Clock Module


The clock module provides an internal reference for measuring input signal phase. The CPU module locks the clock to the selected input and maintains tracking with the variable control value. When the inputs are not available, the clock enters Holdover mode and frequency is maintained at the last valid setting. The clock module also supplies reference signals to the Frame Generator module for all output signal generation.

The module's LEDs are described in the following table. The screen's fields are described in the table below.

LED Indicator

Color

Description

POWER

Green

On = The module is receiving power

LOCKED

Green

On = Unit is in Normal mode of operation

SELECTED

Green

On = Module selected for providing outputs

EXT REF

Green

This indicator is not used

HOLDOVER

Yellow

On = Unit is in Holdover mode of operation

END OF RANGE

Yellow

On = Tuning is below 25% or above 75% of full scale

ACQUIRE

Yellow

On = Unit is in Acquire mode of operation

FAULT

Red

On = Fault within the module

Blinking = Module is disabled

Field/Section

Description

Clock Status

 

AID

Access Identifier (AID) denotes a module or port within the TSG-3800

Type

Indicates the type of clock module

Mode

This field displays the current clock mode. Values: Acquire, Locked, Holdover or Warmup.

Status

The Status field indicates the clock module status. States are Reference, OK, Monitor, or Disabled.

Current 1 Second

Indicates the current 1 second control value

Current 100 Second

Indicates the current 100 second control value

Tau

The Tau value indicates how long data is averaged (in seconds) to compute the output frequency control loop.

Alarm Status

Indicates whether any alarms are currently active

Alarm

Indicates the alarm number

AID

Indicates alarm AID

Notification Code

Indicates alarm level. Values: Critical, Major, or Minor

Condition Type

Condition type for alarms or events

Service Affecting

This field Indicates whether an alarm response message affects service. Values: SA or NSA

Description

Text description of the alarms indicated