Symmetricom 1100 User Manual

Chapter 4 Provisioning the TimeProvider

This section describes how to provision the IOC.

The SET-SYS-MODE command allows you to provision the operating mode of the 
TimeProvider to one of the following:

SSU – Synchronization Supply Unit: provides filtering compliant with G.812 and 
GR-1244

SUB – Subtending mode: provides composite clock input tracking compliant with 
GR-378

PRR – Primary Reference Receiver mode: provides ITU-T G.811 and Telcordia 
GR-2830 requirements for Primary Reference Receivers/Clocks

In the SSU mode, you can select the system reference from signals on the GPS, 
PRS, INP1, or INP2 connectors.

In the SUB mode, the PRS input is set to Monitor only; you can select the system 
reference from signals on the INP1 or INP2 connectors. You can provision these 
inputs to Composite Clock signal types only when the TimeProvider is in SUB mode.

In the PRR mode, the antenna provides GPS signals as the primary reference. 
When enabled and qualified, the PRS, INP1, and INP2 signals are used as part of 
the BesTime algorithm only to enhance the stability of the output signals. If the GPS 
input is lost when in PRR mode, the TimeProvider enters the Holdover mode even if 
qualified signals are present on the other inputs.

Setting the System Mode
Use the SET-SYS-MODE command to provision the TimeProvider’s operating 
mode. See 

, on page 23, for more information on how the 

operating mode affects the TimeProvider’s inputs and outputs.

SET-SYS-MODE:[<tid>]::[<ctag>]::<keyword>=<value>;

This command has a default access level of ADMIN.

SYSMODE

SSU

Set the TimeProvider to SSU operating mode

PRS – Priority 1 and Enabled

INP1 – Priority 2 and Enabled

INP2 – Priority 3 and Enabled

GPS – Disabled and can be enabled

SSU