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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZSKSKLWZAAPMIEDLYKMF6Q7MWEIT2BFG/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ZSKSKLWZAAPMIEDLYKMF6Q7MWEIT2BFG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4BFSA2WATCZTKUKYZ4S3MDL2HLESSOBE/?format=api",
    "sender": {
        "address": "salo (a) saloits.com",
        "mailman_id": "251bbafb182a489fa8df89f48ea472e0",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/251bbafb182a489fa8df89f48ea472e0/emails/?format=api"
    },
    "sender_name": "Timothy J. Salo",
    "subject": "[amsat-bb] Re: BBsat Call for ideas",
    "date": "2008-11-30T22:32:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ANFQMODVRV5KWN2OF3OLI2QSGSKQTU66/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VG2DDLSKBJFUD46TE7S67AOAH5TK7CS3/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/THQMN2C4TY6R7UAXDFFNHRYY6UM4EOKG/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Greg D. wrote:\n> Ah, but how does one know that a time slot is not being used?\n> With many stations on the ground, there is a good chance that\n> multiple stations will pick the same \"empty\" slot to be theirs,\n> and we're back to collisions.\n\nFor good performance, some sort of media-access control (MAC)\nprotocol is required.  Time-slotted protocols have a lot to\nbe said for them, although some have suggested using a CDMA\nprotocol.  You could create a system that assigns time slots\nto active ground stations.  But, if these stations are generating\nvery bursty traffic, like voice, a lot of the uplink bandwidth\nmay be wasted.  In general, I think this is what I call a \"hard\nproblem\" (i.e., we don't know how to solve it [yet], and\nperhaps nobody else does either).\n\n> So, this is what I was talking about when I suggested, as\n> essentially you do, to work on a prototype of the ACP messaging\n> system that is being proposed for Eagle.\n\nI think this is a great idea.\n\nUnfortunately, as far as I can tell, all development work on\nthe Eagle and the ACP ceased several months ago.  The\nMicrowave Engineering Project (MEP) is or might become, in\nsome vague sense, a terrestrial variant of the ACP.\n\n   <http://www.delmarnorth.com/microwave/>\n\nI am hopeful that at least some of the work on the MEP\nwill be applicable to the ACP.\n\n> There are two significant technical challenges that I see,\n\nActually. I think there are a quite a few technical challenges\nand issues...\n\n> and the protocol used to facilitate fair and resilient access\n> to the satellite by all the ground stations it overflies is one.\n> ... I haven't checked, but has the Eagle team published their\n> protocol for doing this?  ...\n\nThe team developing the ACP ground station made pretty much\neverything they wrote freely available online.  [What a\nconcept!}  Unfortunately, they didn't get all that far before\nwork ceased.  See the ACP ground station Web site:\n\n   <http://www.delmarnorth.com/namaste/>\n\n> The other challenge is the modulation system ...\n   ^^^^^^^^^\n    Another\n\nYou might look at these two documents:\n\n<http://www.delmarnorth.com/microwave/requirements/Microwave_Link_Discussion.pdf>\n\n<http://www.delmarnorth.com/microwave/requirements/Microwave_Link_Analysis.pdf>\n\n-tjs\n\n",
    "attachments": []
}