The **LMC213A-MMST-R2** is a high-performance **Fiber Media Converter** manufactured by Black Box. It is designed to bridge the gap between copper-based Ethernet networks and fiber-optic infrastructure. --- ### ## Technical Specifications Below are the primary electronic and physical characteristics of the device: | Component / Feature | Specification | | :--- | :--- | | **Copper Port** | 1 x RJ-45 (10/100/1000 Mbps) | | **Fiber Port** | 1 x Multi-mode ST (1000 Mbps) | | **Max Distance** | Up to 550 meters (1804 feet) | | **Wavelength** | 850 nm | | **Input Power** | 5 VDC, 1A (External power supply) | | **Operating Temp** | 0 to 50°C (32 to 122°F) | | **Standards** | IEEE 802.3, 802.3u, 802.3ab, 802.3z | --- ### ## Internal Electronic Functions The LMC213A-MMST-R2 utilizes several key electronic mechanisms to ensure reliable data transmission: 1. **Auto-Negotiation & MDI/MDI-X:** The copper port features internal logic to automatically detect the speed (10/100/1000 Mbps) and duplex mode of the connected device. The Auto MDI/MDI-X function eliminates the need for crossover cables. 2. **Link Propagation (LinkLoss/FEF):** The circuitry includes "Link Propagation" logic. If the fiber link fails, the converter will automatically "drop" the copper link. This notifies managed switches or routers of the failure immediately, rather than leaving the port active with no data flow. 3. **Signal Conversion (Phy Chipset):** The core of the unit is a Physical Layer (PHY) transceiver that converts electrical pulses from twisted-pair cabling into optical pulses for multi-mode fiber. 4. **LED Diagnostics:** The front panel contains diagnostic LEDs connected to the internal controller to monitor: * **PWR:** Power status. * **LNK/ACT:** Link established or data activity. * **FDX:** Full-duplex mode. --- ### ## Application Diagram The device is typically used in pairs or connected to a central fiber switch. ```text [PC/Server] <--(Cat5e/6)--> [LMC213A-MMST-R2] <--(Multi-mode Fiber)--> [Switch/Router] ``` ---