What is the significance of the delay x bandwidth product

Tiny Software Personal Firewall v1. Linksys Instant GigaDrive. Why encrypt your online traffic with VPN? Satellite Internet - What is it? Broadband Forums General Discussion Gallery. Console Gaming. Popular Is 5GHz Wireless better than 2. Cool Links SpeedGuide Teams. Registry Tweaks Broadband Tools. SG Ports Database Security. Default Passwords User Stories. Broadband Routers Wireless. Hardware User Reviews. An example could be a satellite connection.

These connections offer a high bandwidth but the delay is also quite high since you have to send your signal miles up to the satellite and another miles down to reach the receiver. You can expect a round trip time anywhere between about ms. The problem here is that when the sender sends some data, it has to be wait a very long time for an acknowledgment of the receiver before it can send the next data. The throughput of TCP is limited by the round trip time of the link and the window size.

Take a look at the image below:. Imagine we send some data from the host to the server, when this piece of data is on its way we have to wait a long time before it reaches the server and for the acknowledgment to come back. A lot of bandwidth is wasted.

This is what happens with a large window size:. The most optimal window size depends on the bandwidth and delay of the link, we call this the bandwidth delay product. We can calculate it with the following formula:. So our bandwidth delay product is bits. Are there any downsides to increasing the TCP window size?

Once you have calculated the bandwidth delay product, you should test if it works. A nice way to test this is by using iPerf.

This application allows you to generate TCP traffic with different window sizes. These two hosts are connected through a gigabit link so this is a high bandwidth low delay link. You can add this document to your study collection s Sign in Available only to authorized users. Description optional. Visible to Everyone. Just me. Add this document to saved. You can add this document to your saved list Sign in Available only to authorized users. Suggest us how to improve StudyLib For complaints, use another form.

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