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    <title>Tom Moertel's Weblog: Tag networking</title>
    <link>http://blog.moertel.com/articles/tag/networking?tag=networking</link>
    <language>en-us</language>
    <ttl>40</ttl>
    <description>Quality rants on programming theory and stuff geeks like</description>
    <item>
      <title>Verizon FiOS fiber-optic Internet service: a first look</title>
      <description>&lt;p&gt;Recently I had Verizon&amp;#8217;s fiber-optic service &amp;#8220;FiOS&amp;#8221; installed
at my home.  The installation process took about a half day
and involved placing the following boxes around my house:&lt;/p&gt;


	&lt;ul&gt;
	&lt;li&gt;optical network terminal (ONT, installed outside of house)&lt;/li&gt;
		&lt;li&gt;battery backup unit (BBU, installed in basement)&lt;/li&gt;
		&lt;li&gt;power adapter (plugged into household electrical outlet)&lt;/li&gt;
	&lt;/ul&gt;


	&lt;p&gt;The &lt;span class="caps"&gt;ONT&lt;/span&gt; was installed  next to my old &lt;span class="caps"&gt;POTS&lt;/span&gt;
junction box:&lt;/p&gt;


	&lt;p&gt;&lt;img src="http://community.moertel.com/~thor/pix/20051115/img_0820.jpg" title="new optical network terminal next to old POTS junction box" alt="new optical network terminal next to old POTS junction box" /&gt;&lt;/p&gt;


	&lt;p&gt;The &lt;span class="caps"&gt;ONT&lt;/span&gt; acts like a miniature central office.  To my house it provides
four &lt;span class="caps"&gt;POTS&lt;/span&gt; lines for voice service and one 10/100 Mbps Ethernet port for
data service.  The &lt;span class="caps"&gt;ONT&lt;/span&gt; accepts a single fiber-optic cable that
connects all of these services back to Verizon&amp;#8217;s central office.&lt;/p&gt;


	&lt;p&gt;As part of the installation process, Verizon moved my &lt;span class="caps"&gt;POTS&lt;/span&gt; lines from
copper over to the &lt;span class="caps"&gt;ONT&lt;/span&gt;&amp;#8217;s &lt;span class="caps"&gt;POTS&lt;/span&gt; interfaces.  Verizon wanted to remove my
copper-based service altogether, but I forbade them from doing so
because I have non-Verizon business lines that I want to keep on
copper, which competitive carriers can use to offer me service.
(Verizon is not required to share its fiber cables with competitive
carriers.)&lt;/p&gt;


	&lt;p&gt;If you look closely at the &lt;span class="caps"&gt;ONT&lt;/span&gt;, you&amp;#8217;ll see that it also is capable of
handling video service:&lt;/p&gt;


	&lt;p&gt;&lt;img src="http://community.moertel.com/~thor/pix/20051115/mini-co.jpg" title="the ONT is a miniature central office" alt="the ONT is a miniature central office" /&gt;&lt;/p&gt;


	&lt;p&gt;(At present Pennsylvania&amp;#8217;s cable-franchise laws prevent Verizon
from offering video service, but I&amp;#8217;m sure Verizon&amp;#8217;s lobbyists are
working to change that situation.)&lt;/p&gt;


	&lt;p&gt;Unlike copper wires, fiber-optic cables do not carry power.  The &lt;span class="caps"&gt;ONT&lt;/span&gt;,
therefore, must be powered from my home&amp;#8217;s electrical service.  If the
power goes out, the battery backup unit (BBU) will supply power for
the &lt;span class="caps"&gt;ONT&lt;/span&gt;&amp;#8217;s voice services for about four hours.&lt;/p&gt;


	&lt;p&gt;VoIP users beware: When the household power fails, the &lt;span class="caps"&gt;ONT&lt;/span&gt;&amp;#8217;s data
services will be dropped immediately in order to conserve the &lt;span class="caps"&gt;BBU&lt;/span&gt;&amp;#8217;s
battery.  This seems pretty lame to me, but Verizon confirmed this
behavior when I called them to ask about it.  If you need data service
during a power failure, make sure your &lt;span class="caps"&gt;ONT&lt;/span&gt; is powered via a &lt;span class="caps"&gt;UPS&lt;/span&gt;
under your control.&lt;/p&gt;


	&lt;p&gt;To provide data service to my house, the installer ran a &lt;span class="caps"&gt;CAT&lt;/span&gt;-5 cable
from the &lt;span class="caps"&gt;ONT&lt;/span&gt;&amp;#8217;s 10/100 Ethernet port into my house, where it plugs into
a D-Link 4-port &amp;#8220;Ethernet Broadband Router,&amp;#8221; provided by Verizon for
free.  Although the provided router has &lt;span class="caps"&gt;NAT&lt;/span&gt; and firewall features, I
placed a Linux-based firewall between it and the rest of my home
network as an added precaution.&lt;/p&gt;


	&lt;p&gt;I have been using the service for several days now, and here is my
verdict:&lt;/p&gt;


	&lt;p&gt;&lt;em&gt;It&amp;#8217;s just broadband.&lt;/em&gt;&lt;/p&gt;


	&lt;p&gt;Practically speaking, I can&amp;#8217;t tell any difference between FiOS and my
Adelphia cable-modem service.  I ordered 5-Mbps service from both
providers, and both services provide about 5 Mbps down, which is
faster than fast enough for me. The FiOS service has slightly lower latency &amp;#8211; I
can ping www.google.com in about 9 ms &amp;#8211; and that&amp;#8217;s a nice plus.&lt;/p&gt;


	&lt;p&gt;The big benefit of FiOS is competition: Verizon&amp;#8217;s price is about $10/month
less than Adelphia&amp;#8217;s.  When I called Adelphia to cancel my service,
their representative attempted to change my mind by offering me a
3-month promotional discount and trying to sell me extra television
channels.&lt;/p&gt;


	&lt;p&gt;I passed.&lt;/p&gt;</description>
      <pubDate>Tue, 15 Nov 2005 14:23:00 -0500</pubDate>
      <guid isPermaLink="false">urn:uuid:8c575ad62009c28696b7567c26839a5c</guid>
      <author>Tom Moertel</author>
      <link>http://blog.moertel.com/articles/2005/11/15/verizon-fios-fiber-optic-internet-service-a-first-look</link>
      <category>reviews</category>
      <category>hardware</category>
      <category>networking</category>
      <category>networking</category>
      <category>fios</category>
      <trackback:ping>http://blog.moertel.com/articles/trackback/15</trackback:ping>
    </item>
    <item>
      <title>Replacing the fan array in my HP ProCurve 4000M switch</title>
      <description>&lt;p style="float:right"&gt;&lt;a href="http://community.moertel.com/~thor/pix/20051111-procurve/"&gt;&lt;img src="http://community.moertel.com/~thor/pix/20051111-procurve/thumbnails/img_0835-wm.jpg" title="replacing the fans in a 4000m switch" alt="replacing the fans in a 4000m switch" /&gt;&lt;/a&gt;&lt;/p&gt;


	&lt;p&gt;The main network switch in my home office is an &lt;a href="ftp://ftp.hp.com/pub/networking/software/59676916.pdf"&gt;HP ProCurve
4000m&lt;/a&gt;, which 
has been running non-stop for over half a decade.  It is a great
switch, and even though it is getting old, it is still dependable.&lt;/p&gt;


	&lt;p&gt;A while ago I noticed that the 4000m&amp;#8217;s fault indicator was
lit.  So I logged into the switch and checked the log:  fan
1 was dead.  The switch has built-in redundancy (three fans),
and so I didn&amp;#8217;t worry about it, but I did call HP ProCurve
tech support.&lt;/p&gt;


	&lt;p&gt;The woman I spoke with was friendly and helpful.  I told her what was
wrong, and she said a new fan array would
be on my doorstep within 48 hours.  No charge.  (I guess the
ProCurve warranty really is worth something.)&lt;/p&gt;


	&lt;p&gt;Today, I installed the array.  This meant opening up the switch,
which is a fun thing to do.  If you are curious about what is inside
of a 4000m, &lt;a href="http://community.moertel.com/~thor/pix/20051111-procurve/"&gt;I took photos of the operation&lt;/a&gt;.&lt;/p&gt;


	&lt;p&gt;During the process, I recalled why I love old-style HP engineering:&lt;/p&gt;


	&lt;ul&gt;
	&lt;li&gt;The replacement parts came with clear instructions
  that showed me how to remove the old array and install the new one.
  They were easy to follow and didn&amp;#8217;t leave anything to guess.&lt;/li&gt;
		&lt;li&gt;The 4000m is solid &amp;#8211; inside and out.&lt;/li&gt;
		&lt;li&gt;The electrical components are top quality.&lt;/li&gt;
		&lt;li&gt;The industrial engineering is superb.  For example, all of the user-removable
  screws have non-stripping torx heads and are designed &lt;em&gt;not&lt;/em&gt; to fall
  out and get lost; instead they remain attached to the module or
  panel you are removing.  (See &lt;a href="http://community.moertel.com/~thor/pix/20051111-procurve/img_0835-wm.jpg"&gt;this photo of removed modules&lt;/a&gt;
  to see how the screws stay in place.)&lt;/li&gt;
	&lt;/ul&gt;


	&lt;p&gt;Everything about the process made me think, &lt;em&gt;wow, this is really well engineered&lt;/em&gt;.&lt;/p&gt;


	&lt;p&gt;The thing is, I know, as I sit here and watch the blinking LEDs on my
now-restored 4000m, that my next network switch will probably be a
Dell.&lt;/p&gt;


	&lt;p&gt;As much as I love the ProCurve engineering, the Dell price is
compelling.  Even if I expect the Dells to fail twice as often (and
the Dell warranties &lt;em&gt;are&lt;/em&gt; comparatively lame), I can buy twice as
many Dells and keep spares on the shelf &amp;#8211; and still save money
compared to the equivalent ProCurve equipment.&lt;/p&gt;


	&lt;p&gt;I find the situation somewhat sad.  I am an engineering guy to the
core.  So when &lt;em&gt;I&lt;/em&gt; go for the cheaper product because it is &lt;em&gt;so darn cheap&lt;/em&gt;,
I know that much of the market will do likewise.  That bodes ill
for HP.  Like HP&amp;#8217;s calculators, the ProCurves too may pass into
history.&lt;/p&gt;</description>
      <pubDate>Fri, 11 Nov 2005 21:42:00 -0500</pubDate>
      <guid isPermaLink="false">urn:uuid:e4dc96cdd46f60872cb5b6f4c3fc3151</guid>
      <author>Tom Moertel</author>
      <link>http://blog.moertel.com/articles/2005/11/11/replacing-the-fan-array-in-my-hp-procurve-4000m-switch</link>
      <category>photography</category>
      <category>hardware</category>
      <category>engineering</category>
      <category>hardware</category>
      <category>hp</category>
      <category>networking</category>
      <category>4000m</category>
      <category>engineering</category>
      <category>photos</category>
      <category>switch</category>
      <trackback:ping>http://blog.moertel.com/articles/trackback/14</trackback:ping>
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