Hello
Maybe it would be useful to confirm we are talking GEO here and if that is true, the following from RFC 2488 maybe useful:
"The propagation time for a radio signal to travel twice that distance (corresponding to a ground station directly below the satellite) is 239.6 milliseconds (ms) [Mar78]. For ground stations at the edge of the view area of the satellite, the distance traveled is 2 x 41,756 km for a total propagation delay of 279.0 ms [Mar78]. These delays are for one ground station-to-satellite-to-ground station route (or "hop"). Therefore, the propagation delay for a message and the corresponding reply (one round-trip time or RTT) could be at least 558 ms. The RTT is not based solely on satellite propagation time. The RTT will be increased by other factors in the network, such as the transmission time and propagation time of other links in the network path and queueing delay in gateways."
So if the RTT (or even 1 hop) is 220ms this is not a GEO satellite link, nevermind full duplex or not.
Andrew Pether, M.Eng. ([email protected])
EMS Technologies, Space & Technology Group
21025 TRANS CANADA HIGHWAY
STE-ANNE-DE-BELLEVUE, QUEBEC
CANADA, H9X 3R2
>>> Dusan Statelov <[email protected]> 05/17 11:13 am >>>
Hello:
We are investigating reasons of poor TCP/ip performance over satellite.
We expect to get single TCP/ip performance of Windows size/RTT but in a
fact windows size does not influence performance at all.
We are working ni Windows NT platform.
In a LAN we get 180 kbyte/s the same system over sat falls to 25 kbyte/s
RTT is 220 ms windows size set to 64 kbyte.
I would appreciate your response and assistance.
-- Best regardsDusan Statelov Managing Director Main Data,s.r.o. mailto:[email protected]
Tel: +421 7 54789 586 Fax: +421 7 54789 585 GSM: +421 905 606 027 http://www.maindata.sk
This archive was generated by hypermail 2b29 : Fri May 18 2001 - 09:01:34 EDT