MikroTik FiberBox Plus 1×GbE 4×SFP+ 10G IP66 Outdoor Switch
The MikroTik FiberBox Plus is a compact, ruggedised outdoor fibre switch designed for high-mast, pole, and tower deployments where reliable 10-Gigabit connectivity is needed in the field. Built around the Marvell 98DX226S switch chip with a 32-bit ARM CPU running at 800 MHz and 256 MB of RAM, it features one Gigabit Ethernet port and four 10G SFP+ ports, giving it a significant throughput advantage over its predecessor. It runs both RouterOS v7 and SwOS, offering flexibility between full-featured routing and streamlined switch management. Three power input options — 802.3af/at PoE-in, a DC jack, and a 2-pin terminal — make it easy to integrate into existing outdoor deployments. With an IP66 water-resistance rating providing protection against powerful water jets from any direction.
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The FiberBox Plus (CRS305-1G-4S+OUT) is a major upgrade over MikroTik's earlier FiberBox line and positions itself as an accessible outdoor alternative to the netFiber 9. The centrepiece of the upgrade is the Marvell 98DX226S switch chip — the same impressive chip found in higher-end MikroTik hardware — which enables four true 10-Gigabit SFP+ ports alongside a single Gigabit Ethernet port. The ARM 32-bit CPU runs at 800 MHz and is backed by 256 MB of RAM and 16 MB of FLASH storage, providing a solid platform for running RouterOS v7 or the simpler SwitchOS interface depending on the operator's preference.
The FiberBox Plus is an ideal aggregation point for mast-top devices such as wireless backhaul radios and sector antennas. It connects directly to whatever is mounted at height, eliminating the need to run individual cables down to a separate indoor switch and reducing both installation complexity and latency in the path. The unit's passive cooling design — with no moving parts — contributes to long-term reliability in unattended outdoor environments.
Power flexibility is a standout feature of this switch. It accepts 802.3af/at PoE-in on its Ethernet port (42–57 V), a standard DC jack (24–57 V), or a 2-pin terminal connector (24–57 V), so it can be powered via a PoE injector, a direct DC supply, or integrated into a panel or custom enclosure. Maximum power consumption is 17 W under load and just 7 W without attached devices. A Gigabit PoE injector is included in the box for convenient out-of-the-box deployment.
The enclosure carries an IP66 rating, meaning it is fully dust-tight and withstands powerful water jets from any direction — no additional weatherproofing box is needed. The unit ships with two fastening sets (K-41 and K-72) and two hose clamps to facilitate mounting on poles or masts of varying diameters, along with a 48 V power adapter and a Gigabit PoE injector.
Switching performance is non-blocking at Layer 2, with full line-rate throughput across all five ports. Certifications include CE, EAC, and RoHS compliance, and the device carries an IP66 environmental rating. Tested ambient operating temperature spans -40 °C to 70 °C, making it suitable for extreme cold and heat environments worldwide.
Key Specifications at a Glance
- Product Code: CRS305-1G-4S+OUT
- Architecture: ARM 32-bit
- CPU: Marvell 98DX226S @ 800 MHz
- Switch Chip: 98DX226S
- RAM: 256 MB
- Storage: 16 MB FLASH
- Operating System: RouterOS v7 / SwOS
- Ethernet Ports: 1× 10/100/1000 Mbps (RJ45, PoE-in)
- SFP+ Ports: 4× 10G SFP+
- Serial Console Port: RJ45
- Power Inputs: 3 (802.3af/at PoE-in 42–57 V, DC jack 24–57 V, 2-pin terminal 24–57 V)
- Max Power Consumption: 17 W (7 W without attachments)
- Cooling: Passive
- IP Rating: IP66
- Operating Temperature: -40 °C to 70 °C
- MTBF: ~200,000 hours at 25 °C
- Certifications: CE, EAC, RoHS
- Included: 48 V power adapter, Gigabit PoE injector, K-41 fastening set, K-72 fastening set, 2× hose clamps
- Product code
- CRS305-1G-4S+OUT
- Architecture
- ARM 32bit
- CPU core count
- ARM 32bit
- Switch chip model
- 98DX226S
- Operating System
- RouterOS v7, License level 5 / SwitchOS
- Size of RAM
- 256 MB
- Storage size
- 16 MB
- Storage type
- Flash
- Number of DC inputs
- 3 (PoE-in, DC jack, 2-pin terminal)
24-57 V - Max Power consumption
- 17 W
- Max power consumption without attachments
- 7 W
- PoE in input Voltage
- 42-57 V 802.3af/at
- Dimensions
- 330 x 200 x 70 mm
- 2-pin terminal input Voltage
- 24-57 V
- Operating Temperature
- -40°C to +70°C
- Number of 10G SFP+ ports
- 4
- Number of 1G Ethernet ports
- 1
