System Management
378
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Description The synchronous equipment timing subsystem can lock to three different timing reference
inputs, those specified in the ref1, ref2, external, and bits command configuration. This
command organizes the priority order of the timing references.
If a reference source is disabled, then the clock from the next reference source as defined by
ref-order is used. If the reference sources are disabled, then clocking is derived from a local
oscillator.
If a sync-if-timing reference is linked to a source port that is operationally down, the port will
no longer be qualified as a valid reference.
For unfiltered BITS output (T4), all reference sources are valid options, except the BITS input,
which is excluded to avoid a timing loop. Because the same priority order is used for the
SETG output (T0), the BITS input option must be set as the first (highest-priority) reference
option.
The no form of the command resets the reference order to the default values.
Default external, ref1 ref2
Parameters first — specifies the first timing reference to use in the reference order sequence
Values ref1, ref2, external, bits
second — specifies the second timing reference to use in the reference order sequence
Values ref1, ref2, external, bits
third — specifies the third timing reference to use in the reference order sequence
Values ref1, ref2, external, bits
ref1
Syntax ref1
Context config>system>sync-if-timing
Description This command enables the context to configure parameters for the first timing reference.
ref2
Syntax ref2
Context config>system>sync-if-timing
Description This command enables the context to configure parameters for the second timing reference.
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