Media gallery
Media gallery
Media gallery
Media gallery
Media gallery
Media gallery
Media gallery

MikroTik CRS305-1G-4S+IN Desktop Switch with 4x 10GbE SFP+ Ports & 1x Gigabit Ethernet Port

Brand MikroTik

Model Number CRS305-1G-4S

EpicRise Warranty 1 Year

Product Highlights

• 4x SFP+ 10GbE ports deliver 41Gbps non-blocking throughput and 61Mpps forwarding rate for high-performance network infrastructure

• Dual boot capability lets you switch between RouterOS for Layer 3 routing features or SwOS for simplified switch-specific operations

• Fanless passive cooling in compact metallic case operates silently from -40°C to 70°C for noise-sensitive enterprise environments

• Dual DC jack inputs plus PoE-IN support (802.3af/at) provide power redundancy to maintain uptime during power fluctuations

• Energy-efficient design consumes max 10W without attachments while delivering 82Gbps switching capacity for cost-effective operations

Overview
Specifications
FAQ
User Guides
Reviews

The MikroTik CRS305-1G-4S+IN is a compact five-port desktop switch engineered for enterprise networks requiring high-speed fiber connectivity without the noise and footprint of traditional rack switches. It bridges Gigabit management access with 10 Gigabit SFP+ uplinks, enabling IT teams to deploy fiber-based network segments in offices, labs, or distributed locations where fanless operation and desk-friendly form factors are essential.

Built on the 98DX3236 switch chip with 512MB RAM and dual-core ARM architecture, this device handles 41Gbps of non-blocking throughput with forwarding rates up to 61Mpps. The dual boot system allows network administrators to run full RouterOS for VLAN, routing, and firewall capabilities, or switch to lightweight SwOS when only basic switching functions are needed. Power redundancy through two DC jacks and PoE-IN support ensures the switch stays operational even during single power source failures.

Best For

The CRS305-1G-4S+IN serves enterprise IT departments needing silent, high-performance switching in environments where rack space is unavailable or noise must be minimized:

- Office network aggregation: Connect multiple Gigabit switches via 10GbE fiber uplinks to centralize traffic from different floors or departments without installing noisy rack equipment in shared workspaces

- Lab and testing environments: Provide researchers and QA teams with 10Gbps connectivity for server testing, data transfer, or virtualization workloads in open office settings where fan noise disrupts work

- Small data center edge switching: Deploy at remote sites or edge locations requiring fiber connectivity to core infrastructure while maintaining Layer 3 routing capabilities through RouterOS

- IP camera backbone networks: Aggregate high-resolution surveillance feeds from multiple PoE switches over fiber links, using the management port for switch configuration without affecting camera traffic

- Point-to-point fiber links: Establish dedicated 10GbE connections between buildings or network segments using SFP+ modules for distances up to 10km with single-mode fiber

Key Features

- Four SFP+ cages support 10GbE fiber modules (1.25Gbit SFP modules also compatible) for flexible short-range multimode or long-distance single-mode deployment

- 82Gbps switching capacity with 61Mpps forwarding rate tested per RFC2544 standards ensures wire-speed performance even under sustained heavy workloads

- Dual operating system selection between RouterOS (full Layer 3 features including BGP, OSPF, firewall) and SwOS (streamlined switch-only interface) without additional licensing

- Passive cooling eliminates mechanical failure points and maintains silent operation across -40°C to 70°C tested ambient temperature range

- Three power input options (2x DC jack 12-57V, 1x PoE-IN 802.3af/at) provide redundancy options for mission-critical deployments

- CPU temperature monitoring enables proactive thermal management in enclosed installations or high ambient temperature environments

- 141 x 115 x 28mm footprint and 499g weight allow desktop placement or wall mounting without consuming rack space

- RouterOS License Level 5 included with lifetime software updates for minimum 5 years from purchase date

Quick Specs

Model	CRS305-1G-4S+IN
Ethernet Ports	1x 10/100/1000 Mbps
SFP+ Ports	4x 10Gbps (SFP+ modules not included)
Switch Chip	98DX3236
CPU	Dual-core ARM 32-bit @ 800MHz
RAM	512 MB
Storage	16 MB Flash
Switching Capacity	82 Gbps
Throughput	41 Gbps non-blocking
Forwarding Rate	61 Mpps
Operating Systems	RouterOS v6/v7 or SwOS v2.9+
License Level	RouterOS License 5
Power Input	2x DC jack (12-57V), 1x PoE-IN (802.3af/at, 12-57V)
Max Power Draw	10W (18W with attachments)
Cooling	Passive (fanless)
Operating Temperature	-40°C to 70°C (tested)
Dimensions	141 x 115 x 28 mm
Weight	499 g
MTBF	~200,000 hours at 25°C

What's Included

- MikroTik CRS305-1G-4S+IN switch

- 24V 0.8A power adapter

Product Details
Power Source	DC-powered, Battery-powered

What network environments is the CRS305-1G-4S+IN best suited for?

This switch excels in office or lab environments requiring 10GbE fiber uplinks without rack mounting or fan noise. It connects distributed Gigabit switches via fiber, provides desktop-accessible high-speed connectivity for testing equipment, or serves as edge aggregation in small deployments. The fanless design and compact size make it suitable for shared workspaces where traditional rack switches are impractical.

How does the CRS305-1G-4S+IN compare to other MikroTik CRS3xx series switches?

The CRS305 offers desktop form factor and fanless operation, distinguishing it from rack-mount models like the CRS309 or CRS317. It sacrifices port density and PoE output capabilities for silent operation and space efficiency. Choose this model when you need four 10GbE uplinks in noise-sensitive environments, versus higher port count rack switches for data center deployments or models with PoE output for powering downstream devices.

Is the $149 price point justified for a four-port SFP+ switch?

The CRS305 delivers enterprise-grade 41Gbps throughput and full RouterOS Layer 3 capabilities at a fraction of comparable managed switch costs. The dual boot system eliminates separate licensing fees, and the 10W power draw reduces long-term operating costs. For deployments needing fiber aggregation with routing features in desktop form factor, this represents strong value versus basic unmanaged switches lacking software flexibility or larger managed switches requiring rack infrastructure.

What SFP+ modules and fiber types work with this switch?

The CRS305 supports both 10GbE SFP+ modules and 1.25Gbit SFP modules in all four cages. Use multimode fiber modules with OM3/OM4 cable for distances up to 300m, or single-mode modules with OS2 fiber for runs up to 10km. MikroTik maintains a compatibility matrix for specific module part numbers. The switch accepts third-party modules but MikroTik-branded transceivers ensure tested compatibility.

What's the difference between running RouterOS versus SwOS on this switch?

RouterOS provides full Layer 3 routing (BGP, OSPF), firewall, VPN, and advanced VLAN features for complex network configurations. SwOS offers a simplified web interface focused solely on switching functions like basic VLANs and port management. You can switch between operating systems through the boot loader without additional licenses. RouterOS suits networks needing routing or security policies, while SwOS simplifies deployments requiring only traffic forwarding.

How do I configure power redundancy on the CRS305-1G-4S+IN?

Connect power to both DC jacks (12-57V each) or use one DC jack plus PoE-IN (802.3af/at) on the Gigabit Ethernet port. The switch automatically draws from available sources. If one input fails, operation continues uninterrupted on the remaining source. Total power budget is 10W without attachments or 18W maximum with all SFP+ modules populated. PoE input requires a 802.3af/at compliant injector or switch on the management port.

Can this switch operate in enclosed spaces or high-temperature environments?

The fanless passive cooling design allows operation in fully enclosed cabinets or installations where airflow is restricted. MikroTik tested this unit from -40°C to 70°C ambient temperature. The built-in CPU temperature monitor lets you track thermal conditions through RouterOS or SwOS. For sustained operation above 50°C, ensure adequate spacing around the metal case for heat dissipation and consider external ventilation in extreme conditions.

Does the CRS305 support stacking or VLAN segmentation across SFP+ ports?

The switch supports VLAN tagging (802.1Q) on all ports through RouterOS or SwOS for network segmentation. It does not support proprietary stacking protocols for multi-switch management as a single unit. For spanning VLANs across multiple switches, configure trunk ports on SFP+ interfaces and use standard 802.1Q tagging. RouterOS enables inter-VLAN routing if Layer 3 forwarding between segments is required.