Symmetricom XL-GPS User Manual

1

Alarm Definitions

Locked: The XL-GPS clock is locked to the GPS reference source and is operating within the F73 Time 
Error Threshold. 

Unlocked: Check the other alarm indicators to determine the cause of the problem. 

Locked: The clock PLL is locked and operating nominally.

Unlocked: The clock PLL is malfunctioning. Return to Symmetricom for service. See 

.

Locked: The GPS receiver is receiving a sufficient number of valid GPS satellite signals and is 
generating a valid timing solution. 

Unlocked: The GPS receiver is not providing a valid timing solution due to one of the following causes:

•

Insufficient visibility of GPS satellites at the antenna location.

•

Poor GPS satellite signal strength

•

A poorly positioned GPS antenna

•

A broken or disconnected antenna cable

•

An absent or non-functioning GPS receiver card

See “Installing the GPS Antenna” on page 13 for GPS antenna installation guidelines.

Locked: The DAC, which disciplines the clock oscillator to the reference source, is operating nominally.

Unlocked: The DAC is operating out of specifications. Return to Symmetricom for service. See 

Time Error issues an alarm when the worst case time error (

) of the XL-

GPS system clock exceeds the user-set Time Threshold.