Internal Universal Serial Bus (USB) wiring links your workstation's front-chassis I/O panels directly to the logic boards. We detail both legacy USB 2.0 (9-pin layout) and modern high-speed USB 3.0 (20-pin dual-channel layout) configurations below. [1, 2, 3]
Legacy USB 2.0 Internal Header (Dual Port Layout) [1]
- Pin 1: 🔴 +5V Power (VCC) - Port 1
- Pin 3: ⚪ Data Minus (D-) - Port 1
- Pin 5: 🟢 Data Plus (D+) - Port 1
- Pin 7: ⚫ Ground - Port 1
- Pin 9: ❌ Dummy Pin / Key (No wire connected)
- Pin 2: 🔴 +5V Power (VCC) - Port 2
- Pin 4: ⚪ Data Minus (D-) - Port 2
- Pin 6: 🟢 Data Plus (D+) - Port 2
- Pin 8: ⚫ Ground - Port 2
- Pin 10: ❌ NC / Not Connected [1, 2, 3, 4, 5]
Unlike USB 2.0, USB 3.0 requires additional dedicated differential shielded pairs to achieve full 5 Gbps transmission rates without signal degradation. [1, 2, 3]
- Pin 1: 🔴 VBUS (+5V Power)
- Pin 2: 🔵 SSRX- (SuperSpeed Receive -)
- Pin 3: 🔵 SSRX+ (SuperSpeed Receive +)
- Pin 4: ⚫ GND (Ground)
- Pin 5: 💛 SSTX- (SuperSpeed Transmit -)
- Pin 6: 💛 SSTX+ (SuperSpeed Transmit +)
- Pin 7: ⚫ GND (Ground)
- Pin 8: ⚪ D- (Legacy Data -)
- Pin 9: 🟢 D+ (Legacy Data +)
- Pin 10: ❌ ID / NC (Not Connected)
- Pins 11-19: Mirror the exact same signal lines in reverse sequence to supply the second physical USB front port, anchored by a Pin 20 Key structure. [1, 2, 3, 4, 5]