Abstract
- The rack's front panel has a pairing (key) button beside an infrared LED. A press opens a pairing window (for example 30 s): the rack repeats a blast of about one second, about once a second, until the window times out or the button is pressed again. The web interface's and the control application's Pair buttons do the same. The rack never blasts outside a window. Because the pack sends nothing back, the rack shows "pairing", never "paired".
- The blast carries one link record: {channel, key fingerprint, salt, mix id}, about 12 bytes, and nothing else. The mix id is the stable 6-bit id of the mix (1-63, 0 = none) used in the rack's in-band labels, never a position, a name, a profile or a list.
- Which mix and which carrier: the mix selected on the rack's idle screen when Pair is pressed. The blast carries that mix's id and the channel of the one carrier that carries it now. A per-radio Pair (pairing a pack to one radio from the web interface) sends that radio's channel with mix id 0, and the pack then opens its own mix picker.
- The signalling is IrDA SIR at 115.2 kbaud (19.2 or 38.4 kbaud as fallbacks): one pulse of 3/16 of a bit time per 0 bit, no carrier, at 850-900 nm. The pack's receiver is receive-only; the pack has no infrared transmitter.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "One-way infrared pairing of a wireless audio receiver with a mix selected at the transmitter: a link record of channel, key fingerprint, salt and one stable mix id, sent as IrDA SIR from a pairing window opened on the transmitter's front panel, applied once by the receiver as its user's pick, each pairing replacing the last", Technical Disclosure Commons, (October 20, 2026)
https://www.tdcommons.org/dpubs_series/12320