MikroTik FiberBox Plus CRS305-1G-4S+OUT is a rugged outdoor 10G switch with 4 SFP+ ports, 1 Gigabit PoE-in port, RouterOS & SwOS dual-boot, ideal for fiber backbone deployments.
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MikroTik FiberBox Plus CRS305-1G-4S+OUT is a compact outdoor-oriented Cloud Router Switch designed for high-speed fiber connectivity in locations where standard indoor network switches are not suitable. It combines four 10G SFP+ ports with one Gigabit Ethernet port in a rugged IP66-rated enclosure.
The switch is built around the Marvell 98DX226S switch chip and features a dual-core 800 MHz ARM processor, 256 MB RAM and 16 MB flash storage. It supports both RouterOS v7 and SwOS, allowing the device to be used either as a feature-rich MikroTik RouterOS-based switch or as a simplified switch-management platform through SwOS.
With four SFP+ interfaces, the MikroTik FiberBox Plus is suitable for connecting multiple 10Gbps fiber links in outdoor network infrastructure, backbone links, aggregation points, tower installations and other environments where fiber connectivity needs to be protected from weather and water exposure.
The main advantage of the CRS305-1G-4S+OUT is its four SFP+ ports. Each SFP+ interface supports up to 10Gbps connectivity, making the switch suitable for 10G fiber uplinks, network aggregation and high-bandwidth backbone applications.
The SFP+ cages provide flexibility because the required optical or copper modules can be selected according to the network design. Fiber modules can be used for longer-distance links, while compatible SFP/SFP+ modules can be selected for shorter connections or different media requirements.
When planning a 10G fiber network, the actual link speed and distance depend on the selected SFP/SFP+ transceiver, fiber type, connector, optical budget and network configuration.
Along with its four 10G SFP+ ports, the MikroTik FiberBox Plus provides one 10/100/1000 Gigabit Ethernet port. This port can be used for management access or regular Ethernet traffic forwarding.
This combination makes the CRS305-1G-4S+OUT useful in network deployments where several high-speed fiber connections need to be aggregated while maintaining a conventional copper Ethernet interface for management or local connectivity.
The FiberBox Plus is specifically designed for environments where protection against water and outdoor conditions is important. Its enclosure carries an IP66 ingress protection rating, providing protection against dust and powerful water jets from different directions.
This makes the MikroTik FiberBox Plus CRS305-1G-4S+OUT suitable for applications such as outdoor fiber distribution points, tower infrastructure, industrial sites, network cabinets, utility infrastructure and other installations where a conventional indoor switch may not provide the required environmental protection.
The manufacturer specifies a tested ambient temperature range of -40°C to +70°C, allowing the device to operate across a wide range of environmental conditions when installed according to MikroTik’s installation requirements.
Unlike a basic unmanaged fiber switch, the FiberBox Plus supports RouterOS v7 and SwOS. This dual-boot capability allows network administrators to select the operating environment according to their requirements.
The choice between RouterOS and SwOS depends on the intended network architecture, management requirements and desired feature set.
The CRS305-1G-4S+OUT uses the Marvell 98DX226S switch chip and is included by MikroTik among the CRS3xx devices supporting Layer 3 hardware offloading. This can help selected routing functions be processed efficiently by the switch hardware rather than relying entirely on the CPU.
Actual routing performance depends on the RouterOS configuration, traffic characteristics and enabled features. MikroTik’s published benchmark results should therefore be treated as reference measurements rather than a guarantee of performance in every deployment.
The MikroTik FiberBox Plus provides multiple power-input options. It supports 802.3af/at PoE-in and also provides DC and terminal power inputs.
This flexibility can be useful in outdoor deployments where power may already be available through PoE or where a dedicated DC power source is preferred.
The FiberBox Plus is particularly relevant for network designs where copper Ethernet distance limitations make fiber a more practical choice. Its four SFP+ ports allow multiple high-speed optical links to terminate at a single outdoor switching point.
Typical applications include:
The MikroTik FiberBox Plus CRS305-1G-4S+OUT provides a practical combination of high-speed SFP+ connectivity, Gigabit Ethernet management, flexible power input and weather-resistant enclosure design.
Its four 10G SFP+ ports make it particularly suitable when multiple 10Gbps fiber links need to be aggregated at an outdoor or environmentally exposed location. The IP66 enclosure adds another layer of deployment flexibility compared with standard indoor switches.
| Specification | Details |
|---|---|
| Product Name | MikroTik FiberBox Plus |
| Product Code | CRS305-1G-4S+OUT |
| Device Type | Outdoor Cloud Router Switch |
| Ethernet Port | 1× 10/100/1000 Mbps Gigabit Ethernet |
| SFP+ Ports | 4× 10G SFP+ |
| CPU | Marvell 98DX226S, 800 MHz |
| CPU Cores | 2 |
| RAM | 256 MB |
| Storage | 16 MB Flash |
| Operating System | RouterOS v7 / SwOS |
| RouterOS License | Level 5 |
| PoE Input | 802.3af/at |
| PoE-in Voltage | 42–57V |
| DC Input | 24–57V |
| Maximum Power Consumption | 17W |
| Ingress Protection | IP66 |
| Operating Temperature | -40°C to +70°C |
| Serial Console | RJ45 |
| Switch Chip | Marvell 98DX226S |
| Dimensions | 330 × 200 × 70 mm |
The MikroTik FiberBox Plus is suitable for network professionals, ISPs, WISPs, system integrators, enterprises and infrastructure teams that require multiple 10G fiber interfaces in an outdoor-capable enclosure.
It is especially useful when the network design requires 10G SFP+ connectivity combined with IP66 protection and flexible power options.
| Brand | MikroTik |
| Model | CRS305-1G-4S+OUT |
| Series | FiberBox Plus |
| Product Type | Outdoor 10G SFP+ Cloud Router Switch |
| Network Ports | 1× Gigabit Ethernet + 4× 10G SFP+ |
| Management Software | RouterOS v7 / SwOS |
| PoE | 802.3af/at PoE-in |
| Protection | IP66 |
| RAM | 256 MB |
| CPU | Dual-core 800 MHz ARM |
| Primary Use | Outdoor 10G fiber aggregation and switching |
MikroTik FiberBox Plus CRS305-1G-4S+OUT is an outdoor-capable 10G fiber switch featuring four 10G SFP+ ports and one Gigabit Ethernet port. It supports RouterOS v7 and SwOS.
The CRS305-1G-4S+OUT has four 10G SFP+ ports.
Yes. All four SFP+ interfaces are designed for up to 10Gbps connectivity using compatible SFP+ modules and fiber infrastructure.
Yes. The FiberBox Plus has an IP66-rated enclosure and is designed for deployments where additional protection against dust and water is required.
It supports 802.3af/at PoE-in for powering the switch. The PoE function is input power and should not be confused with PoE-out for powering other devices.
Yes. The CRS305-1G-4S+OUT supports RouterOS v7 and also supports SwOS, providing a dual-boot operating system choice.
The CRS305-1G-4S+OUT is the FiberBox Plus version designed for outdoor-capable deployment with an IP66 enclosure. The CRS305-1G-4S+IN is the standard indoor CRS305 model with an IP20 enclosure.
Yes. Its four 10G SFP+ ports, Gigabit Ethernet interface, RouterOS support and outdoor-oriented enclosure make it suitable for many ISP, WISP and fiber aggregation applications.
The SFP+ transceivers are not the four built-in network ports themselves; compatible SFP/SFP+ modules must be selected according to the required fiber type, distance and optical specifications.
MikroTik specifies maximum power consumption of up to 17W, with approximately 7W maximum consumption without attachments.
IPVOICE TECHNOLOGIES provides MikroTik networking products for enterprise networks, ISP/WISP deployments, fiber infrastructure and professional networking projects. For the MikroTik FiberBox Plus CRS305-1G-4S+OUT, contact our team for current pricing, stock availability, GST billing and project requirements.
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