This read-only INTEGER reports whether a PoE power module is physically present, yes, or absent, no, on the associated stack unit. An admin troubleshooting why PoE devices on a particular unit are not powering up should check this first, since a missing PoE module makes any PoE-related configuration on that unit's ports moot. For example, if an IP phone plugged into a port on unit 2 will not power on and this field reports no for that unit, the admin knows the unit itself lacks a PoE module rather than there being a port-configuration problem.