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* These alarms appear on the status line. Because they indicate current
status, they may have cleared by the time you go from the PMC-100's Scan
Network Elements screen to the 551 reporting the alarm.
Interval
The displayed time interval indicates the number of hours (nn Hrs) and
minutes (nn Mins) since the CSU has been powered up or reset, or since
the alarms have been cleared.
Network Loss Of Signal
A Loss of Signal (LOS) event occurs when the CSU senses an absence of
network signal. A signal with loss greater than 28.5 dB for longer than
150 milliseconds is considered no signal. The status line NNS indicator
and front panel NS indicator reflect the current status of the network
signal condition.
Network Out Of Frame
An Out Of Frame (OOF) event occurs when the CSU misses two out of five
network framing bits.
Network Received Yellow
This is a count of the number of times the CSU receives a Yellow alarm
from the network (the counter increments only when the alarm is re-
moved). The status line YEL indicator reflects whether the CSU is receiv-
ing a Yellow alarm.
ALARM COUNTS
SYN NNS YEL AIS NLB BPV CRC
.
.
.
.
.
Interval:
0 Hrs
Network
Loss Of Signal
Out Of Frame
Received Yellow
Alarm Indication
Failed Signal State:
Controlled Slips
Bipolar Violations :
CRC Errors
DTE
Loss Of Signal
Loss Of Sync
Excessive Zeros
Low Average Density:
I
Initialize Counters
E
Exit
Select Option
:
FIGURE 3-9. ALARM COUNTS SCREEN
OPERATION
DD-MMM-YY HH:MM
TSY TNS O'S LAD
.
.
.
.
.
O Mins
Count
:
0
:
0
:
0
:
0
0
:
0
0
:
0
:
0
:
0
:
0
0
CSU : ***
3-15
LT
ST
RT
LOR
.
.
.
.
.
NETWORK ALARM COUNTS
EQUIPMENT ALARM COUNTS
NOTE: SHADED ITEMS ARE NOT
SHOWN IN UNFRAMED MODE.
DS0LB
.
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