SAT Bandwidth Usage

Hi,

I wanted to know more on the SAT BW usage in iMonitor. What does the term IP downstream/ IP Upstream, SAT Upstream & Downstream really mean?

I have seen many times the SAT BW to be higher than IP BW, but sometimes the reverse too.

I guess SAT downstream or upstream should be higher than the IP downstream or Upstream as it consists of the Data+ signalling packets.

Please explain me more on these.

Have a good day.

With Regards,

Sushil.

Sushil, that is the basic understanding that everyone has but it is a little more complicated than that.

You mentioned that sometimes the IP Traffic is higher and at others, the SAT Traffic  is higher. There is a good explanation for this.

Lets first take a quick look at exactly where the traffic is being measured at. The IP Traffic Stats are collected at the entrance to the Protocol Processor or the Upstream/Internet side. The SAT Traffic Stats are collected at the output of the Protocol Processor or Tunnel side.

To explain why there is a difference and the fact that they sometimes take turns as to which one is higher. We would normally think that SAT Traffic STATS would be higher because as mentioned earlier it incorporates the IP data plus overhead/signaling packets however, in the event of a large TCP download the IP Traffic STATs are often higher due to the TCP ACKs that are sent back and forth from the Protocol Processor and the internet end point.

On the Satellite side, iDirect's TCP acceleration eliminates a large majority of these TCP ACKs thus reducing traffic flow across the satellite. In this instance the TCP ACKs on the Internet interface would be greater than the overhead/signaling packets on the satellite side.

Hope this helps.

Hi,

Yes this is really complecated and I would like to understand properly as it is not yet clear. I tried reading iMonitor guide but did not understand. If there is any clear explanation than it will be useful.

Thanks in advance.

Hi everybody,
happy to join this discussion,I am very interested by this subject. In fact I was analyzing traffic on an infiniti network, runing software version 7.0.2.0.
I have built long term bandwith report for both SAT and Ip stats. I am a bit confused as the difference between the two stats is >7Mbps in the Downstream, the SAT stats show 7Mbps more than the Ip stats, and the difference seems to be Broadcast traffic. Does anybody know what is the Bcast traffic between the PP and the remotes related to?My report is based on the all the remotes in the network.
the network has a 12mbps downstream Inforate, 0.793 FEC, but the SAT Stats for all the remotes shows peaks of 19Mbps and Bcast trafic of 7Mbps.
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