docs/INTERCONNECT.md
Interconnect
Activated with aicam-interconnect. Spec delta: openspec/changes/add-camera-interconnect/.
Plant
[body cam] --CSI/GMSL--> Thor ISP --> NVENC H.265 --> NVMe ring --> 5/10/25GbE --> NAS
[body /i ] --PL pins or barrel--> UART/USB on Thor ----------------+--> JSONL sidecar
[sat 1] --PoE H.265--> PoE switch -- |
[sat 1 /i] --/i port--> Lockit+ or ONVIF meta --> switch -- |
[sat 2] --PoE H.265--> PoE switch ---+--> Thor remux / NVDEC ----+--> NAS
PoE switch is a kit item (Thor has no PoE)Lens metadata is a second stream, 1:1 with picture, not inside the HEVC. See LENS.md.
Decisions
| Fork | Call |
|---|---|
| Fabric | Hybrid: body on CSI/GMSL, satellites on PoE |
| Record | H.265. RAW is CSI-into-SoC only |
| Uplink | HEVC bring-up fits 5GbE. 10/25GbE is NAS/headroom |
| QSFP28 | Independent MGBE lanes, not aggregated 100G |
| USB-C | Not the satellite trunk (short, shared, no PoE) |
| Encode split | Body = Thor NVENC. Sats = camera H.265, Thor remux to NAS (no re-encode). T4000 HQ is 2× 4Kp30 |
| Time | PTP on sats; GMSL/HW on body. SMPTE genlock unproven |
| GMSL2 count | Honest 4× 4K30 RAW (8× 2-lane/1080p) on one JCB022. 20 is HSB. Sats scale on PoE H.265, not more FAKRA. |
| Sat SoC | RV1126B (RV1126 ok). Turret = encode mule; module = product (UART for /i + 1D ToF). |
| Lidar | 1D ToF on every sat sidecar. One Ethernet 3D lidar on the rig, not per camera. |
| Lens | Cooke /i class from every camera, sidecar JSONL |
Why HEVC
DS-11945-001 v1.4: T4000 1× NVENC, HEVC HQ 2× 4Kp30 / 1× 4Kp60. Hardware encode exists. One 4K30 HEVC is ~80 Mbps; three is ~0.24 Gbps. Gigabit PoE + 5GbE is the plant. Uncompressed 4K30 10-bit 4:2:2 is ~5 Gbps and is not the satellite budget.
Still open
- Exact PoE switch SKU (at vs bt)
- PTP vs camera TC vs slate clock (product, not model)
- Hero uncompressed sat — exception, not v1