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150-319-205-05, Issue 5
S
S
YSTEM
ETTINGS
The options set from the System Settings screen are the same as the options set through the ELU-319 List 5E and
List 6E front panel Mode and SEL buttons (except for Margin Alarm Threshold, which can only be set at this
screen). Refer to
Table 15 on page 29
Press
from the Maintenance Terminal Main Menu to open the System Settings screen
C
TIME: 12:46:06
DATE: 01/24/00
A. POWER...........: AUTO
B. BER ALARM THRESH: NONE
C. LOOPBACK TIMEOUT: 60
F. ALARM...........: DISABLED
G. MARGIN ALARM THRESH: 4
(C)onfirm
To change any option:
1
Enter the character key, which is shown inside the parenthesis within each parameter description. This causes
the screen to refresh with the new settings.
2
After all parameters have been selected, press
are now activated.
BER Options
The BER option uses the BPV/CRC Total Error Count (TEC) to generate an Alarm if enabled. The ELU combines
the one second TEC counts in both directions for the last 60 seconds. It uses this 1-minute Total System Error
Count (TSEC) to generate an alarm if it exceeds the selected BER threshold of (1E-6 or 1E-7) as follows:
•
BER option = 1E-6. Alarm is generated if TSEC > 92.
•
BER option = 1E-7. Alarm is generated if TSEC > 9.
Once initiated, the alarm clears when the TSEC drops below its associated threshold count. For dribbling type of
errors, the alarm can come and go in intervals as short as 1 second. Alarms due to bursty impulse noise transients
usually require the full 60 seconds or longer to clear depending on the frequency of the transients. This BER option
is always present in any line unit circuit since it is independent of the versions of the other HiGain modules in the
circuit. When connected to an ERU, only the BPVs detected by the ELU are included in the TBC. The BPVs at
the ERU are not counted.
ELU-319 List 5E and List 6E
for a listing of system setting options.
SYSTEM SETTINGS
CIRCUIT ID#:
(D)efaults, (E)xit
Enter the option letter to change setting
Figure 12. System Settings Screen
to exit, then
E
January 26, 2000
(Figure
to confirm. The newly selected parameters
C
Maintenance
12).
27
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