ADTRAN 4200659L1 - Manual (Page 99)

Chapter 4. Status
61200659L1-1 MX2800 STS-1 User Manual 4-9
• H OLDOVER – indicates that a failure in the selected clock sourc
has occurred and the unit has entered hold-over mode. In this
mode, the last known good clock reference frequency will be
held within 4.1 ppm for a minimum of 24 hours.
PRI Ext. Clock
The PRI EXT Clock alarms indicate when a failure condition is
encountered on the PRImary clock source (if configured). The
possible values for this alarm are:
• D ISABLED – indicates that the selected clock has been disabled
by the user and will not be used.
• N ORMAL – indicates that the clock source is currently being
used a the timing reference.
• A VAILABLE – indicates that the clock source is available to be
used as a timing source if a failure of the current source occurs.
• LOS/AIS – indicates that the clock source is not valid due to an
LOS or AIS condition.
• F AIL – indicates that an internal hardware failure on the unit
prevents the clock source from being used.
• U NAVAILABLE – indicates that the user has specified a T1/E1
port to be used as an external clock source, but the port has not
been enabled.
SEC Ext. Clock
The SEC EXT Clock alarms indicate when a failure condition is
encountered on the SECondary clock source (if configured). The
possible values for this alarm are:
• D ISABLED – indicates that the selected clock has been disabled
by the user and will not be used.
• N ORMAL – indicates that the clock source is currently being
used a the timing reference.
• A VAILABLE – indicates that the clock source is available to be
used as a timing source if a failure of the current source occurs.