IP Server 900 Programming Manual Function 7: Reports
J.4
Function 7123: Alarm history report
Provides a log of the last 128 physical alarm layers for each PRI span in the system.
To print an alarm history report, press 1 and press # to confirm.
T1/PRI ALRM HIST
PRESS 1
Here is a sample of output from a Function 7123 alarm history report:
=== Alarm history log === 10/22/2010 8:00 AM
Date Time Port Card Alarm type
=--------- -------- --------- ----------
9/21/2010 1:14 AM 1 Red
9/21/2010 1:22 AM 1 Alarm clear
10/13/2010 2:14 PM 14 Blue
10/13/2010 2:14 PM 14 Alarm clear
10/21/2010 3:14 PM 3 Yellow
10/21/2010 3:15 PM 3 Alarm clear
Alarm types
• Red alarm
— LOS (loss of signal)
• No incoming signal.
• Commonly caused by disconnected cable
— LOF (loss of framing)
• No synchronization
— Wrong framing format (SF vs. ESF)
— Wrong line code (AMI vs. B8ZS)
• Blue alarm
— AIS (alarm indication signal)
• No incoming signal is detected; CSU or equipment sends all 1s to the network when
his occurs
• ESI DLCs don’t generate blue alarms
• Yellow alarm
— RAI (remote alarm indication)
• Sent by the network (remote end); network either isn’t receiving a signal or is unable
to synchronize
• However, equipment (local end) is receiving a signal (because it’s getting the
yellow-alarm message)
• Two main culprits here are LBO and clocking
To Next Page
Loading...
