Many Ericsson Enterprise Wireless devices are capable of providing power to Ethernet-connected client devices by using Power over Ethernet (PoE). See the linked article below for the configuration of the Power Supply Equipment (PSE) functionality on your device. PSE operation is independent of port mode (LAN / WAN).
Configuring a Capable Ericsson Cradlepoint Device as PoE Power Sourcing Equipment (PSE)