Description
The MikroTik CRS328-4C-20S-4S+RM is a 28-port independent Cloud Router switch with a flexible combo group, built for large organizations and ISPs that need high port density with fiber and copper flexibility. It’s designed to adapt to a wide variety of network setups within a single 1U rackmount unit.
At its core, the switch offers 20 SFP ports supporting speeds up to 1GbE, alongside 4 SFP+ ports capable of handling up to 10GbE speeds. This combination allows businesses to connect a large number of fiber or copper devices while still having high-speed uplinks available for demanding backbone connectivity.
The switch also includes 4 versatile combo ports, letting users choose between RJ45 and SFP connections for each one. These ports can even be software selected through scripting, so administrators can decide exactly which combo ports stay active if all eight cables happen to be plugged in.
With a non-blocking throughput of 64 Gbps, a switching capacity of 128 Gbps, and a forwarding rate of 95.2 Mpps, the MikroTik CRS328-4C-20S-4S+RM handles demanding data center and enterprise traffic smoothly and reliably.
Reliability is another area where this switch performs well. It includes dual 100-240V power supplies with failover functionality, meaning a single power failure won’t cause unexpected downtime for critical network infrastructure.
Management is made simple through an RJ45 console port for debugging, along with a customizable mode button that can be set to execute any RouterOS command, giving administrators quick access to routine tasks.
The switch also supports Dual Boot functionality, letting administrators choose between MikroTik’s feature-packed RouterOS for full Layer 3 routing capabilities, or the simpler, switch-focused SwOS depending on their deployment needs.
Advanced Layer 2 features round out the package, including IEEE 802.1Q VLAN support for up to 4K simultaneous VLANs, port isolation, broadcast storm control, and STP/RSTP/MSTP for managing redundant network paths.
Built with temperature-based fan control, the switch balances cooling efficiency with quiet operation, adjusting automatically based on real-time thermal conditions inside the unit.
Whether the goal is building flexible fiber infrastructure for a growing ISP or supporting high-capacity enterprise switching, this device offers a dependable balance of port flexibility, speed, and redundancy.
Overall, the MikroTik CRS328-4C-20S-4S+RM stands out as a practical choice for organizations that want maximum port flexibility at scale, all backed by the reliability of RouterOS.
MikroTik CRS328-4C-20S-4S+RM Specifications
| Specification | Details |
|---|---|
| Product Code | CRS328-4C-20S-4S+RM |
| Architecture | ARM 32bit |
| CPU | 98DX3236 |
| CPU Core Count | 2 |
| CPU Nominal Frequency | 800 MHz |
| Switch Chip Model | 98DX3236 |
| Dimensions | 443 × 194 × 44 mm |
| RouterOS License | 5 |
| Operating System | RouterOS / SwitchOS |
| RAM | 512 MB |
| Storage Size | 16 MB |
| Storage Type | FLASH |
| MTBF | Approximately 200,000 hours at 25°C |
| Tested Ambient Temperature | -20°C to 60°C |
MikroTik CRS328-4C-20S-4S+RM Power
| Specification | Details |
|---|---|
| AC Inputs | 2 |
| AC Input Range | 100–240V |
| PSU Slots | 2 |
| Frequency | 50–60 Hz |
| Maximum Power Consumption | 43 W |
| Cooling Type | 2 Fans |
MikroTik CRS328-4C-20S-4S+RM Ethernet & Fiber
| Specification | Details |
|---|---|
| Ethernet Combo Ports | 4 |
| SFP Ports | 20 |
| SFP+ Ports | 4 |
MikroTik CRS328-4C-20S-4S+RM Peripherals & Monitoring
| Specification | Details |
|---|---|
| Serial Console Port | RJ45 |
| CPU Temperature Monitor | Yes |
| Voltage Monitor | Yes |
| Mode Button | Yes |
MikroTik CRS328-4C-20S-4S+RM Certification & Included Parts
| Specification | Details |
|---|---|
| Certification | CE, EAC, ROHS |
| Included Parts | K-54 Kit |
| Rackmount Ears | Included |
| Power Cable | 2 × IEC Cords |
MikroTik CRS328-4C-20S-4S+RM Switching Performance
| Mode | Configuration | 1518 Byte | 512 Byte | 64 Byte |
|---|---|---|---|---|
| Switching | Non-blocking Layer 2 Throughput | 5,201.6 kpps / 63,167.8 Mbps | 15,037.6 kpps / 61,594.0 Mbps | 95,238.1 kpps / 48,761.9 Mbps |
| Switching | Non-blocking Layer 2 Capacity | 5,201.6 kpps / 126,335.5 Mbps | 15,037.6 kpps / 123,188.0 Mbps | 95,238.1 kpps / 97,523.8 Mbps |
| Switching | Non-blocking Layer 1 Throughput | 5,201.6 kpps / 64,000 Mbps | 15,037.6 kpps / 64,000 Mbps | 95,238.1 kpps / 64,000 Mbps |
| Switching | Non-blocking Layer 1 Capacity | 5,201.6 kpps / 128,000 Mbps | 15,037.6 kpps / 128,000 Mbps | 95,238.1 kpps / 128,000 Mbps |
MikroTik CRS328-4C-20S-4S+RM Ethernet Test Results
| Mode | Configuration | 1518 Byte | 512 Byte | 64 Byte |
|---|---|---|---|---|
| Bridging | None (Fast Path) | 104.3 kpps / 1266.6 Mbps | 273.5 kpps / 1120.3 Mbps | 449 kpps / 229.9 Mbps |
| Bridging | 25 Bridge Filter Rules | 104 kpps / 1263.0 Mbps | 104.6 kpps / 428.4 Mbps | 104.5 kpps / 53.5 Mbps |
| Routing | None (Fast Path) | 104.3 kpps / 1266.6 Mbps | 273.9 kpps / 1121.9 Mbps | 343.5 kpps / 175.9 Mbps |
| Routing | 25 Simple Queues | 104.3 kpps / 1266.6 Mbps | 136.9 kpps / 560.7 Mbps | 137.4 kpps / 70.3 Mbps |
| Routing | 25 IP Filter Rules | 64.8 kpps / 786.9 Mbps | 65.9 kpps / 269.9 Mbps | 65.8 kpps / 33.7 Mbps |
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