The **NB-RSEXT-2M** is a specific electronic accessory manufactured by APC (Schneider Electric). It is an **External Temperature/Humidity Probe Extension Cable** (2 meters) designed for use with NetBotz environmental monitoring systems. Below is a breakdown of its electronic components, specifications, and function. --- ### 1. Component Overview The NB-RSEXT-2M is a passive electronic interconnect. It is designed to extend the reach of NetBotz digital sensors (like the AP9335T or AP9335TH) to the rack or room environment being monitored. | Feature | Specification | | :--- | :--- | | **Cable Type** | Multi-conductor shielded cable | | **Length** | 2.0 Meters (approx. 6.5 feet) | | **Connector A** | 3.5mm Mini-Jack (Male) | | **Connector B** | 3.5mm Mini-Jack (Female) | | **Signal Type** | Analog/Digital (Low Voltage) | --- ### 2. Internal Electronic Structure While the cable appears simple, it is engineered to maintain signal integrity for sensitive environmental data: * **Conductors:** Typically consists of three or four high-purity copper strands to carry VCC (Power), Ground, and Data (often 1-Wire or I2C protocols used by the sensors). * **Shielding:** To prevent Electromagnetic Interference (EMI) from high-voltage power cables in server racks, the cable includes internal shielding (braided or foil). * **Insulation:** PVC or LSZH (Low Smoke Zero Halogen) outer jacket, rated for data center environments. * **Gold-Plated Contacts:** The 3.5mm connectors often feature gold plating to prevent oxidation and ensure a low-resistance connection over long periods. --- ### 3. Electronic Compatibility This part is specifically used within the **NetBotz** ecosystem. It acts as a bridge between: 1. **The Base Station:** NetBotz 250, 450, 570, or Rack Monitor 750. 2. **The Sensor:** Temperature probes or Humidity/Temperature combination sensors. #### Technical Pinout Logic (Typical) | Pin | Function | Description | | :--- | :--- | :--- | | **Tip** | Data | Digital signal path for sensor readings | | **Ring** | VCC | 3.3V or 5V Power supply for the sensor chip | | **Sleeve** | Ground | Common return path | --- ### 4. Usage Constraints Because this is a specialized electronic extension, certain electronic limitations apply: * **Daisy Chaining:** APC generally recommends not exceeding a total length of 15–30 meters (depending on the sensor type) due to voltage drop and signal degradation across the thin copper traces. * **Environmental Rating:** It is designed for indoor climate-controlled environments; it is not chemically resistant or waterproof. ---