This attribute indicates whether an AIS (Alarm Indication Signal)
alarm is being transmitted on the outgoing JT2 line. Currently the
JT2 port only transmits a Physical AIS (no Payload AIS) on the
outgoing JT2 line.
Since there is no Idle signal defined for JT2, the AIS signal is
transmitted when the JT2 port is in the operationalState of locked.
The AIS signal may also be transmitted for diagnostic testing.