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# Link Speed – Maximum speed per session
- URL: https://kudithipudi.org/link-speed-maximum-speed-per-session/
- Published: 2004-01-21T03:39:28.000Z
- Updated: 2004-01-21T03:39:28.000Z
- Description: I work at a teleport and most of our business is related to providing Internet service to ISPs in South Asia. One of the most frequent...
- Author: admin
- Tags: Networking, Technology, Uncategorized, #wp, #wp-post, #Import 2026-08-23 02:32

I work at a teleport and most of our business is related to providing Internet service to ISPs in [South Asia](http://en.wikipedia.org/wiki/South%5FAsia?ref=kudithipudi.org). One of the most frequent complaints that our help desk gets is “My link is slow, you guys are not providing us the complete speed”. Usually it is a case of the customer not understanding the finesse of [TCP/IP](http://en.wikipedia.org/wiki/TCP/IP?ref=kudithipudi.org). I came across [this](http://www.atlantateleport.com/Services/TCP%5FIP%5FVia%5FSatellite/tcp%5Fip%5Fvia%5Fsatellite.htm?ref=kudithipudi.org) article by Adam Grow III. He uses the following formula to calculate the maximum possible speed **per** session on a link.  

**Throughput = 8\*(TCPS/PropDelay)**

Where  
**Throughput** is measured in Kilobits per seconds (Kbps)  
**TCPS** \= Size of the TCP/IP stack in byte (Windows default is 8192)  
**PropDelay** \= propogation delay in seconds

Using the above formula, for a [geostationary](http://en2.wikipedia.org/wiki/Geostationary%5Forbit?ref=kudithipudi.org) satellite (where the propogation delay is \~540ms), the throughput is \~120Kbps. So even if the client has a 1Mb link and he just has one session, he can only use a fraction of the link. Only multiple sessions can saturate the link.