{
 "title": "Video on 75 Ω coaxial jacks (VID-75)",
 "connector": {
  "designation": "RCA, BNC, or SMA jack, insulated from the panel (recommended)",
  "types": [
   "RCA",
   "BNC",
   "SMA"
  ],
  "part_class": "Any catalog RCA, BNC, or SMA jack that meets the clause",
  "clause": "7.4"
 },
 "terminal_map": {
  "center": {
   "function": "video",
   "net": "VIDEO_IN",
   "alt_net": "VIDEO_OUT"
  },
  "shell": {
   "function": "0 V",
   "net": "GND"
  }
 },
 "cable": {
  "impedance_ohm": 75,
  "plugs": [
   "RCA",
   "BNC",
   "SMA"
  ],
  "rule": "straight",
  "mapping": "Center pin to center pin, shell to shell at both ends"
 },
 "electrical": {
  "line_ohm": 75,
  "coupling": "AC on buffered distribution outputs is permitted when documented",
  "signal": "The video reference: black burst, or bi-level or tri-level video sync, of the selected clause 7.3 format",
  "input_termination_ohm": 75,
  "input_termination_note": "A VID-REF-IN presents 75 Ω to 0 V at the jack, unless the manual documents equivalent termination elsewhere.",
  "module_ports": [
   {
    "id": "COAX-IN",
    "label": "Terminated input",
    "direction": "in",
    "connector": "RCA, BNC, or SMA",
    "termination_ohm": 75,
    "kind": "eis",
    "clause": "7.4",
    "notes": "75 Ω to 0 V at the jack; a module's VID-REF-IN."
   },
   {
    "id": "COAX-OUT",
    "label": "Back-terminated output",
    "direction": "out",
    "connector": "RCA, BNC, or SMA",
    "back_termination_ohm": 75,
    "buffer_gain": 2,
    "kind": "eis",
    "clause": "7.4",
    "notes": "75 Ω series source, driven at twice the line level so that the terminated line sees the line level; a module's VID-REF-OUT or a distributor's PASSTHRU."
   },
   {
    "id": "COAX-PASSTHRU",
    "label": "Buffered pass-through",
    "direction": "out",
    "connector": "RCA, BNC, or SMA",
    "back_termination_ohm": 75,
    "buffer_gain": 2,
    "kind": "eis",
    "clause": "7.4",
    "notes": "A COAX-OUT driven from the reference at REF-IN, one COAX-IN load; a module's REF-PASSTHRU, marked PASSTHRU. Not a reference the module generates."
   },
   {
    "id": "COAX-LOOPTHRU",
    "label": "Loop-through pair",
    "direction": "in",
    "connector": "RCA, BNC, or SMA",
    "termination_ohm": 75,
    "kind": "eis",
    "clause": "7.4",
    "notes": "Two bridged jacks on one line with a termination switch: 75 Ω to 0 V across the line when TERM is on, no load when off; a module's REF-LOOPTHRU form of REF-IN."
   }
  ]
 },
 "distribution": {
  "rule": "One source, a VID-REF-OUT or an external reference at a distributor's VID-REF-IN, feeds each tree; each VID-REF-PASSTHRU or VID-REF-OUT drives one COAX-IN load. An output is not split passively.",
  "topology": "star"
 }
}