)]}'
{
  "commit": "888da5f48030e45ce14f43a2bf7be07ec79b60d4",
  "tree": "2c7617d471c6f7fac2b69911933e6ab801e18c93",
  "parents": [
    "e3f03f9236c25c3270aa3807ce5dcc315395ee83"
  ],
  "author": {
    "name": "Dennis Bland",
    "email": "dennis@dbperformance.com",
    "time": "Wed Apr 20 20:56:38 2022 -0600"
  },
  "committer": {
    "name": "Seth Forshee",
    "email": "sforshee@kernel.org",
    "time": "Sun May 08 15:18:39 2022 -0500"
  },
  "message": "Regulatory update for 6 GHz operation in United States (US)\n\nWith the 6 GHz band (U-NII-5, U-NII-6, U-NII-7, U-NII-8) in USA, the FCC\nintroduces the concept of a fixed PSD (Power Spectral Density) for all\nsupported 6 GHz channel widths for LPI (Low Power Indoor) environments.\nWider channel widths have a higher noise floor, therefore specifying a\nfixed PSD allows wider channels to operate at a higher EIRP to maintain\nthe same S/N ratio as smaller channel widths.\n\nWhile the 6 GHz specification also allows a \"Standard\" power mode with\nhigher EIRP and PSD limits, these devices are also required to employ\nAFC (Automatic Frequency Coordination) which normally requires GNSS.\nCurrently there is no way to specify different EIRP and PSD levels for\nAPC and non-APC devices.  Therefore, only LPI mode is considered here.\n\nLPI requires non-client (AP) devices to have a maximum PSD of 5 dBm/MHz\nand a maximum EIRP of 30 dBm.  LPI requires client (STA) devices to have\na maximum PSD of -1 dBm/MHz.  The maximum channel width is 320 MHz.\n\nThe following equation is used to calculate the EIRP from the PSD and\nchannel width:\n\nEIRP \u003d PSD + 10*log(channel width in MHz)\n\nUsing the maximum PSD values of 5 and -1 for APs and STAs respectively,\nthe EIRP in dBm for a given channel width can be calculated:\n\nChannel Width (MHz)     AP            STA\n------------------------------------------------\n20                      18            12\n40                      21            15\n80                      24            18\n160                     27            21\n320                     31 (max 30)   25 (max 24)\n\nFor channel widths up to 160 MHz, the maximum PSD is the limiting factor.\nFor the 320 MHz channel width, the maximum EIRP is the limiting factor.\n\nUnfortunately, because there is currently no mechanism to specify\ndifferent power levels for AP and STA modes, and for different channel\nwidths, the smallest value has to be selected, which is 12 dBm.  This\nwill likely cause connectivity problems with larger channel widths until\nthese additional parameters can be added.\n\n6 GHz operation on oil platforms, vehicles, boats, trains, and drones is\nprohibited except on commercial aircraft above 10,000 feet altitude.\nAn IR (Initiate Radiation) restriction is mentioned in the 6 GHz\nspecification.\n\nSigned-off-by: Dennis Bland \u003cdennis@dbperformance.com\u003e\nSigned-off-by: Seth Forshee \u003csforshee@kernel.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "062ad8a73538f1923e92af8f24be9e120de49447",
      "old_mode": 33188,
      "old_path": "db.txt",
      "new_id": "fcdc74aad49ef5bcedf24a4176b3fa86f37f6d34",
      "new_mode": 33188,
      "new_path": "db.txt"
    }
  ]
}