The status of the 'cross-connect capability' relationship between two sub-layers. The following values are defined: capable(1) - the PME sub-layer interface, identified by the ifAvailableStackLowerLayer MAY be connected to run 'below' the PCS sub-layer interface, identified by the ifAvailableStackLowerLayer. outOfService(2) - the PME sub-layer interface cannot be connected due to unavailability of the interface. Note that PME availability per PCS, indicated by 'capable' value, can be constrained by other parameters, for example by aggregation capacity of a PCS or by the PME in question being already connected to another PCS. So, in order to ensure that a particular PME can be connected to the PCS, all respective parameters (e.g. ifAvailableStackTable, ifStackTable and efmCuPAFCapacity) SHALL be inspected. This object is read only, unlike ifStackStatus, as it describes the device capability.