Chapter 4. Status

•HOLDOVER – 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:

•DISABLED – indicates that the selected clock has been disabled by the user and will not be used.

•NORMAL – indicates that the clock source is currently being used a the timing reference.

•AVAILABLE – 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.

•FAIL – indicates that an internal hardware failure on the unit prevents the clock source from being used.

•UNAVAILABLE – 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:

•DISABLED – indicates that the selected clock has been disabled by the user and will not be used.

•NORMAL – indicates that the clock source is currently being used a the timing reference.

•AVAILABLE – indicates that the clock source is available to be used as a timing source if a failure of the current source occurs.

61200659L1-1

MX2800 STS-1 User Manual

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ADTRAN 4200659L8, 4200659L1, 4175043L2, 4200659L5, 4200659L2, 4200659L7, 4200659L3, 4200659L6 PRI Ext. Clock, SEC Ext. Clock
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1200287L1, 1200291L1, 1200657L2, 4200659L4, 4200659L6 specifications

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