Page 376 7450 ESS OS Basic System Configuration Guide
Note that if a sync-if-timing reference is linked to a source port that is operationally down, the port is no
longer qualified as a valid reference.
For systems with two SF/CPM modules, the system distinguishes between the BITS inputs on the active and
standby CPMs. The active CPM will use its BITS input port providing that port is qualified. If the local port
is not qualified, then the active CPM will use the BITS input port from the standby CPM as the next priority
reference. For example, the normal ref-order of “bits ref1 ref2” will actually be bits (active CPM), followed
by bits (standby CPM), followed by ref1, followed by ref2.
The no form of the command resets the reference order to the default values.
Default bitsref1 ref2 ptp
first — Specifies the first timing reference to use in the reference order sequence.
Values ref1, ref2, bits, ptp
second — Specifies the second timing reference to use in the reference order sequence.
Values ref1, ref2, bits, ptp
third — Specifies the third timing reference to use in the reference order sequence.
Values ref1, ref2, bits, ptp
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