Printable reference · P11F03
Audio: contacts and port roles
Count conductive sections on a disconnected plug, then establish the exact device role and wiring convention. Do not turn an exterior match into a wiring instruction.
Reference revision 2 · Assessed 2026-10-22. AI-assisted source reference; no independent review or hardware validation.
What do the visible rings and the device manual tell you separately?
| Clue or question | Supported distinction | Sources |
|---|---|---|
| TRS | Tip, ring and sleeve are three conductive sections. Socket solder/switch terminals are a different object. | S022 |
| TRRS | Four exterior conductors do not select CTIA versus OMTP microphone/ground assignment. | S844 S527 |
| CTIA / OMTP | The Android accessory mechanical table distinguishes the microphone and ground order. Use the named standard and view, not a universal headset assumption. | S844 |
| TOSLINK / Mini-TOSLINK | Both are optical forms. Mini-TOSLINK uses a 3.5 mm form that can resemble an analog connection. | S845 |
| Exact device role | A jack may have a specific input/output or headset restriction. The cited Focusrite case is a named-device limit. | S528 |
Check the complete task
- Record whether the photographed object is a plug, receptacle or termination side. Count conducting sections, not black insulating bands alone.
- Find the headset and device model specifications, audio role and contact convention. Use a documented adapter mapping if one is required.
- For optical audio, confirm the exact port optical role and format. A 3.5 mm-shaped opening alone is insufficient.
Text and conceptual comparisons only. No specimen photographs, contact-position diagrams, measured geometry or actual-size templates.
Keep an evidence note
- Headset / cable model
- Device model + jack role
- Named convention / exact adapter mapping
- Unresolved contact or optical-format evidence
Sources and exact scope
- S022 · Neutrik · NTP3RC miniature phone plug
Product identification · Recorded inspection 2026-10-01. 3.5 mm, 3-pole phone plug physical example.
- S844 · Android Open Source Project / Google · 3.5mm headset: Accessory specification
Mechanical table: four-conductor3.5mm plug, CTIA LRGM and OMTP LRMG; Reference headset test circuits introductory paragraph states MIC/GND exchange. · Recorded inspection 2026-10-21. The two ordered conductor schemes exchange microphone and ground while retaining the same nominal four-conductor plug form. Android accessory requirements only; not a list of supported devices, universal headset compatibility, switch-button compatibility or jack solder-lug layout. Diagram image files were not separately inspected; prose and mechanical table support these claims.
- S527 · Switchcraft · Switchcraft 35RASMT8CHNTRX switched TRRS jack
Configuration: four conductors, horizontal PC/surface mount, jack; Electrical: TRRS (Tip/Ring Switch). · Recorded inspection 2026-10-11. Named four-conductor jack and switching description only; no CTIA/OMTP assignment or terminal-count inference. Named four-conductor jack and switching description only; no CTIA/OMTP assignment or terminal-count inference. Raw source files are not bundled; linked observation and locator retained.
- S528 · Focusrite · Scarlett Solo 4th Gen: headphone and line-output roles
Headphone Output and Speaker Outputs sections; page update 16-Jul-2026. · Recorded inspection 2026-10-11. Named fourth-generation Solo only. Headphone versus balanced line-output role and TS/TRRS headphone warning; not universal device support. New scope on an already catalogued URL, not a new unique document. Named fourth-generation Solo only. Headphone versus balanced line-output role and TS/TRRS headphone warning; not universal device support. New scope on an already catalogued URL, not a new unique document. Raw source files are not bundled; linked observation and locator retained.
- S845 · CLIFF Electronic Components · TOSLINK Optical Audio Data Cables
Opening optical/light transmission description; TOSLINK to Mini-TOSLINK3.5mm lead sets; Mini-TOSLINK optical jack plug; FM65215/FM65220/FM65225 and FM65010 adapter listings. · Recorded inspection 2026-10-21. The manufacturer explicitly describes the rectangular and3.5mm mini forms as optical. No analog-to-optical conversion or universal audio-format ceiling follows. Product-family optical identification only. The3.5mm similarity warning is editorial caution, not measured user confusion. No dimensional tolerances or source photos were imported.
Inherited scoped research is reused; this sheet does not claim every source was freshly reopened. No manufacturer figures, manuals or logos are redistributed.