
12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 183
CPU, Frame Generator, and Clock Modules
Clock Module
Configuring the Clock Module
This section describes how to configure the Clock module to meet the requirements
of your particular installation.
Table 6-10. Clock Characteristics Definitions
Characteristic
Definition
Accuracy
(Free Run Mode)
The maximum long-term deviation from the nominal frequency with no
external reference applied. In typical operation the Clock module is never in
this mode after initial start up.
Stability
(Holdover Mode)
The maximum rate of change of the clock frequency over time and
temperature after loss of all external frequency reference.
Pull-In Range
(Acquire Mode)
The minimum frequency deviation from the nominal clock rate that can be
overcome by the clock to synchronize with an external reference signal.
Lock Range
(Locked Mode)
The maximum frequency deviation from the average frequency of the
external reference signal when in normal operation.
Tuning Resolution
(Locked Mode)
The nominal step size of the frequency corrections to the clock applied by
the control algorithm.
Tau
Time constant (secs) used for oscillator control loop.
Warm-Up Time
(Warm-Up Mode)
The maximum time required from initial power application until the Clock
module begins the acquisition process.
Acquisition Time
(Acquire Mode)
The nominal time required for the clock to progress from the Warm-Up mode
to the Locked mode of operation.
Wander (TIE)
MTIE
TDEV
The long-term variation of a signal from the ideal position in time. (<10 Hz)
The maximum time interval error over a specified time period.
The time variation of a signal as a function of integration time.
Jitter
The short-term variation of a signal from the ideal position in time. (>10 Hz)
Operating
Temperature
The maximum frequency deviation from the average frequency of the
external reference signal when in normal operation.
Note:
Some clock parameters such as input jitter and wander
tolerance, filtering requirements, and rearrangements are
determined by other modules within the Timing Signal Generator.
Caution:
To prevent ESD damage to the module, always observe
the precautions described in
Properly Handling the Modules
, on
page 61.
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