MikroTik CRS504-4XQ-IN, 4 x 100G QSFP28, 1 x RJ45 Serial console port

The MikroTik CRS504-4XQ-IN is a compact 100 Gigabit Cloud Router Switch designed for high-speed networking in data centres and enterprise environments. It features four QSFP28 ports supporting 100G, 40G, 25G, 10G, and 1G fibre connections for versatile deployment. Powered by a Marvell Prestera 98DX4310 switch chip and a Qualcomm QCA9531 650 MHz CPU, it includes 64 MB RAM and 16 MB flash storage. Running RouterOS v7 (License Level 5), it delivers advanced switching and routing functionality. Multiple power options are supported, including 802.3bt PoE-in, DC jack, and a 2-pin terminal (36–57V). With low power consumption and a compact footprint, this switch is ideal for high-performance, space-constrained network setups.
Key features:

4x 100G QSFP28 ports
Supports 100G/40G/25G/10G/1G fibre connections
Marvell Prestera 98DX4310 switch chip
QCA9531 CPU (650 MHz), 64 MB RAM, 16 MB flash
RouterOS v7 (License Level 5)
Power input options: 802.3bt PoE-in, DC jack, 2-pin terminal (36–57V)
Max power consumption: 41 W (25 W idle)
MTBF: ~200,000 hours at 25°C
Operating temperature: -40°C to +70°C
Dimensions: 320 x 185 x 44 mm