6 • System Clocking
Model 6511RC Switch Matrix Administrators’ Reference Guide
44
System Clocking Overview window
•
disable(0)
•
enable(1)
Once you have defined the desired value for the Enable/Disable Auto Recovery System parameter, you must click
the Modify button below the auto recovery feature menu to save your selection into volatile DRAM.
Module Clocking Source (daxClockMainRef and daxClockFallbackRef)
The Primary Reference and Fallback Reference parameters define a primary and secondary (fallback) reference for
the 6511RC system clock source (and for all blades in the chassis when the 6511RC’s clocking mode is defined as
master). The 6511RC will use the fallback reference if and only if the primary reference becomes unavailable. By
default, the clocking fallback mechanism is disabled at the factory before the 6511RC is shipped. To activate the
6511RC’s fallback system you must enable it (see section
“Module Clocking Fallback”
).
When defining the main and fallback clocking sources, you can select the STM-1 WAN port, the 6511RC
internal clock pulse oscillator, or a system clock provided by another blade in the same chassis. The 6511RC
will use the main reference as its system clocking source unless the main reference fails or is disconnected.
When the primary reference becomes unavailable 6511RC will switch to the fallback reference as its system
clocking source.
Both parameters will be defined from the same set of possible values. For the fallback reference to serve its pur-
pose, however, you must define it by selecting a value different from the main reference. You must also enable
the 6511RC’s fallback mechanism (see Enable/Disable Fallback System). For the 6511RC’s primary and sec-
ondary clocking references, you can choose:
•
WAN(602)—Clocking derived from the SDH network clock received at the STM-1 interface.
•
internal(200)—Uses the 6511RC internal free-running oscillator for the clock source.
•
system(500)—Uses the system clock reference provided by another blade in the chassis for the clock source.
Automatically selected when the card is operating in slave mode.
Module Clocking Fallback
This parameter defines the 6511RC’s clocking fallback mechanism as enabled or disabled. By default, the
clocking fallback mechanism is disabled at the factory before the 6511RC is shipped. To activate 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
adjacent Modify button to save your selection into volatile DRAM.
Operator Actions buttons
The immediate actions buttons with their respective functions are described below:
•
Clear Fallback—Clicking the Clear Fallback button clears the system clocking fallback state by setting the
value of fallback state to primary(0). The 6511RC will stop using the fallback reference and return to using
the defined primary reference as its clocking source
Summary of Contents for 6511RC
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