The **CSS124P** refers to the **Cloud Smart Switch 124-24P-1S-RM** manufactured by MikroTik. It is a managed 24-port Gigabit Ethernet switch that provides Power over Ethernet (PoE) functionality. Below is a breakdown of its key electronic components and technical specifications. --- ## 1. Core Electronic Specifications The internal architecture is designed for Layer 2 switching with a focus on power distribution. | Component | Specification | | :--- | :--- | | **Switching Chip** | Marvell DX (Optimized for SwOS) | | **CPU** | Built-in management processor (ARM/MIPS based) | | **RAM** | 64 KB (Optimized for simplified switching operations) | | **Storage** | 2 MB Flash (Holds the SwOS firmware) | | **Operating System** | SwOS (SwitchOS) | --- ## 2. Power and PoE Components The "P" in the model name signifies its primary feature: **Power over Ethernet**. ### Power Input * **Dual Power Jacks:** It typically features two DC jacks for redundancy or different voltage requirements. * **Voltage Range:** Supports 18V to 57V DC input. ### PoE Output (Power Distribution) * **PoE Standards:** Passive PoE and 802.3af/at (Type 1 and Type 2). * **Output Per Port:** Max 600mA (at < 30V) or 450mA (at > 30V). * **Total Power Budget:** Depends on the external power supply used (Total limit usually around 600W with proper cooling/input). * **Auto-Sensing:** The electronic circuits detect if a connected device requires power to prevent damaging non-PoE hardware. --- ## 3. Physical Interface Parts The electronic board translates signals across 26 distinct ports: 1. **24x RJ45 Ports:** 10/100/1000 Gigabit Ethernet ports. Each port includes an integrated transformer (magnetics) for signal isolation. 2. **2x SFP Ports:** Small Form-factor Pluggable cages for fiber optic transceivers, providing high-speed uplink capabilities. 3. **LED Matrix:** Driven by a dedicated controller to show Link/Activity and PoE status for every port. --- ## 4. Protection Circuits To ensure industrial-grade reliability, the PCB includes several protection layers: * **ESD Protection:** Built-in protection against Electrostatic Discharge on Ethernet ports. * **Thermal Monitoring:** Sensors that trigger cooling or power throttling if the internal temperature exceeds safety limits. * **Current Limiting:** Integrated circuits (ICs) that shut down individual ports if a short circuit or over-current is detected. --- ## 5. Summary Table | Feature | Details | | :--- | :--- | | **Form Factor** | 1U Rackmount | | **Max Power Consumption** | ~18W (excluding PoE out) | | **Non-Blocking Throughput** | 26 Gbps | | **Switching Capacity** | 52 Gbps | | **Forwarding Rate** | 38.7 Mpps |