Managed L3 Network Switch MikroTik CRS310-1G-5S-4S+IN PoE 1U

The MikroTik CRS310-1G-5S-4S+IN PoE 1U is a managed Layer 3 network switch designed for indoor rack installations where compact, high-throughput fibre connectivity is required. This 1U rack-mountable unit provides five 1G SFP ports, four 10G SFP+ ports and an additional native Gigabit Ethernet port with a direct hardware connection to the switch chip. The device supports Power over Ethernet (PoE-in) and accepts a wide DC input range of 18–57 V, enabling flexible power arrangements in constrained environments. With an ARM v7 CPU, 256 MB RAM and Marvell switching silicon, the CRS310 delivers hardware-offloaded VLAN filtering and partial hardware-offloaded Layer 3 routing, suitable for small offices, ISP access points and branch networks.

Advantages

The CRS310-1G-5S-4S+IN combines multi-gigabit fibre ports and a dedicated Gigabit Ethernet port in a single 1U chassis, reducing the need for additional devices. Hardware offload for VLAN filtering and some L3 routing decreases CPU load and improves throughput for mixed switching and routing tasks. PoE-in capability and a broad DC input range simplify powering in installations where AC outlets are limited or where centralized DC power is used. Rack-mount compatibility and improved cooling make it suitable for continuous operation in standard equipment racks.

Suitable for

• Small and medium ISPs providing 10 Gbps fibre links over distances exceeding 100 meters
• Small office and branch networks requiring consolidated SFP and SFP+ ports
• Upgrading existing CRS212 or similar deployments to add 10G uplinks
• Indoor installations where PoE-in or DC power supply is preferred

Key specifications

• Port count: five 1G SFP ports, four 10G SFP+ ports, one Gigabit RJ‑45 port
• Layer: Managed L3 with hardware-offloaded VLAN filtering and partial L3 routing
• Processor and memory: ARM v7 CPU, 256 MB RAM
• Power options: PoE-in support and DC input range 18–57 V
• Form factor: 1U rack-mountable chassis with improved cooling
• Console access: RJ‑45 serial console port for configuration and management

How to use

Install the CRS310-1G-5S-4S+IN into a standard 1U rack space and connect fibre transceivers appropriate for your SFP and SFP+ modules. Use the Gigabit RJ‑45 port for direct copper uplink or management access where required. Supply power via an appropriate DC source within the 18–57 V range or use a compatible PoE source on the PoE-in capable port. Access the web interface or command-line console through the RJ‑45 console port to configure VLANs, static routes and switching profiles. Apply firmware updates and verify SFP/SFP+ module compatibility before production deployment.

Usage recommendations

For reliable long-distance 10G fibre links, use quality single-mode or multimode SFP/SFP+ transceivers as appropriate for your cabling and distance. Enable hardware-offloaded VLAN filtering for networks with heavy VLAN usage to reduce CPU load. When deploying in racks, ensure adequate airflow and leave space above and below the unit if adjacent devices generate heat. Regularly back up configuration and monitor port status to detect fiber link degradation early.