OTG vs USB: Connection Modes for Phone Farms

Connection mode is a core RFQ field — it drives hub tier, cable kit, and stability profile. **USB-only:** - Control and data on USB tree to control PC - Simplest for small farms and lab benches - Bandwidth shared across nodes on same hub **OTG / Ethernet offload:** - Reduces USB congestion for large farms - Adds router/switch lines to BOM - Useful when many nodes push heavy traffic concurrently **Hybrid:** Some stacks USB for control, OTG for network path — layout documented on wiring diagram at quote. **Change mid-project:** Possible with spare hub and cable lines; may require re-burn-in after rewire. State current and target connection mode on RFQ so sales does not assume USB-only by default.