What is the CRS354-48P-4S+2Q+RM?

It is a Layer 2/3 managed switch running RouterOS (Level 5 license) that combines 48 Gigabit RJ45 ports with 4 10G SFP+ ports and 2 40G QSFP+ ports. Unlike many entry-level switches, this model offers a total power budget of 750 W, making it suitable for powering large installations of access points or IP cameras without the need for separate external power supplies.

What are the main technical specifications?

  • Ethernet ports: 48 x 1 GbE RJ45 (Ether1-Ether48), 4 x 10G SFP+, 2 x 40G QSFP+.
  • PoE-out power: Supports IEEE 802.3af/at and Passive PoE at 26V or 53V on all 48 RJ45 ports.
  • PoE power: Up to 30 W per port (53V) or 26 W per port (26V); maximum total budget of 750 W.
  • Switching performance: Non-blocking throughput of 168 Gbps and switching capacity of 336 Gbps.
  • Hardware: QCA9531 CPU at 650 MHz, 128 MB RAM, 32 MB flash storage.
  • Power supply: Internal AC power supply (100-240 V), maximum power consumption of 800 W with full PoE load.
  • Dimensions: 443 x 382 x 44 mm, standard rackmount form factor.
  • Operating system: RouterOS v6.45.7 (or higher) with a Level 5 license.

Who is it for and in which scenarios does it make sense?

This switch is ideal for WISPs, data centers, and offices that require a single device to handle both high-speed data traffic and the power supply for dozens of PoE devices. The presence of 40G QSFP+ ports makes it particularly useful as a core switch in architectures where it is necessary to aggregate traffic from downstream switches or connect to edge routers with very fast uplinks.

What to know before choosing it?

The integrated CPU, while sufficient for basic RouterOS functions, has limitations in Layer 3 performance if you use many filtering rules or queues. Tests show that routing speed drops significantly as the number of rules increases (e.g., from ~430 Mbps to ~290 Mbps with 25 IP filter rules). Additionally, the maximum power consumption of 800 W requires careful evaluation of the electrical installation and ventilation in the rack cabinet.

Frequently asked questions

Does the CRS354-48P-4S+2Q+RM support Passive PoE?

Yes, the CRS354-48P-4S+2Q+RM supports Passive PoE at 26V or 53V on all 48 RJ45 ports, in addition to the IEEE 802.3af/at standard.

What is the total power budget of the CRS354-48P-4S+2Q+RM?

The total PoE power budget of the CRS354-48P-4S+2Q+RM is 750 W, with a maximum overall device power consumption of 800 W when all ports are active.

Does the CRS354-48P-4S+2Q+RM have 40G ports?

Yes, the CRS354-48P-4S+2Q+RM features two 40 Gbps QSFP+ ports for high-speed fiber connections or interconnection with other 40G devices.

What type of RouterOS license does the CRS354-48P-4S+2Q+RM have?

The CRS354-48P-4S+2Q+RM comes with a Level 5 RouterOS license, which allows the use of most advanced features of the operating system.

Learn more on the MikroTik website: CRS354-48P-4S+2Q+RM page and official datasheet (PDF).