OpenGear

• OM2248-L - 48 ports with modem

Raritan

• DSX2-48M - 48 ports with modem
• https://www.raritan.com/products/kvm-serial/serial-console-servers/serial-over-ip-console-server

Eaton Tripp lite

• https://tripplite.eaton.com/48-port-serial-console-server-2-usb-ports-dual-gbe-nic-16gb-flash-sd-card~B098048