The part number **76021-R285** refers to a high-density fiber optic adapter panel, specifically a **MPO-to-LC 12-Port Module**, manufactured by **CommScope** (often branded under the SYSTIMAX or TeraSPEED lines). While it is not a "circuit" component like a resistor or transistor, it is a critical passive electronic infrastructure component used in telecommunications and data centers. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | CommScope | | **Fiber Type** | Singlemode (G.657.A1) | | **Adapter Type** | LC (Front) to MPO (Rear) | | **Total Fiber Count** | 12 Fibers | | **Module Color** | Blue (Standard for Singlemode) | | **Insertion Loss** | 0.60 dB (Standard) | | **Polarity** | Method B (Enhanced) | --- ### 2. Functional Components The module serves as a bridge between high-density backbone cabling and individual networking equipment. #### A. Front Interface: LC Adapters * **Design:** 6 LC Duplex ports (totaling 12 fiber connections). * **Purpose:** These connect to standard fiber patch cords which then plug into SFP/SFP+ transceivers on switches or routers. #### B. Rear Interface: MPO Connector * **Design:** 1 MPO male/female connector. * **Purpose:** This accepts a 12-fiber MPO trunk cable. It allows for "plug-and-play" installation, eliminating the need for manual splicing in the field. #### C. Internal Breakout * Inside the plastic housing, there is a pre-terminated "fan-out" assembly. This assembly routes the 12 fibers from the single MPO port to the specific LC ports with high precision. --- ### 3. Application Use Cases 1. **Data Centers:** Used in "Top of Rack" or "End of Row" patching to manage high volumes of fiber in a small footprint. 2. **High-Speed Migration:** Enables a smooth transition from 10G (LC-based) to 40G/100G (MPO-based) network architectures. 3. **Enterprise Networks:** Provides a professional organized termination point in telecommunications rooms. --- ### 4. Installation Example To use this part in a system, the typical connectivity chain looks like this: `Switch` → `LC Patch Cord` → **[76021-R285 Module]** → `MPO Trunk Cable` → **[76021-R285 Module]** → `LC Patch Cord` → `Server` ---