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Chapter 4 Provisioning the TimeProvider
Provisioning the Input Reference
112 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008
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 114).
ED-SYNC:[<tid>]:<aid>:[<ctag>]::<keyword>=<value>;
This command has a default access level of ADMIN.
Sample Command
ED-SYNC::SYS:TS1000::REFMODE=AUTO;
Autonomous Message
TP-SSU 03-10-24 10-52-25
A 1182 REPT EVT
“SYS,EQPT:NA,REFMODE,NSA,03-10-24 10-52-25:\”SYSTEM
REFERENCE MODE HAS CHANGED,AUTO\””
;
Setting the Input Quality Level
Use the ED-SYNC command to set the quality level (QLEVEL) of the specified
input. You set the QLEVEL when using inputs that do not have an associated SSM,
or when you want to set an alarm threshold for inputs that have SSMs. The
QLEVEL determines the TimeProvider’s output SSM.
If you provision QLEVEL below the quality level of the local oscillator in the IOC,
then the TimeProvider disqualifies the input with the INPQL alarm. An INPQL alarm
also occurs if the incoming SSM indicates that the input signal is below the quality
level of the local oscillator or if the incoming SSM is below the provisioned level.
Normally, you provision the QLEVEL for each input to be either unique or all the
same. If you set all QLEVEL for inputs to unique values, then you have set up a
revertive switching strategy. If you set all inputs to the same value, then you have
set up a non-revertive switching strategy.
<aid> <keyword> <value> Description Default value
SYS REFMODE AUTO | FORCED Sets the reference
selection mode
AUTO