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OC3port Plus
Users Manual
4-20
Table 4-4. Alarms Transmitted by the OC3port Plus
Alarm
Action Performed When You Select ON
Section LOS
Forces the transmission bit stream to all zeros, which causes
transmission to stop.
Line AIS
Sets all bits in the SONET STS-3c frame to logic 1 prior to scrambling.
Line FERF
Transmits a binary value of ‘110’ in bit positions 6, 7 and 8 of the STS-
3c K2 byte.
Path AIS
Overwrites the SPE and Pointer bytes H1, H2, and H3 with ones.
Path FERF
Sets the G1-FEBE field to a binary value of ‘1001’.
Turning Off an Alarm
To turn off an alarm, do the following:
1.
Press the
ALARMS
key. The
ALARM SELECTION
menu displays.
2.
Press the
Down Arrow
key to move the alarm you want to turn off to the
selection line.
3.
Press the
Left
or
Right Arrow
key to select the
OFF
setting for any of the alarms
on this menu. See Table 5-4 for a complete list and description of SONET
alarms.
The alarm you select is immediately turned off.
Viewing Alarms Stored in the Alarm Log
The OC3port Plus keeps a history of the alarms received in an alarm log. The
tester can store as many as 128 alarms in this log along with such information as
the type of alarm, the date the alarm was received, the starting and ending times of
the alarm, and the duration of the alarm.
This section shows you how to access the alarm log and the type of information
the tester maintains on the alarms in the log. It also shows you how to remove all
the alarms from the alarm log.
To view alarms stored in the alarm log, follow these steps:
1. Press the
ALARMS
key. The
ALARM SELECTIONS
menu is displayed.
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