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System Clocking Overview window
43
Model 6511RC Switch Matrix Administrators’ Reference Guide
6 • System Clocking
The System Clocking Overview window includes the following items:
•
Clocking Parameters section—Displays the configurable system clocking parameters and non-configurable
(display-only) parameters (see section
“Clocking Parameters section”
on page 43).
•
Operator Actions buttons section—Provides buttons for clearing the system fallback state, forcing the
6511RC into fallback clocking state, clearing error conditions, and displaying the clocking help window
(see section
“Operator Actions buttons”
on page 44).
•
Clocking Status Information table—Displays a set of display-only parameters intended for use by software
engineers during field debugging. Therefore, most 6511RC end-users will not use this information. (See
section
“”
on page 45.)
Clocking Parameters section
The following sections describe the system clocking parameters.
Note
When you are finished configuring the system clocking parameters, make
sure you save the changes (see section
“Saving your work”
on page 46).
Module Clocking Fallback (sysGSClockMode)
The Fallback Feature Desired State and the Auto Recovery Feature Desired State parameters define the 6511RC’s
clocking fallback and fallback auto recovery mechanism as enabled or disabled.
The fallback feature, when enabled, allows the 6511RC to switch to a secondary clock as follows:
•
Master or secondary mode—The 6511RC, upon failure of the primary reference clock source, will switch
to the selected fallback reference clock source.
•
Slave Mode—The 6511RC defaults (fallback feature options are not accessible to user) to system for both
main reference and fallback reference—since the slave cards do not provide clock to the chassis, they receive
clock from the system clocking bus provided by a master or secondary card.
By default, the clocking fallback mechanism is disabled at the factory before the 6511RC is shipped. To acti-
vate the 6511RC’s fallback system you must enable it. When disabled, the 6511RC will not use the fallback
reference clocking source, even if the primary reference becomes unavailable. To define the enable or disable
the fallback system parameter, select one of the following values from the drop-down menu.
•
disable(0)
•
enable(1)
Once you have defined the desired value for the Enable/Disable Fallback System parameter, you must click the
Modify button below the auto recovery feature menu to save your selection into volatile DRAM.
The Auto Recovery Feature Desired State, when enabled, will cause a 6511RC (in master or secondary mode),
which is operating on fallback reference clock due to a failure of the primary reference clock, to switch back to
primary reference clock when it becomes available.
By default, Auto Recovery Feature Desired State is disabled at the factory before the 6511RC is shipped. To acti-
vate the 6511RC’s clock auto recovery system you must enable it. When disabled, the 6511RC, operating on
fallback reference clock, will not switch back to primary reference clock, even if the primary reference becomes
available. To define the enable or disable the fallback system parameter, select one of the following values from
the drop-down menu.
Summary of Contents for 6511RC
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