Cpu Module - Symmetricom TSG-3800 Series User Manual

CPU Module

The TSG-3800 main shelf requires one Processor (CPU) module. The CPU Module
controls and monitors main shelf operation. This module communicates with a
peripheral device to provide operator-control of the TSG-3800. The CPU module
performs the following processes:
Reads the configuration data, identifies the types of modules installed, and sets
operational parameters
Collects and stores data, such as configuration data, collected measurement,
alarm, and operator-control setting data. It also reports data through the use of
two EIA-232 ports
Analyzes the input signals and selects the active reference based upon the
results
Measures the phase and frequency of all input signals
Calculates Maximum Time Interval Error (MTIE) and frequency
Adjusts the frequency of each Clock module, based on phase changes in the
selected reference
Performs logic functions for activating Critical, Major, and Minor alarms. Triggers
alarm relays, reports event, and takes corrective action
Sets the TSG-3800 operating mode; Warm-up, Acquire, Locked, or Holdover
Monitors system and module status; identifies and reports module failure
See Chapter 6, CPU, Frame Generator, and Clock
on the CPU module.
An internal microprocessor in the CPU module performs a high-resolution
comparison of each input signal against the system clock. In comparing, the
TSG-3800 measures the frequency and maximum time interval error (MTIE)
deviations between each input and the internal clocks. The TSG-3800 also counts
signal error events, for example, the number of measurement intervals containing a
loss of signal. When the amount of input errors or MTIE/frequency derivation
passes a threshold, the TSG-3800 declares a fault for that channel. The operator
determines the severity of the alarm caused by this fault. Alarm responses include
ignoring the fault, failing the input, switching references, and activating the remote,
local, and audio relays. When a reference is not available for switching, an internal
Clock module provides the synchronization reference for Holdover mode.
The microprocessor stores instrument configuration information, operating status,
and signal data. It also records faults, changes in configuration, and changes in
operating status. The operator can retrieve this information remotely as described in
Chapter 3, Operating the
12778474-002-2 Revision F – March 2004
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TSG-3800.
Overview of the TSG-3800 Series
Functional Description
Modules, for more information
TSG-3800 User's Guide 33