The layer above the camera switches: 10G SFP+ ports for inter-cabinet links, NVR write bursts and server connections. Managed firmware gives VLANs, link aggregation and SNMP, so a multi-cabinet site behaves like one network instead of several islands.
Aggregating four to eight 1G or 2.5G camera switches onto one backbone, or feeding an NVR that writes thirty 4K streams at once. Below that, a 2.5G uplink is enough and the 10G ports sit idle.
VLAN separation between CCTV and office, LAG trunks between cabinets, QoS so recording traffic is not starved by playback, and SNMP so the switch reports into the customer's monitoring instead of failing silently.
Examples: RS1008K-8L-12S-10G-M3 for an eight-port 10G aggregation node, RS1024K-24S-2S-40G-M for a 24-port core with 40G uplink.