This object indicates current status of PLCP. This object
only applies to port which sublayer is configured to PLCP.
A value of 1 is returned for other cases.
The dsx3PortStatsPlcpStatus is a bit map represented as a
sum, therfore it can represent multiple alarms.
1 - plcpNoAlarm No alarm present
2 - plcpOof Out of frame
4 - plcpLof Loss of frame
8 - plcpYellow Receive yellow alarm from far-end