🚀 go-pugleaf

> 
> Hi,
> 
> I have some statistics I have been gathering from one of my packet
> switch nodes within my company's private X.25 network.  I have been
> monitoring the incoming and outgoing bit/sec data rates between
> Richardson Texas and Stockholm Sweden.
> 
> We have a full duplex communications link capable of 112
> kilobits/sec of data throughput.  We have recently gotten into a
> quarrel over what the utilization of the link is.  
> 
> Here is the scenario.  My statistics tell me that I have the
> following:
> 
> 40,000 bits/sec input data rate
> 60,000 bits/sec output data rate
> 
> I think that the utilization of our line during this time (expressed
> as a percentage) is ((40,000 + 60,000)/112000) * 100%
> 
> while some others here think that the utilization of our line
> (expressed as a percentage) is gotten by taking the higher of the
> two data rate figures and dividing that by the maximum data rate, or
> (60,000/112000)*100%.
> 
> Does anyone have any input on which is the right way to express the
> utilization of our link?  Any input would be appreciated.
> 
> Blake Holman
> Ericsson Network Systems, Inc.
> Richardson, Texas
> (214) 997-6784
> 


Hello Blake,

Since serial lines are full duplex dividing by the bandwidth of the link
will just not work. Hence greater of either input OR output bytes, bits, or
packets per second be taken and divided by the BW of the link.

One of our Engineers had written an article on this and a formula for
average utilization was :

 average utilization = [(bytes-input OR bytes-output) * 8] / ifSpeed

   The OR above denotes a case where you should take the larger
of the input and output values to divide by the bandwidth (ifSpeed) to
determine the true link utilization.

Hope this helps.


Regards

Pasha Quadri
cisco Cust.Engg