmissions via a satellite, allowing for a
 nearly global range. The bandwidth can be as high as 10 Mbps, but the satellite
 relays cause delays that may impair real-time communication. These systems are
 more expensive than wireless communication.
+</para>
 
 <para>
 Please note that any information after this point in this section is largely
@@ -210,7 +239,12 @@ being economically more viable and also technologically superior) by
 those that have been outlined above.
 </para>
 
+</para></listitem></varlistentry>
+<!--
 - Serial NULL Modem cable
 - Parallel port cable (PLIP cable)
+-->
+
+</variablelist></para>
 
 </sect1>