This bitmask indicates which performance monitoring selectors
this slot can support. This object is mandatory for all slots
in systems where the nbsEusmSlotPmSelector object is supported.
Each capability is represented by one bit. Set bit to 1 to
advertise capability, 0 to deny it.
Capability Bit
-------------- ---
reserved 0
notSupported 1
coToCpe 2
cpeToCo 3
cpeTx 4
cpeRx 5
OCTET STRING bitmasks count the leftmost bit (MSB) as 0.
A zero length OCTET STRING indicates that this object is not
supported.