Find the family.
Then the exact fit.

5–64 ports; 10/100/1G/2.5G/10GbE; DIN/rack; managed/unmanaged and PoE to 90 W/port

2–24+ Ethernet/serial/cellular ports; 100 Mbps–10 Gbps; VPN/MPLS/SD-WAN and substation-rated

2–24 ports; 100 Mbps–10 Gbps; transparent/routed; DPI, VPN and IEC 62443 features

1–64 serial ports; RS-232/422/485 to Ethernet/cellular/fibre; Modbus/DNP/IEC protocols

1–64 channels; serial/Ethernet/fieldbus/utility protocols; standalone or rack

100 Mbps–10 Gbps; single/multimode; 2–120+ km optical reach; redundant power

Wi-Fi 4/5/6/6E; 2.4/5/6 GHz; 100 Mbps–multi-Gbps; AP/client/mesh and rail/mobile variants

Sub-microsecond to tens-of-ns accuracy; IRIG-B, NTP, PTP, pulse and serial outputs

Sub-microsecond to <100 ns class; 1/10GbE, GNSS holdover and redundant timing

2–32+ protection channels; C37.94/E1/T1/Ethernet/optical; <10 ms latency and redundant paths

Multiple serial/Ethernet/GOOSE channels; protocol conversion, encryption and timing

Narrowband radio/PSTN legacy through 4G/5G/LTE-M and private RF; serial/Ethernet interfaces

16–256+ IEDs; IEC 61850/DNP3/IEC 60870/Modbus; redundant server/router architectures

2–32+ I/O/serial/Ethernet/cellular; edge compute, MQTT/OPC UA and cloud connectivity

Single asset through hundreds of sensors; cellular/satellite/Ethernet; battery/solar and rugged variants