An integer corresponding to the Errored Frame Seconds
Threshold field in the most recently transmitted Errored
Frame Seconds Summary Event TLV in an Event Notification
OAMPDU (see 57.4.3.2). This integer is updated when a
OAM:MA_DATA.request service primitive is generated within
the OAM sublayer with an OAMPDU Code field value equal to
the Event Notification code as specified in Table 57-4 and
Event TLV Type field equal to the Errored Frame Seconds
Summary Event value as specified in Table 57-10.