MikroTik CRS328-4C-20S-4S+RM 20x SFP 4x SFP+ 4x Combo Dual Boot Rackmount Switch
The MikroTik CRS328-4C-20S-4S+RM is a feature-rich 1U rackmount managed switch offering 28 independent ports in a highly flexible configuration: twenty 1GbE SFP cages, four 10GbE SFP+ cages, and four combo ports that accept either a Gigabit Ethernet RJ45 connection or an SFP module. Powered by the 98DX3236 switching chip with a dual-core 800 MHz ARM CPU and 512 MB of RAM, it delivers non-blocking Layer 2 wire-speed switching. Like other CRS-series devices, it supports dual boot between RouterOS and SwitchOS, allowing operators to choose between full Layer 3 routing capability or a streamlined managed switch interface. Dual redundant power supplies provide high-availability operation.
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The MikroTik CRS328-4C-20S-4S+RM (Cloud Router Switch) is a versatile and port-rich 1U rackmount switch that combines SFP, SFP+, and combo port connectivity in a single unit. Its combination of 20 standard SFP ports, 4 SFP+ 10G uplink ports, and 4 flexible combo ports makes it particularly well suited to mixed-media environments where both copper and fibre connections need to be accommodated alongside high-speed uplinks.
Port Configuration & Flexibility
The switch provides 28 independent ports in total. The twenty SFP cages accept standard 1GbE SFP modules — optical or copper — for fibre or RJ45 connections as required. The four SFP+ cages support 10GbE for high-speed uplink or inter-switch connections via fibre, DAC, or compatible SFP+ modules. The four combo ports are a standout feature: each can be used either as a standard Gigabit Ethernet RJ45 port or as an SFP port, providing maximum flexibility for deployment scenarios where the connection type may vary or change over time.
Switching Performance
The 98DX3236 chip delivers non-blocking Layer 2 wire-speed switching across all ports simultaneously. Measured switching performance shows non-blocking Layer 2 throughput of up to 63,167 Mbps at 1518-byte packets, with a full non-blocking Layer 1 capacity of 128,000 Mbps bidirectional. RouterOS-based bridging fast-path delivers up to 1,266.6 Mbps throughput at 1518-byte packets, with routing fast-path at the same level — confirming capable Layer 3 forwarding performance in addition to wire-speed Layer 2 switching.
Dual Operating System — RouterOS & SwitchOS
The CRS328-4C-20S-4S+RM supports dual boot between RouterOS and SwitchOS. RouterOS provides the full MikroTik feature set including Layer 3 routing, VLAN management, firewall, QoS, MPLS, VPN, and advanced switching features, manageable via WinBox, WebFig, or CLI. SwitchOS offers a simplified, switch-oriented management interface for operators who prefer traditional managed switch workflows. Both operating systems are pre-installed and licensed at no additional cost. A dedicated mode button on the unit provides convenient OS switching.
Power & Cooling
The unit features two PSU slots with failover functionality, accepting 100–240 V AC at 50–60 Hz, providing power redundancy for high-availability deployments. Maximum power consumption is 43 W. Two fans handle active cooling. On-board CPU temperature and voltage monitors support health management.
Build & Form Factor
The CRS328-4C-20S-4S+RM occupies 1U of rack space at 443 × 194 × 44 mm. It is designed to operate between -20°C and 60°C, with an MTBF of approximately 200,000 hours at 25°C. An RJ45 serial console port provides out-of-band management access. The package includes a K-54 kit, rackmount ears, and two IEC power cords.
Use Cases
The CRS328-4C-20S-4S+RM is well suited for ISP aggregation and distribution layers, enterprise or campus network distribution switching, data centre access-layer switching with 10G uplinks, environments requiring mixed copper and fibre SFP connectivity, and any deployment where a high-port-density managed switch with dual-boot OS flexibility and redundant power is required.
Key Specifications at a Glance
- Product Code: CRS328-4C-20S-4S+RM
- SFP Ports: 20x 1GbE
- SFP+ Ports: 4x 10GbE
- Combo Ports: 4x (Gigabit Ethernet RJ45 or SFP)
- Total Independent Ports: 28
- Switch/CPU Chip: 98DX3236, dual-core 800 MHz, ARM 32-bit
- RAM: 512 MB
- Storage: 16 MB FLASH
- Operating System: RouterOS / SwitchOS (dual boot, pre-installed and licensed)
- Non-Blocking Layer 2 Throughput: Up to 63,167 Mbps (1518-byte)
- Non-Blocking Layer 1 Capacity: 128,000 Mbps (bidirectional)
- Serial Console: RJ45
- Mode Button: Yes
- AC Power Input: 100–240 V, 50–60 Hz
- PSU Slots: 2 (redundant with failover)
- Max Power Consumption: 43 W
- Cooling: 2 fans
- Form Factor: 1U rackmount
- Dimensions: 443 × 194 × 44 mm
- Operating Temperature: -20°C to 60°C
- MTBF: ~200,000 hours at 25°C
- Certifications: CE, EAC, RoHS
- Included: K-54 kit, rackmount ears, 2x IEC cords
- Product code
- CRS328-4C-20S-4S+RM
- Architecture
- ARM 32bit
- CPU core count
- 1
- CPU nominal frequency
- 800 MHz
- Operating System
- RouterOS / SwitchOS
- Size of RAM
- 512 MB
- Storage size
- 16 MB
- Storage type
- FLASH
- Tested ambient temperature
- -20 + 60 degrees C
- Max Power consumption
- 43
- Max power consumption without attachments
- 43W
- Dimensions
- 443 x 200 x 44 mm
- Number of AC inputs
- 2
- AC input range
- 100-240
- Ethernet Combo ports
- 4
- SFP ports
- 20
- CPU temperature monitor
- Yes
- Voltage Monitor
- Yes
General information
All students who attend the Training can receive a free L4 license from MikroTik. Training should be at least three days long.
Students are allowed to take the certification test ONLY upon the attendance of individual training course, in the class, under the supervision of a MikroTik Certified Training Partner.
Each certification test consists of a pre-defined % of random questions (multiple choice and true/false) from specific question categories. Items also have a difficulty parameter. MTCNA test is generated from more straightforward questions, Advanced tests – from more difficult questions.
Only one attempt is allowed. The test must be finished within one hour. The passing grade is set to 60%. There are 25 questions in the exam.
Certificate numbers and RouterOS L4 licenses are assigned automatically by MikroTik. Students can see their certificates and generate license keys once logged into the account server. Printed documents from MikroTik cost USD 30 per piece. Shipping is not included.
Remote training sessions and certification exams are not allowed.
MikroTik Certification Test without prior attendance of particular MikroTik Training Session is not allowed.
Wireless Netware offers every participant a free RouterBOARD hAP-ac-lite.
The price includes class attendance, course materials, coffee breaks and lunch, "Only for local Training." The amount does not cover travel and accommodation expenses.
Please bring (very important): Laptop, power extension strip (10ft./3m) with five sockets, one long Ethernet cable (16ft./5m+) and several short Ethernet cables.
Cost: Early bird price for the course is $850. It is valid 15 days before the scheduled session, referring to the MikroTik Training website. The price will be $1050 after the early bird date. The price includes class attendance, course materials, coffee breaks and lunch," Only for local Training." The amount does not cover travel and accommodation expenses. Seating is limited to only four students. The seat is reserved and guaranteed just after the payment is received in full amount.
Certificates will only be valid for three years.
Become a consultant: It's simple if you have MTCNA (score 75%+) and at least one valid MikroTik Engineer level certificate (MTCRE, MTCWE, MTCTCE, MTCUME or MEDICINE) with score 75%+, apply by email with your mikrotik.com account name and fields of expertise and MikroTik will add you to the list. To stay on the consultant list, you will have to have valid certificates, participate in the MikroTik Forum and attend the ...M.U.M. events in your country conducting RouterOS case studies or workshops for the rest of the attendees.
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