The XMG1915-10EP is a 8-Port 2.5GbE Smart Managed Switch with 2 SFP+ Uplink and up to 130 Watts of PoE power on the 8 2.5GbE ports
Power is supplied via a 54 VDC, 2.77 A barrel connector
PoE is controlled by 2 Realtek RTL8239 4-port 802.3bt-Compliant PSE controllers via the Nuvoton NUC029ZAN ARM microcontroller.
Header J5 has a UART
Pin 1 is identified closest to the JP5 marking.
Header J2 is MIPS EJTAG:
Pin 1 is identified with a white dot on opposite end to the J2 marking.
Device uses the ZyXel Bootbase V1.00 bootloader and ZyNOS Version: V4.80(ACGO.3)