Hi,
Please find below,
J9406A HP 1-port Power Injector, that can be used
https://fast.ulmart.ru/manuals/275961.pdf
Power supply
The MSM422 is intended to have its power supplied by a Listed Information Technology Equipment
AC Adapter, Wall Industries Inc., Model GPSU30A-8, rated output 33-50 Vdc, 0.91-0.61 A,
available as HP part number J9406A. As an alternative, the MSM422 may be connected to an
external PoE source.