Configuring The Clock Module; Clock Characteristics Definitions - Symmetricom TSG-3800 Series User Manual

Table 6-10. Clock Characteristics Definitions
Characteristic
Accuracy The maximum long-term deviation from the nominal frequency with no
(Free Run Mode) external reference applied. In typical operation the Clock module is never in
this mode after initial start up.
Stability The maximum rate of change of the clock frequency over time and
(Holdover Mode) temperature after loss of all external frequency reference.
Pull-In Range The minimum frequency deviation from the nominal clock rate that can be
(Acquire Mode) overcome by the clock to synchronize with an external reference signal.
Lock Range The maximum frequency deviation from the average frequency of the
(Locked Mode) external reference signal when in normal operation.
Tuning Resolution The nominal step size of the frequency corrections to the clock applied by
(Locked Mode) the control algorithm.
Tau Time constant (secs) used for oscillator control loop.
Warm-Up Time The maximum time required from initial power application until the Clock
(Warm-Up Mode) module begins the acquisition process.
Acquisition Time The nominal time required for the clock to progress from the Warm-Up mode
(Acquire Mode) to the Locked mode of operation.
Wander (TIE) The long-term variation of a signal from the ideal position in time. (<10 Hz)
MTIE The maximum time interval error over a specified time period.
TDEV 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 The maximum frequency deviation from the average frequency of the
Temperature 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.

Configuring the Clock Module

This section describes how to configure the Clock module to meet the requirements
of your particular installation.
Caution: To prevent ESD damage to the module, always observe
the precautions described in
page 61.
12778474-002-2 Revision F – March 2004
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CPU, Frame Generator, and Clock Modules
Definition
Properly Handling the Modules, on
Clock Module
TSG-3800 User's Guide 183