using the 1.2 website as a basis for the new 1.3 website

[rrdtool-all.git] / website / gallery / alex-01.wml

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-#include "$(ROOT)/.wml/template.inc" section=gallery subsection=alex-01
-
-<H1>Billing Cross Check</H1>
-
-<P>by <A HREF="mailto:alex@ergens.op.Het.Net">Alex van den Bogaerdt</A></P>
-
-<P>
-Our internet provider does usage based billing.  Part of the bandwidth
-is at a fixed price, the remaining bandwidth is subject to UBB.</P>
-
-<P>The UBB works as follows:  every sample period the current bandwidth is
-calculated.  When it is above the UBB rate, the excess is used to build
-an average over a month.  This average is used to calculate the bill.</P>
-
-<P>I do trust the provider however I do not necessarily trust their billing
-system.  Therefore I need a way to check the bill.</P>
-
-<P>Normal usage would be to graph from the 1st of the previous month until
-the 1st of the current month.  RRDtool does all the calculations, using
-CDEF statements.  I use bash to collect the prices from a database, then
-start the RRDtool script with those variables filled in.</P>
-
-<P>The data that I used to create the image has been altered to protect
-our privacy and the providers pricing policy (meaning: its bogus data).
-It does show however how it works.  If I create the graph using correct
-values for start and end times, the only difference should be caused by
-rounding and by different polling times.</P>
-
-<P><IMG SRC="alex-01.png"></P>
-
-<P>If you are interested in the script generating this, get it
-<A HREF="alex-01.bash">here</A>.</P>