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 |