Symmetricom SDU-2000, User Manual

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Interactive Command Set
364 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
REF
Use this command to access the input reference selection modes and settings.
Level 0 Not applicable
Level 1
REF
Use this command to display the current input reference port and
selected clock.
Level 2 Same as Level 1 operation
Level 3 Same as Level 2 operation, with the following additions:
REF xAy-z
REF {AR|AS|OFF}
REF {PRIORITY|PQL}
Use the first command REF xAy-z to select a given input port as
current input reference.
Options are:
{AR}
Use this option to enable the input autoreturn
(Revertive) switching mode.
{AS}
Use this command to enable the input autoswitch
(Non-revertive) switching mode.
{OFF}
Use this command when no switching is used.
PRIORITY
Use this option to set the PRIORITY as the input
selection mode.
Note: If the clock module is already selected as an input reference
and is not in AS OFF mode, this command has no effect. If both
clocks are removed or in warm-up mode, this command can set an
initial input reference port for use as the Clock C pass through. Other
commands allow you to set input switch methods and input selection
modes.
Note: Input reference selection order proceeds from highest (1) to
lowest (10) priority valid input port. If the inputs have equal Priority
level, the PQL value is used to distinguish between them.