097-58001-02 Revision C – August 2005 TimeProvider User’s Guide 103
Chapter 4 Provisioning the TimeProvider
Provisioning the Input Reference
Automatic Return to a Higher Priority Reference
When the REFMODE parameter is provisioned to AUTO, the system reference
switches when the input signal is disqualified. When the input signal is re-qualified,
the TimeProvider can either keep the current reference or switch back to the
re-qualified signal. The first case, keeping the current reference, is also known as
“non-revertive” mode; the second case, switching back to the re-qualified input, is
known as revertive mode.
The QLEVEL (Setting the Input Quality Level, on page 104) and the PRIORITY
(Setting the Input Priority Level, on page 105) parameters work together with SSMs
to determine the switching strategy for the inputs when the unit is in the SSU mode.
If the active/primary input becomes unavailable, the switching strategy determines
which input to use: the TimeProvider uses the input with the next highest QLEVEL.
If all inputs have the same QLEVEL, then the TimeProvider uses the input with the
highest PRIORITY.
To provision the TimeProvider as non-revertive, you must provision the
user-assigned Priority Level on all inputs to the same value (1, 2, 3, or 4). To
provision the TimeProvider as revertive, you provision any one of the inputs to a
higher or lower Priority Level, with 1 being the highest priority.
If the original primary input becomes available again, the REFMODE, QLEVEL and
PRIORITY parameters determine whether the TimeProvider switches back to that
input. If the QLEVEL and/or PRIORITY parameter of the original input is higher than
the current input, the TimeProvider reverts back to the original input. If the QLEVEL
parameter is the same for all inputs, then the TimeProvider does not revert back to
the original input.
Enabling Automatic Switching
Use the ED-SYNC command to set the reference selection to Automatic or Forced.
When set to Automatic, then the QLEVEL and PRIORITY parameters determine the
switching strategy to be revertive or non-revertive. When set to Forced, then the
TimeProvider uses the input selected with the INPREF keyword (see Manually
Selecting the Reference, on page 105).
ED-SYNC:[<tid>]:<aid>:[<ctag>]::<keyword>=<value>;
This command has a default access level of ADMIN.
Sample Command
ED-SYNC::SYS:TS1000::REFMODE=AUTO;
<aid> <keyword> <value> Description Default value
SYS System inputs
REFMODE AUTO | FORCED Sets the reference
selection mode
AUTO
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