The **RUSB2AC2MB** is a specific model of a USB 2.0 cable, typically manufactured by StarTech.com. It is a **USB-A to Micro-B** cable, measuring 2 meters in length. Below is a detailed breakdown of its electronic components, specifications, and construction. --- ### 1. Technical Specifications | Feature | Specification | | :--- | :--- | | **Connector A** | USB Type-A (4-pin) Male | | **Connector B** | USB Micro-B (5-pin) Male | | **Standard** | USB 2.0 (High-Speed) | | **Data Transfer Rate** | Up to 480 Mbps | | **Cable Length** | 2 meters (6.6 feet) | | **Wire Gauge** | 24/30 AWG (Power/Data) | | **Jacket Material** | PVC (Polyvinyl Chloride) | --- ### 2. Internal Electronic Construction The cable consists of four main copper conductors wrapped in protective layers to ensure signal integrity and power delivery. #### A. Wire Gauge (AWG) This cable uses a dual-gauge design to optimize performance: * **28/30 AWG Data Lines:** Thinner wires used for the twisted pair that carries data (D+ and D-). * **24 AWG Power Lines:** Thicker wires used for power ($V_{BUS}$) and Ground. The lower gauge (thicker wire) reduces electrical resistance, allowing for better charging efficiency over a 2-meter distance compared to cheaper 28 AWG power cables. #### B. The Pinout Mapping | Pin | Name | Color | Function | | :--- | :--- | :--- | :--- | | 1 | $V_{BUS}$ | Red | +5V Power | | 2 | D- | White | Data Negative | | 3 | D+ | Green | Data Positive | | 4 | ID | N/A | Not connected (Micro-B standard) | | 5 | GND | Black | Ground | --- ### 3. Shielding and Signal Integrity To prevent **EMI (Electromagnetic Interference)** and **RFI (Radio Frequency Interference)**, the RUSB2AC2MB typically employs a multi-layered shielding approach: 1. **Aluminum-Mylar Foil:** Wrapped around the internal wires to block high-frequency noise. 2. **Braid Shielding:** A tinned copper braid that provides structural strength and additional grounding against low-frequency interference. 3. **Twisted Pair Geometry:** The data wires (Green/White) are twisted together to cancel out electromagnetic interference between the leads (crosstalk). --- ### 4. Physical Durability Features * **Molded Strain Relief:** The area where the cable meets the connector is molded with PVC to prevent the internal copper wires from snapping due to repeated bending. * **Nickel-Plated Connectors:** Provides corrosion resistance and ensures a stable electrical connection over many plug/unplug cycles. ---