mgsn-discussion Mailing List for Mercury Ground Station Network
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From: <ben...@id...> - 2004-05-25 10:42:21
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Dear Open Source developer I am doing a research project on "Fun and Software Development" in which I kindly invite you to participate. You will find the online survey under http://fasd.ethz.ch/qsf/. The questionnaire consists of 53 questions and you will need about 15 minutes to complete it. With the FASD project (Fun and Software Development) we want to define the motivational significance of fun when software developers decide to engage in Open Source projects. What is special about our research project is that a similar survey is planned with software developers in commercial firms. This procedure allows the immediate comparison between the involved individuals and the conditions of production of these two development models. Thus we hope to obtain substantial new insights to the phenomenon of Open Source Development. With many thanks for your participation, Benno Luthiger PS: The results of the survey will be published under http://www.isu.unizh.ch/fuehrung/blprojects/FASD/. We have set up the mailing list fa...@we... for this study. Please see http://fasd.ethz.ch/qsf/mailinglist_en.html for registration to this mailing list. _______________________________________________________________________ Benno Luthiger Swiss Federal Institute of Technology Zurich 8092 Zurich Mail: benno.luthiger(at)id.ethz.ch _______________________________________________________________________ |
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From: James C. <jw...@st...> - 2003-11-10 19:21:29
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Great questions... > What kind of functionality will these central servers provide? Initially, the will act as resource locators for the MGSN. Ground stations will register their services and users will be able to request GS services from them. We'll also use these servers to help manage user profiles. Users will login in to the MGSN servers, which in turn will login to GS's as needed. This will shield the ground stations from having to worry about every user. We've got a small description of this that I will post online. > Are these supposed to implement the registration and the VGS service? Exactly! Do you envision anything else? > What is the status of these services? Are you finished, or is there > somthing we could help with? We have not implemented any of this yet. So, yes, if you're willing, help would be great. I'm working on the GSML and service descriptions that the MGSN servers will implement. We also need to develop a web GUI, an access server for software agents to use the services, and the database backend. Does anything sound interesting to you? I hope to get a description out in the next couple weeks. --Jamie |
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From: Brun <br...@no...> - 2003-10-27 13:30:47
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> Also, I just received some CPU > hardware and we'll be setting up some of the initial MGSN central servers > here shortly. What kind of functionality will these central servers provide? Are these supposed to implement the registration and the VGS service? What is the status of these services? Are you finished, or is there somthing we could help with? sincerely group 03gr734 of Aalborg university |
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From: James C. <jw...@st...> - 2003-10-24 17:44:58
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> 1) What hardware does your TNC at Stanford consist of? > 2) Which specific tasks does the TNC perform? In the HAM world, the TNC (terminal node controller) traditionally performs (de)modulation, bit synchronization, frame sync, and packetization. TNC's tend to be fairly intelligent with small microprocessors embedded in them. They often have a specialized interface to allow you to configure their AX.25 packetization capabilties. Their is a group at the U of Wuerzburg that is also putting FEC (forward error correction into a TNC). We tend to operate our TNC's in KISS mode (KISS-Keep It Simple Stupid). TNC's in KISS mode do not perform many of the standard packetization functions. They pass the AX.25 packets on to the CPU that is connected to them so that the CPU can handle them. We connect our KISS TNC's to Linux boxes that have kernel support for AX.25. TNCs are dinosaurs and I expect them to be extinct soon. General purpose CPUs are replacing all of their functionality. For instance, a CPU running Linux with a sound card can perform all the functions of a standard TNC. We're combining these software radio/modem systems with virtual machines. Check out this paper: http://swig.stanford.edu/pub/publications/space/RCSGSOJCutlerMS.pdf. With this technology, we should be able to provide incredible multi mission support in ground stations. > 3) Is it sufficient to use the MX909 (GMSK Modem Data Pump), and a computer for > the AX25 coding? Yes it should. We'll need to figure out how to export an interface to your system through Mercury. We haven't labeled all the pipeline outputs yet. In our AX.25 world, we've been using a TNC export and KISS export. So, the default is that the GS exports KISS packets (with AX.25 packets encoded into them). Can we make your computer interface to the MX909 do the same thing? Other interfaces we'll be exporting include IP, IP over AX.25, etc. And actually, as we implement the virtual machines described above, the GS and Mercury will no longer have to worry about explicitly knowing about the interfaces. They will be handled by the VM. I hope this helps. Sorry for the late reply. We just finished building a ground station here and we're shipping it to Fairbanks, Alaska today! That should give us and the MGSN some good northern coverage. Can't wait to get your station up and running too! Also, I just received some CPU hardware and we'll be setting up some of the initial MGSN central servers here shortly. Hope all is well! Cheers! --Jamie |
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From: <jk...@ko...> - 2003-10-21 15:33:10
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Hello At our group (who are working with the Mercury System) at Aalborg university, we have dicussed the TNC component, and have come up with the following questions: 1) What hardware does your TNC at Stanford consist of? 2) Which specific tasks does the TNC perform? 3) Is it sufficient to use the MX909 (GMSK Modem Data Pump), and a computer for the AX25 coding? Jakob Krogh Larsen 03gr734 Aalborg Univerity |
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From: James C. <jw...@st...> - 2003-09-11 15:43:32
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Test. |
