From: Per Selin Subject: Re: Update and questions Date: 02/09/2011 09:47:46 AM Anders, I don't think a larger memory on your side will help This is how I understand it: Continuously acquisition at 1kb/s will give 1*60*60*24 = 10.8MB/day Total memory in our RTU is approx 40 MB excl. EDAC, so this should work as buffer In average the ground station is visible 30 minutes/day The data rate is 100kb/s so max amount of data per day is 100*30*60 = 22MB Now to the problem: The link between our RTU and the modem is 38,4kb/s and available buffer in the modem is 500kB. Two alternatives are possible 1) Not using the modem buffer and directly send data when S-band is available. This will give 38.4*1800 = 8,64MB/day (probably lower because of SW interaction) 2) Using the buffer during 3 passages/day -> 1.5MB/day All calculations are based on raw data. Payload data will be reduced by overhead etc. The initial mission time is 30 days. After that, the Latvian payloads will take control and I don't know how much data we can download. To summarize this - We can provide you with a lot of data but maybe not continuously 1kb/s. We have to coordinate the data transfer with the other payloads Regards Per