Thanks Steve and you are right from the perspective of a Full duplex 10 MBps LAN connection; though, I typically see 10 MBps connections setup as half duplex which is the case in my scenario.
As I understand it, the T1 provides symmetric communications, meaning that any one of the 24 channels in the circuit can be sending or receiving, but not both, at any given point in time. So, if we were only using 50% of the T1 to receive data, it is possible for the other 50% of available bandwidth to be utilized for sending data. If we are using 100% of the bandwidth for sending data there are no pathways left for receiving. So with that said, I'm still left uncertain how the combined total was over 100%. -----Original Message----- From: Steve Shipway [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 11, 2004 4:41 PM To: Soden, David Subject: RE: [mrtg] Utilization graph uncertainty If you have a 10Mb interface (for example), this means 10Mb inbound and 10Mb outbound. Therefore you can get up to 100% inbound and 100% outbound simultaneously -- provided you have full duplex, of course, which most things are nowadays. Your link's inbound and outbound counts are independent, ie, you don't add the percentages together to get a total usage figure. Better would be to average them. This is why you can have 97% incoming and 50% outgoing at the same time, because the incoming traffic does not prevent outgoing traffic for using the outgoing line. If you want an analagy, think of a road. A normal netowrk link is a 2-way road -- no matter how much traffic goes north, it doesn't prevent traffic from simultaneously travelling south. The exception to the rule is a half-duplex ethernet link. This is like a one-way road that changes direction -- some commuter tunnels have lanes like this that are inbound in the morning and outbound in the evening. So, a lot of northern traffic prevents the southern traffic from having much time to flow. Hope this helps, Steve --- Steve Shipway: ITSS, University of Auckland Email: [EMAIL PROTECTED] Web: http://www.steveshipway.org/ ** We can only discover new oceans when we have the ** ** courage to lose sight of the shore. ** -- Unsubscribe mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/mrtg FAQ http://faq.mrtg.org Homepage http://www.mrtg.org WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
