4-8 61204659L1-1A
Section 4, Status MX2800 STS-1 User Manual
Acknowledge Alarms (ACO)
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 provided in Table 4-10.
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 provided in Table 4-11.
6. ACKNOWLEDGE ALARMS (ACO)
This selection allows an active alarm to be acknowledged, which results in the deactivation of the alarm
relays and an indication of the acknowledgment by the alarm (
ALM) LED. It is the software equivalent of
the ACO button (described in the section ACO Buttons on page 2-13).
Table 4-10. PRI External Clock Alarms
Condition Description
Disabled The selected clock has been disabled by the user and will not be used.
Normal The clock source is currently being used as the timing reference.
Available The clock source is available to be used as a timing source if a failure of the cur-
rent source occurs.
LOS/AIS The clock source is not valid due to an LOS or AIS condition.
Fail An internal hardware failure on the unit prevents the clock source from being
used.
Unavailable The user has specified a T1/E1 port to be used as an external clock source, but
the port has not been enabled.
Table 4-11. SEC External Clock Alarms
Condition Description
Disabled The selected clock has been disabled by the user and will not be used.
Normal The clock source is currently being used as the timing reference.
Available The clock source is available to be used as a timing source if a failure of the cur-
rent source occurs.
LOS/AIS The clock source is not valid due to an LOS or AIS condition.
Fail An internal hardware failure on the unit prevents the clock source from being
used.
Unavailable A T1/E1 port is specified to be used as an external clock source, but the port has
not been enabled.
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