Symmetricom 1100, 1000 manual Setting the Input Quality Level, Enabling Automatic Switching

Chapter 4 Provisioning the TimeProvider

Provisioning the Input Reference

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.

<aid>	<keyword>	<value>	Description	Default value
SYS	REFMODE	AUTO FORCED	Sets the reference	AUTO
			selection mode

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.

112 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008