This vector attribute, indexed with activeCP or alternate, represents
the state of the bus clock sources. It can be set to one of the
following values:
ok: all operational cards can receive signals from the clock source.
failed: at least one operational card is unable to receive signals from
the clock source.
unknown: status of a clock source is unknown. To determine the
status of the clock source, a test must be run.
testInProgress: the clock source is currently being tested.
notApplicable: the LP state of the clock source's card is down or
not provisioned.